Fix dashboard registration to use the real Lovelace API (P1-P3)

P1: The registration was a silent no-op in production — it read
hass.data["lovelace"].dashboards as the DashboardsCollection and
awaited a sync async_items(), and passed "strategy"/"mode" keys the
real create schema rejects. Per the real lovelace source
(components/lovelace/__init__.py, _create_map_dashboard): the metadata
collection lives at hass.data["lovelace"]["dashboards_collection"],
async_items() is a SYNC @callback, the create payload carries metadata
only (url_path/title/icon/show_in_sidebar/allow_single_word), and the
dashboard CONFIG (the strategy reference) is saved as a SECOND step
through the content manager registered under
hass.data["lovelace"]["dashboards"][url_path]. The strategy is saved
only for a dashboard created in this run (or whose config already
carries ours); an existing dashboard skips both steps, so a user's
dashboard config is never overwritten. Collection unavailable / save
raising still warns and continues, never crashing setup.

P2: Declare "lovelace" in manifest.json dependencies (alongside
frontend/http) so hass.data["lovelace"] is populated before setup
instead of relying on boot order.

P3: Guard the check-then-create with a per-hass asyncio.Lock so two
concurrent entry setups cannot both pass the exists-check and race on
the url_path create. Per-hass (attribute on the hass object) rather
than a bare module-level lock, which binds to the first event loop
that awaits it.

The lifecycle tests' fake is rebuilt to mirror the real API shape
(sync async_items, async async_create_item, a dashboards content-
manager dict whose entries expose async async_save), with assertions
that the strategy config was saved with the custom:nestquest-party
type, that a user's existing config is not overwritten, that a failing
save still leaves setup green, and that concurrent registrations
create the dashboard exactly once (verified to fail without the
guard).

README.md

@@ -174,8 +174,23 @@ is simply a Home Assistant client.
    Assistant user it may also reach other permitted Home Assistant entities
    and services.
 
-2. **Build a dashboard with only the NestQuest panel cards.** Create a
+2. **Build a dashboard with only the NestQuest panel cards.** The
-   Lovelace dashboard whose **URL slug is `nestquest`** (Settings →
+   recommended path is the **zero-config dashboard strategy**: create a
+   Lovelace dashboard whose URL slug is `nestquest` with
+
+   ```yaml
+   strategy:
+     type: custom:nestquest-party
+   ```
+
+   and no views of your own — the strategy generates the party-board and
+   quest-log views (each already in Panel layout) from the household
+   roster at render time. Optional `url_path` and `weather_entity` keys
+   may sit beside `strategy:`. The manual instructions below describe
+   building the two views by hand if you prefer not to use the strategy.
+
+   **Manual alternative:** create a Lovelace dashboard whose **URL slug
+   is `nestquest`** (Settings →
    Dashboards → Edit → URL slug). A functional panel needs **two** views
    in that dashboard, each with its own card config from
    `design/ENTITIES-AND-SERVICES.md` §4. Give the views these exact URL

custom_components/nestquest/__init__.py

@@ -5,7 +5,8 @@ SQLite file, the migrations, and every business rule.  Setup builds the
 entry's ONE shared API client, the coordinator that polls the panel
 snapshot through it, and the SSE subscription that re-fires the API's
 transition frames on the HA bus, registers the single
-``nestquest.complete_quest`` proxy service, and forwards the sensor and
+``nestquest.complete_quest`` proxy service, registers the zero-config
+panel dashboard (Feature 20), and forwards the sensor and
 binary_sensor platforms.
 """
 from __future__ import annotations
@@ -29,6 +30,7 @@ from .const import (
     PLATFORMS,
 )
 from .coordinator import NestQuestCoordinator, coordinator_client_from_entry
+from .dashboard import async_register_dashboard
 from .frontend import async_register_frontend
 from .services import async_deregister_services, async_register_services
 from .sse import NestQuestEventStream
@@ -87,6 +89,13 @@ async def async_setup(hass: HomeAssistant, config: dict[str, Any]) -> bool:
 async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     """Set up NestQuest from a config entry."""
     await async_register_frontend(hass)
+    # The zero-config panel dashboard (Feature 20): register the
+    # storage-mode strategy dashboard if no dashboard under the stable
+    # url_path exists yet.  Unavailability of the Lovelace dashboards
+    # collection (YAML mode, lovelace not loaded) logs a warning and
+    # NEVER fails setup; an existing dashboard — ours or the user's —
+    # is left untouched, so a reload cannot duplicate it.
+    await async_register_dashboard(hass)
     hass.data.setdefault(DOMAIN, {})
 
     async def _async_update_listener(

custom_components/nestquest/core/const.py

@@ -43,6 +43,18 @@ DOMAIN_SERVICES: tuple[str, ...] = (
 
 SQLITE_DB_FILENAME = "nestquest.db"
 
+# Zero-config panel dashboard (Feature 20): ONE storage-mode Lovelace
+# dashboard registered on setup whose config carries the bundle's
+# ``custom:nestquest-party`` strategy (frontend/src/strategy.ts) — the
+# views are generated at render time from the household roster.  The
+# url_path IS the domain: the stable key idempotency is keyed on (a
+# reload or a second entry never duplicates it, and a dashboard already
+# registered under it — ours or the user's — is left untouched).
+DASHBOARD_URL_PATH = DOMAIN
+DASHBOARD_TITLE = "NestQuest"
+DASHBOARD_ICON = "mdi:party-popper"
+DASHBOARD_STRATEGY_TYPE = "custom:nestquest-party"
+
 # Configuration keys and default values
 CONF_HORIZON_DAYS = "horizon_days"
 DEFAULT_HORIZON_DAYS = 14

custom_components/nestquest/dashboard.py

@@ -0,0 +1,215 @@
+"""Zero-config panel dashboard registration for NestQuest (Feature 20).
+
+On setup the integration registers ONE storage-mode Lovelace dashboard
+whose CONFIG uses the bundle's ``custom:nestquest-party`` strategy (see
+``frontend/src/strategy.ts``): the views themselves are GENERATED at
+render time from the household roster, so the stored dashboard config
+carries nothing but the strategy reference.
+
+Registration mirrors the REAL two-step sequence the lovelace
+integration itself uses when it creates the onboarding map dashboard
+(``homeassistant/components/lovelace/__init__.py``,
+``_create_map_dashboard``):
+
+1. create the dashboard METADATA through the ``DashboardsCollection``
+   (``hass.data["lovelace"]["dashboards_collection"]``) — url_path,
+   title, icon, sidebar visibility.  The strategy reference is NOT part
+   of the create payload: the collection's create schema allows only
+   the metadata fields, so a ``strategy`` key there fails the whole
+   create (this was the silent no-op the first implementation shipped).
+2. save the dashboard CONFIG — ``{"strategy": ...}`` — through the
+   per-url_path CONTENT manager that the collection's change listener
+   registers under ``hass.data["lovelace"]["dashboards"][url_path]``
+   (a ``LovelaceStorage``), exactly the second step HA performs.
+
+Registration is IDEMPOTENT — a dashboard already under the stable
+``url_path`` (ours or a user's) skips BOTH steps and its stored config
+is never overwritten — and the Lovelace surfaces being unavailable
+(YAML mode, lovelace not loaded) is a logged warning, never a setup
+failure.
+"""
+from __future__ import annotations
+
+import asyncio
+
+from homeassistant.core import HomeAssistant
+
+from .const import (
+    DASHBOARD_ICON,
+    DASHBOARD_STRATEGY_TYPE,
+    DASHBOARD_TITLE,
+    DASHBOARD_URL_PATH,
+    LOGGER,
+)
+
+_LOGGER = LOGGER
+
+# Single-flight guard for the check-then-create below: HA can set up
+# several config entries CONCURRENTLY, and two overlapping setups would
+# both pass the exists-check and race on the url_path create.  The lock
+# is per hass instance (kept as an attribute on the hass object, since
+# hass.data is the integrations' shared registry the unload path
+# empties) rather than one module-level asyncio.Lock — a bare
+# module-level lock binds to whichever event loop first awaits it and
+# raises RuntimeError on any other loop, while the race it must prevent
+# only exists between setups running on the SAME hass anyway.
+_REGISTRATION_LOCK_ATTR = "_nestquest_dashboard_registration_lock"
+
+
+def _registration_lock(hass: HomeAssistant) -> asyncio.Lock:
+    """Return the per-hass registration lock, creating it on first use."""
+    lock = getattr(hass, _REGISTRATION_LOCK_ATTR, None)
+    if lock is None:
+        lock = asyncio.Lock()
+        setattr(hass, _REGISTRATION_LOCK_ATTR, lock)
+    return lock
+
+
+def _lovelace_data(hass: HomeAssistant) -> dict | None:
+    """Return ``hass.data["lovelace"]`` when it is the real dict shape.
+
+    The lovelace integration stores a plain DICT of surfaces (``mode``,
+    ``dashboards``, ``dashboards_collection``, ``resources``,
+    ``yaml_dashboards``) under the ``lovelace`` key; anything else
+    (missing key, unexpected object) means the surfaces below cannot be
+    reached and registration must warn and continue.
+    """
+    lovelace_data = hass.data.get("lovelace")
+    if not isinstance(lovelace_data, dict):
+        return None
+    return lovelace_data
+
+
+def _dashboards_collection(hass: HomeAssistant):
+    """Return the Lovelace dashboards METADATA collection, or None.
+
+    The collection lives at ``hass.data["lovelace"]
+    ["dashboards_collection"]`` — NOT under ``["dashboards"]``, which
+    maps url_path to the per-dashboard CONTENT managers
+    (``LovelaceStorage``/``LovelaceYAML``).  A missing key (lovelace
+    not loaded) and a missing/None entry (YAML mode never sets the
+    collection) both mean "cannot create storage dashboards here" —
+    callers log and continue.  The presence of the surface is verified
+    by capability (``async_create_item`` callable), not by type, so no
+    lovelace import is needed.
+    """
+    lovelace_data = _lovelace_data(hass)
+    if lovelace_data is None:
+        return None
+    collection = lovelace_data.get("dashboards_collection")
+    if collection is None or not callable(
+        getattr(collection, "async_create_item", None)
+    ):
+        return None
+    return collection
+
+
+def _dashboard_store(hass: HomeAssistant, url_path: str):
+    """Return a url_path's dashboard CONTENT manager, or None.
+
+    After a metadata create, the collection's change listener registers
+    a ``LovelaceStorage`` for the new dashboard under
+    ``hass.data["lovelace"]["dashboards"][url_path]``; the dashboard
+    CONFIG (the strategy reference) is saved through THAT manager —
+    the second step of HA's own dashboard creation.
+    """
+    lovelace_data = _lovelace_data(hass)
+    if lovelace_data is None:
+        return None
+    dashboards = lovelace_data.get("dashboards")
+    if not isinstance(dashboards, dict):
+        return None
+    store = dashboards.get(url_path)
+    if store is None or not callable(getattr(store, "async_save", None)):
+        return None
+    return store
+
+
+def _item_url_path(item) -> str | None:
+    """Read a dashboard item's ``url_path`` through either access shape.
+
+    The collection hands back storage items as dicts while builtin
+    dashboards come back as config objects; the url_path is reachable
+    through ``item["url_path"]`` or ``item.url_path`` respectively.
+    """
+    url_path = getattr(item, "url_path", None)
+    if isinstance(url_path, str):
+        return url_path
+    get_url_path = getattr(item, "get", None)
+    if callable(get_url_path):
+        value = get_url_path("url_path")
+        if isinstance(value, str):
+            return value
+    return None
+
+
+def _existing_dashboard(items) -> bool:
+    """Whether a dashboard under the stable url_path already exists."""
+    return any(_item_url_path(item) == DASHBOARD_URL_PATH for item in items)
+
+
+async def async_register_dashboard(hass: HomeAssistant) -> bool:
+    """Register the NestQuest panel dashboard exactly once.
+
+    Returns True when a dashboard under the stable ``url_path`` exists
+    after the call (pre-existing or created here), False when the
+    Lovelace surfaces were unavailable or refused.  A dashboard already
+    registered under the stable ``url_path`` — whether ours from a
+    previous setup or a user's own — skips BOTH steps and is left
+    COMPLETELY alone: its stored config is never overwritten, it is
+    never deleted, never a duplicate.  The strategy config is saved
+    ONLY for the dashboard created in THIS call, whose fresh content
+    store is empty, so the save cannot clobber anything.
+    """
+    collection = _dashboards_collection(hass)
+    if collection is None:
+        _LOGGER.warning(
+            "Lovelace dashboards collection unavailable; the NestQuest "
+            "panel dashboard was not registered. Enable the Lovelace "
+            "integration in storage mode or create a dashboard with "
+            "strategy %s manually.",
+            DASHBOARD_STRATEGY_TYPE,
+        )
+        return False
+    try:
+        # Single-flight: two concurrent entry setups must not both pass
+        # the exists-check and race on the url_path create.
+        async with _registration_lock(hass):
+            # async_items() is a SYNC @callback on the real collection
+            # (helpers/collection.py ObservableCollection) — not awaited.
+            if _existing_dashboard(collection.async_items()):
+                return True
+            await collection.async_create_item(
+                {
+                    "url_path": DASHBOARD_URL_PATH,
+                    "title": DASHBOARD_TITLE,
+                    "icon": DASHBOARD_ICON,
+                    "show_in_sidebar": True,
+                    "allow_single_word": True,
+                }
+            )
+            # Step two (mirroring HA's _create_map_dashboard): the
+            # strategy CONFIG goes through the fresh dashboard's
+            # content manager, not through the metadata collection.
+            store = _dashboard_store(hass, DASHBOARD_URL_PATH)
+            if store is None:
+                _LOGGER.warning(
+                    "The NestQuest panel dashboard was registered but its "
+                    "Lovelace content manager never appeared; add the "
+                    "strategy %s to the dashboard manually.",
+                    DASHBOARD_STRATEGY_TYPE,
+                )
+                return False
+            await store.async_save(
+                {"strategy": {"type": DASHBOARD_STRATEGY_TYPE}}
+            )
+    except Exception:
+        _LOGGER.warning(
+            "Registering the NestQuest panel dashboard in the Lovelace "
+            "dashboards collection failed; set it up manually with "
+            "strategy %s.",
+            DASHBOARD_STRATEGY_TYPE,
+            exc_info=True,
+        )
+        return False
+    return True

custom_components/nestquest/manifest.json

@@ -7,7 +7,8 @@
   "config_flow": true,
   "dependencies": [
     "frontend",
-    "http"
+    "http",
+    "lovelace"
   ],
   "documentation": "https://github.com/Maniacs-Mansion/NestQuest",
   "integration_type": "hub",

custom_components/nestquest/sensor.py

@@ -21,6 +21,8 @@ missed instances, and ``admin_instances`` includes them (D-009).
 """
 from __future__ import annotations
 
+import re
+import unicodedata
 from collections.abc import Callable, Iterable
 from typing import Any
 
@@ -41,13 +43,18 @@ from .coordinator import (
 )
 from .core.snapshot import instance_payload
 
-#: Home Assistant's state machine refuses states longer than 255
+#: HA's state machine refuses states longer than 255
 #: characters (its hard recorder/state limit).  These sensors' states
 #: are numeric, but the guard is applied uniformly: a payload-bearing
 #: sensor can never crash the state write, and later string-state
 #: sensors reuse the same helper.
 MAX_STATE_LENGTH = 255
 
+#: Entity-id length cap the slug mirror applies: HA truncates the
+#: entity_id (``sensor.`` + slug) at MAX_LENGTH_STATE_ENTITY_ID (64),
+#: so the slugged object id alone may not exceed 64 - len("sensor.").
+_MAX_SLUG_LENGTH = 64 - len("sensor.")
+
 
 def _state_within_limit(state: Any) -> Any:
     """Return ``state`` unchanged, refusing strings over HA's limit.
@@ -98,6 +105,56 @@ def _next_open_quest(
     )
 
 
+def _slugify(text: str) -> str:
+    """Slugify a display name the way Home Assistant derives entity ids.
+
+    Mirrors ``homeassistant.util.slugify`` (the unicode path HA runs
+    entity names through) for accented-Latin names: NFKD-normalize,
+    fold to ASCII (accents drop out with their combining marks),
+    lowercase, and turn every run of non-alphanumerics into one
+    underscore, capped at HA's entity-id length like the registry does.
+    The documented divergence from HA's vendored slugifier is unidecode:
+    HA transliterates any script to ASCII (so e.g. non-Latin names
+    survive), this mirror drops those characters instead, and a name
+    that then slugs to nothing falls through to HA's ``unknown``
+    sentinel — the same answer HA's wrapper gives.  (The harness is
+    mock-only — no real HA to import the helper from — and entity ids
+    are registry identity, so the mirror is deliberate.)
+    """
+    slug = unicodedata.normalize("NFKD", text)
+    slug = slug.encode("ascii", "ignore").decode("ascii")
+    slug = re.sub(r"[^a-z0-9]+", "_", slug.lower()).strip("_")
+    return (slug or "unknown")[:_MAX_SLUG_LENGTH]
+
+
+def _child_roster(children: Iterable[ChildDaySnapshot]) -> list[dict[str, Any]]:
+    """The ordered child roster the panel cards discover children from.
+
+    One entry per ACTIVE child in the snapshot's order (the API's
+    sort_order, then id): ``child_id``, ``name``, and the ``slug`` the
+    entity-id derivation produces for the child's name — the piece the
+    cards need to build ``sensor.nestquest_<slug>_...`` ids.  Duplicate
+    display names get the registry's ``_2``/``_3`` suffix in snapshot
+    order, matching how HA resolves the collision at registration.  The
+    rollups' ``children`` attribute (per-child counts) is unchanged and
+    carries a different shape on purpose.
+    """
+    slugs: dict[str, int] = {}
+    roster: list[dict[str, Any]] = []
+    for child in children:
+        base = _slugify(child.child_name)
+        taken = slugs.get(base, 0) + 1
+        slugs[base] = taken
+        roster.append(
+            {
+                "child_id": child.child_id,
+                "name": child.child_name,
+                "slug": base if taken == 1 else f"{base}_{taken}",
+            }
+        )
+    return roster
+
+
 class _NestQuestChildDaySensor(CoordinatorEntity, SensorEntity):
     """Base for the per-child day sensors.
 
@@ -356,7 +413,12 @@ class _NestQuestHouseholdSensor(CoordinatorEntity, SensorEntity):
 
 
 class NestQuestHouseholdDueTodaySensor(_NestQuestHouseholdSensor):
-    """Total quests due today across active children."""
+    """Total quests due today across active children.
+
+    Also publishes ``child_roster`` (see :func:`_child_roster`): the
+    ordered child identity list the panel cards read to discover the
+    board's children when the card config carries no ``child_order``.
+    """
 
     _attr_name = "NestQuest household quests due today"
     _attr_state_class = SensorStateClass.MEASUREMENT
@@ -380,7 +442,8 @@ class NestQuestHouseholdDueTodaySensor(_NestQuestHouseholdSensor):
             "children": {
                 str(child.child_id): child.due_today
                 for child in data.children
-            }
+            },
+            "child_roster": _child_roster(data.children),
         }
 
 

frontend/package-lock.json

@@ -9,10 +9,197 @@
         "lit": "^3.3.0"
       },
       "devDependencies": {
+        "jsdom": "^30.1.1",
         "typescript": "^5.9.2",
         "vite": "^7.1.5"
       }
     },
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
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+        "@csstools/css-color-parser": "^4.2.3",
+        "@csstools/css-parser-algorithms": "^4.0.0",
+        "@csstools/css-tokenizer": "^4.0.1",
+        "lru-cache": "^11.5.3"
+      },
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+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==",
+      "dev": true,
+      "license": "MIT"
     }
   }
 }

frontend/package.json

@@ -9,6 +9,7 @@
     "lit": "^3.3.0"
   },
   "devDependencies": {
+    "jsdom": "^30.1.1",
     "typescript": "^5.9.2",
     "vite": "^7.1.5"
   }

frontend/src/cards/party-board.ts

@@ -143,6 +143,16 @@ function asNumber(value: unknown, fallback: number): number {
   return Number.isFinite(parsed) ? parsed : fallback;
 }
 
+/** The slug a discovered roster entry carries, or "" when the entry is
+ *  not an object with a non-empty slug string. */
+function asRosterSlug(entry: unknown): string {
+  if (entry === null || typeof entry !== "object" || Array.isArray(entry)) {
+    return "";
+  }
+  const slug = (entry as Record<string, unknown>).slug;
+  return typeof slug === "string" ? slug.trim() : "";
+}
+
 function clampPercent(value: number): number {
   if (!Number.isFinite(value)) {
     return 0;
@@ -892,15 +902,34 @@ export class NestQuestPartyBoardCard extends LitElement {
       return [];
     }
     const order = this._config.child_order;
-    if (!Array.isArray(order)) {
+    if (Array.isArray(order)) {
+      return order
+        .filter(
+          (entry): entry is string =>
+            typeof entry === "string" && entry.trim().length > 0
+        )
+        .map((entry) => entry.trim());
+    }
+    return this._discoveredChildSlugs();
+  }
+
+  /** Zero-config discovery (Feature 20): the ordered child roster the
+   *  integration publishes on the household rollup
+   *  (custom_components/nestquest/sensor.py — ``child_roster``, the
+   *  snapshot's sort_order, then id), each entry carrying the slug the
+   *  per-child entity ids are built from.  Consulted only when the
+   *  config has no child_order — explicit configuration wins. */
+  private _discoveredChildSlugs(): string[] {
+    const household = this._state(
+      "sensor.nestquest_household_quests_due_today"
+    );
+    const roster = household?.attributes?.child_roster;
+    if (!Array.isArray(roster)) {
       return [];
     }
-    return order
+    return roster
-      .filter(
+      .map((entry) => asRosterSlug(entry))
-        (entry): entry is string =>
+      .filter((slug) => slug.length > 0);
-          typeof entry === "string" && entry.trim().length > 0
-      )
-      .map((entry) => entry.trim());
   }
 
   private _plates(): ChildPlate[] {

frontend/src/nestquest-cards.ts

@@ -1,6 +1,7 @@
 import "./cards/party-board";
 import "./cards/quest-log";
 import "./cards/admin";
+import "./strategy";
 
 const FONTS_HREF = "/nestquest-static/nestquest-fonts.css";
 if (!document.querySelector('link[data-nq-fonts=""]')) {

frontend/src/strategy.ts

@@ -0,0 +1,161 @@
+import type { HassLike } from "./types";
+
+type StateObject = {
+  state: unknown;
+  attributes?: Record<string, unknown> | null;
+};
+
+type RosterEntry = {
+  name: string;
+  slug: string;
+};
+
+type View = {
+  path?: string;
+  title?: string;
+  type: string;
+  cards: Record<string, unknown>[];
+};
+
+type LovelaceConfig = {
+  views: View[];
+};
+
+type StrategyConfig = Record<string, unknown>;
+
+type StrategyClass = {
+  generate: (
+    config: StrategyConfig,
+    hass: HassLike | undefined
+  ) => Promise<LovelaceConfig>;
+};
+
+declare global {
+  interface Window {
+    customStrategies?: Record<string, StrategyClass>;
+  }
+}
+
+function asString(value: unknown): string {
+  return typeof value === "string" ? value.trim() : "";
+}
+
+/** The slug a discovered roster entry carries, or "" when the entry is
+ *  not an object with a non-empty slug string — the same shape check
+ *  the party board applies to the same attribute. */
+function asRosterSlug(entry: unknown): string {
+  if (entry === null || typeof entry !== "object" || Array.isArray(entry)) {
+    return "";
+  }
+  const slug = (entry as Record<string, unknown>).slug;
+  return typeof slug === "string" ? slug.trim() : "";
+}
+
+/** The dashboard's URL path segment, used to COMPUTE the card paths the
+ *  navigation needs.  A dashboard lives at a single top-level segment
+ *  (/<url_path>), so the first pathname segment is the dashboard root —
+ *  this is where the strategy renders, and navigating back to it shows
+ *  the first view (the party board).  An explicit ``url_path`` in the
+ *  strategy configuration wins for setups that need to pin it. */
+function dashboardUrlPath(config: StrategyConfig): string {
+  const configured = asString(config.url_path).replace(/^\/+|\/+$/g, "");
+  if (configured) {
+    return configured;
+  }
+  const segment = window.location.pathname.split("/").filter(Boolean)[0];
+  return segment ?? "";
+}
+
+/** The display name a roster entry carries, or "" when it is not a
+ *  non-empty string — the roster's ``name`` field (sensor.py
+ *  ``_child_roster``), used for the quest-log view titles. */
+function asRosterName(entry: unknown): string {
+  if (entry === null || typeof entry !== "object" || Array.isArray(entry)) {
+    return "";
+  }
+  const name = (entry as Record<string, unknown>).name;
+  return typeof name === "string" ? name.trim() : "";
+}
+
+/** The ordered child roster the integration publishes on the household
+ *  rollup (custom_components/nestquest/sensor.py — ``child_roster``,
+ *  the snapshot's sort_order, then id).  The same source the party
+ *  board's plate discovery reads, consumed here at render time so the
+ *  quest-log views exist for exactly the active children. */
+function rosterEntries(hass: HassLike | undefined): RosterEntry[] {
+  const states = hass?.states as Record<string, StateObject> | undefined;
+  const household = states?.["sensor.nestquest_household_quests_due_today"];
+  const roster = household?.attributes?.child_roster;
+  if (!Array.isArray(roster)) {
+    return [];
+  }
+  return roster
+    .map((entry) => ({ slug: asRosterSlug(entry), name: asRosterName(entry) }))
+    .filter((entry) => entry.slug.length > 0);
+}
+
+/**
+ * Zero-config NestQuest dashboard strategy (Feature 20).
+ *
+ * A dashboard configured with ``strategy: { type: custom:nestquest-party }``
+ * gets its views GENERATED at render time from the household roster: one
+ * party-board view (the dashboard root) and one quest-log view per child,
+ * ordered by the roster's sort_order.  The paths the cards navigate by are
+ * COMPUTED, not configured:
+ *
+ * - the board's ``quest_log_path`` is the dashboard root; tapping a crest
+ *   pushes ``<root>/<slug>`` (party-board.ts ``_openQuestLog``);
+ * - each log view's ``path`` IS the child's slug, so the log resolves its
+ *   child from the last pathname segment (quest-log.ts
+ *   ``childSlugFromPath``) and its ``board_path`` back to the dashboard
+ *   root (quest-log.ts ``_returnToBoard``).
+ *
+ * With zero children the board view still renders — the board card shows
+ * its own "not set up yet" notice for an empty roster, so no log views are
+ * needed.  ``url_path`` and ``weather_entity`` may still be set explicitly
+ * in the strategy configuration; everything else is derived.
+ */
+export class NestQuestPartyStrategy {
+  static async generate(
+    config: StrategyConfig,
+    hass: HassLike | undefined
+  ): Promise<LovelaceConfig> {
+    const root = `/${dashboardUrlPath(config)}`;
+    const weatherEntity = asString(config.weather_entity);
+    const boardCard: Record<string, unknown> = {
+      type: "custom:nestquest-party-board-card",
+      quest_log_path: root,
+    };
+    if (weatherEntity) {
+      boardCard.weather_entity = weatherEntity;
+    }
+    const logCard: Record<string, unknown> = {
+      type: "custom:nestquest-quest-log-card",
+      board_path: root,
+    };
+    if (weatherEntity) {
+      logCard.weather_entity = weatherEntity;
+    }
+    return {
+      views: [
+        {
+          path: "party",
+          title: "The Party",
+          type: "panel",
+          cards: [boardCard],
+        },
+        ...rosterEntries(hass).map<View>((entry) => ({
+          path: entry.slug,
+          title: entry.name
+            ? `${entry.name}'s Quest Log`
+            : `${entry.slug}'s Quest Log`,
+          type: "panel",
+          cards: [{ ...logCard }],
+        })),
+      ],
+    };
+  }
+}
+
+window.customStrategies = window.customStrategies ?? {};
+window.customStrategies["nestquest-party"] = NestQuestPartyStrategy;

frontend/tests/render-party-board.mjs

@@ -0,0 +1,56 @@
+/**
+ * Render the built party-board card under jsdom and print its plates.
+ *
+ * Usage: node render-party-board.mjs < spec.json
+ *
+ * The spec JSON carries {bundle, tag, config, hass}; stdout receives one JSON
+ * object {plates, html} where plates is the ordered plate list the shadow DOM
+ * renders (name + present/away/unknown kind). The Python panel tests drive
+ * this harness so the assertions run against the exact bundle HACS ships.
+ */
+import { readFileSync } from "node:fs";
+import { pathToFileURL } from "node:url";
+import { JSDOM } from "jsdom";
+
+const spec = JSON.parse(readFileSync(0, "utf8"));
+
+const dom = new JSDOM("<!doctype html><html><body></body></html>", {
+  url: "http://homeassistant.local/nestquest/board",
+  pretendToBeVisual: true,
+});
+
+// Expose the jsdom globals the Lit bundle expects. Node's own intrinsics
+// (Object, Array, ...) are kept — only what globalThis lacks is copied.
+for (const key of Object.getOwnPropertyNames(dom.window)) {
+  if (!(key in globalThis)) {
+    try {
+      globalThis[key] = dom.window[key];
+    } catch {
+      // jsdom getters may throw on access; the card does not need them.
+    }
+  }
+}
+globalThis.window = dom.window;
+
+await import(pathToFileURL(spec.bundle).href);
+
+const element = document.createElement(spec.tag);
+element.setConfig(spec.config);
+element.hass = spec.hass;
+document.body.appendChild(element);
+await element.updateComplete;
+
+const plates = [
+  ...element.shadowRoot.querySelectorAll(".plates .plate"),
+].map((plate) => ({
+  name: plate.querySelector(".name")?.textContent?.trim() ?? "",
+  kind: plate.classList.contains("unknown")
+    ? "unknown"
+    : plate.classList.contains("away")
+      ? "away"
+      : "present",
+}));
+
+const payload = JSON.stringify({ plates, html: element.shadowRoot.innerHTML });
+await new Promise((resolve) => process.stdout.write(payload, () => resolve()));
+process.exit(0);

frontend/tests/render-strategy.mjs

@@ -0,0 +1,48 @@
+/**
+ * Import the built bundle into jsdom and generate the dashboard strategy's
+ * views.
+ *
+ * Usage: node render-strategy.mjs < spec.json
+ *
+ * The spec JSON carries {bundle, url, config, hass}; stdout receives one
+ * JSON object {views} — the strategy output's views array with the paths
+ * and card configs the generated dashboard renders.  The Python panel
+ * tests drive this harness so the assertions run against the exact bundle
+ * HACS ships.
+ */
+import { readFileSync } from "node:fs";
+import { pathToFileURL } from "node:url";
+import { JSDOM } from "jsdom";
+
+const spec = JSON.parse(readFileSync(0, "utf8"));
+
+const dom = new JSDOM("<!doctype html><html><body></body></html>", {
+  url: spec.url ?? "http://homeassistant.local/nestquest/party",
+  pretendToBeVisual: true,
+});
+
+// Expose the jsdom globals the Lit bundle expects. Node's own intrinsics
+// (Object, Array, ...) are kept — only what globalThis lacks is copied.
+for (const key of Object.getOwnPropertyNames(dom.window)) {
+  if (!(key in globalThis)) {
+    try {
+      globalThis[key] = dom.window[key];
+    } catch {
+      // jsdom getters may throw on access; the strategy does not need them.
+    }
+  }
+}
+globalThis.window = dom.window;
+
+await import(pathToFileURL(spec.bundle).href);
+
+const strategy = window.customStrategies?.["nestquest-party"];
+if (!strategy) {
+  console.error("nestquest-party strategy is not registered on the bundle");
+  process.exit(1);
+}
+
+const lovelace = await strategy.generate(spec.config, spec.hass);
+const payload = JSON.stringify({ views: lovelace.views });
+await new Promise((resolve) => process.stdout.write(payload, () => resolve()));
+process.exit(0);

tests/test_lifecycle.py

@@ -12,12 +12,100 @@ from custom_components.nestquest.const import (
     DOMAIN as DOMAIN_CONST,
     SERVICE_COMPLETE_QUEST,
 )
+from custom_components.nestquest.dashboard import (
+    DASHBOARD_STRATEGY_TYPE,
+    DASHBOARD_URL_PATH,
+    async_register_dashboard,
+)
 
 
 def _wire(entry, registry):
     return wire_entry_to_registry(entry, registry)
 
 
+class FakeDashboardStore:
+    """Stand-in for a per-dashboard CONTENT manager (LovelaceStorage).
+
+    In the real API the dashboard CONFIG (the strategy reference) is
+    saved through THIS manager's ``async_save``, NOT through the
+    metadata collection — so every strategy-save assertion reads here.
+    """
+
+    def __init__(self) -> None:
+        self.saved: list[dict] = []
+        self.config: dict | None = None
+
+    async def async_save(self, config: dict) -> None:
+        self.saved.append(dict(config))
+        self.config = dict(config)
+
+
+class FakeDashboardsCollection:
+    """Stand-in mirroring the REAL Lovelace dashboards API shapes.
+
+    Faithful to ``homeassistant/components/lovelace`` +
+    ``helpers/collection.py``: ``async_items()`` is a SYNC ``@callback``
+    (ObservableCollection.async_items returns list(data.values())),
+    ``async_create_item`` IS async, and — mirroring lovelace's
+    ``storage_dashboard_changed`` listener — a successful create
+    registers a fresh CONTENT manager under
+    ``hass.data["lovelace"]["dashboards"][url_path]``, which is where
+    the dashboard config is then saved.  Records ``async_create_item``
+    calls so tests can assert exactly what the setup path registered —
+    and that a reload registers nothing more.
+    """
+
+    def __init__(self, hass, items=None) -> None:
+        self.hass = hass
+        self.items = list(items or [])
+        self.created: list[dict] = []
+        #: url_path -> content manager, mirroring the real listener's
+        # registrations (pre-existing items included).
+        self.stores: dict[str, FakeDashboardStore] = {}
+
+    def async_items(self):
+        """SYNC, like the real ``ObservableCollection.async_items``."""
+        return list(self.items)
+
+    async def async_create_item(self, item_config: dict) -> None:
+        # The real collection awaits validation and change notification
+        # around the item insertion; yield first so two concurrent
+        # callers without a single-flight guard would BOTH get here.
+        await asyncio.sleep(0)
+        self.created.append(dict(item_config))
+        self.items.append(dict(item_config))
+        self.stores[item_config["url_path"]] = FakeDashboardStore()
+        self.hass.data["lovelace"]["dashboards"][item_config["url_path"]] = (
+            self.stores[item_config["url_path"]]
+        )
+
+
+def _install_dashboard_collection(
+    hass, items=None
+) -> FakeDashboardsCollection:
+    """Install the REAL-API-shaped lovelace surfaces on the hass stub.
+
+    Mirrors what lovelace's ``async_setup`` leaves behind in storage
+    mode: ``hass.data["lovelace"]`` is a DICT with the metadata
+    collection under ``dashboards_collection`` and the per-url_path
+    CONTENT managers under ``dashboards``.  Any pre-existing item gets
+    a content manager, exactly as lovelace's change listener would
+    have registered one when the dashboard was created.
+    """
+    collection = FakeDashboardsCollection(hass, items)
+    hass.data["lovelace"] = {
+        "mode": "storage",
+        "dashboards": {},
+        "dashboards_collection": collection,
+    }
+    for item in collection.items:
+        url_path = item.get("url_path")
+        store = FakeDashboardStore()
+        collection.stores[url_path] = store
+        hass.data["lovelace"]["dashboards"][url_path] = store
+    return collection
+
+
 async def test_setup_stores_runtime_data_in_hass_data(hass, make_entry) -> None:
     entry = _wire(make_entry(), hass.registry)
     assert await async_setup_entry(hass, entry) is True
@@ -271,3 +359,161 @@ async def test_unload_shuts_coordinator_even_when_listener_removal_raises() -> N
     assert entry.runtime_data is None
     assert DOMAIN_CONST not in hass.data
     assert hass.time_change.size == 0
+
+
+async def test_setup_creates_the_panel_dashboard(hass, make_entry) -> None:
+    """A fresh install gets the storage-mode strategy dashboard via the
+    REAL two-step Lovelace sequence: the METADATA (url_path, title,
+    icon, sidebar, single-word allowance — nothing else: the real
+    create schema rejects unknown keys like ``strategy``) through the
+    collection, then the dashboard CONFIG (the strategy reference)
+    through the fresh dashboard's content manager."""
+    collection = _install_dashboard_collection(hass)
+    entry = _wire(make_entry(), hass.registry)
+    assert await async_setup_entry(hass, entry) is True
+    # Step 1: the metadata create through the collection.
+    assert len(collection.created) == 1
+    created = collection.created[0]
+    assert created["url_path"] == DASHBOARD_URL_PATH
+    assert created["title"]
+    assert created["show_in_sidebar"] is True
+    assert created["allow_single_word"] is True
+    assert "icon" in created
+    # The create payload carries METADATA only: a ``strategy`` key is
+    # rejected by the real collection's create schema (the silent
+    # no-op the first implementation shipped).
+    assert "strategy" not in created
+    assert "mode" not in created
+    # Step 2: the strategy CONFIG saved through the content manager
+    # the create registered, with the custom strategy type.
+    store = hass.data["lovelace"]["dashboards"][DASHBOARD_URL_PATH]
+    assert store is collection.stores[DASHBOARD_URL_PATH]
+    assert store.saved == [{"strategy": {"type": DASHBOARD_STRATEGY_TYPE}}]
+    assert store.config == {"strategy": {"type": DASHBOARD_STRATEGY_TYPE}}
+
+
+async def test_setup_reload_does_not_duplicate_the_dashboard(
+    hass, make_entry
+) -> None:
+    """A reload (or a second entry) must not create a second dashboard:
+    the one under the stable url_path is reused as-is — BOTH steps are
+    skipped, so the strategy config is not re-saved either."""
+    collection = _install_dashboard_collection(hass)
+    entry = _wire(make_entry(), hass.registry)
+    assert await async_setup_entry(hass, entry) is True
+    assert len(collection.created) == 1
+    store = hass.data["lovelace"]["dashboards"][DASHBOARD_URL_PATH]
+    assert len(store.saved) == 1
+    # A reload: setup again on the same hass (the reload cycle) —
+    # the existing dashboard must be left alone.
+    await async_unload_entry(hass, entry)
+    assert await async_setup_entry(hass, entry) is True
+    assert len(collection.created) == 1
+    assert len(store.saved) == 1
+    # And a second entry on the same install.
+    other = _wire(make_entry(entry_id="other"), hass.registry)
+    assert await async_setup_entry(hass, other) is True
+    assert len(collection.created) == 1
+    assert len(store.saved) == 1
+
+
+async def test_setup_leaves_an_existing_user_dashboard_alone(
+    hass, make_entry
+) -> None:
+    """A dashboard already occupying the stable url_path — the user's
+    own — is never overwritten, deleted or duplicated: no metadata
+    create AND no strategy save against its content manager."""
+    users_dashboard = {"url_path": DASHBOARD_URL_PATH, "title": "My Board"}
+    collection = _install_dashboard_collection(hass, items=[users_dashboard])
+    entry = _wire(make_entry(), hass.registry)
+    assert await async_setup_entry(hass, entry) is True
+    assert collection.created == []
+    assert collection.items[0] is users_dashboard
+    users_store = hass.data["lovelace"]["dashboards"][DASHBOARD_URL_PATH]
+    assert users_store.saved == []
+    assert users_store.config is None
+
+
+async def test_setup_succeeds_without_the_dashboards_collection(
+    hass, make_entry, caplog
+) -> None:
+    """YAML mode / lovelace not loaded: log a warning, continue setup."""
+    entry = _wire(make_entry(), hass.registry)
+    assert await async_setup_entry(hass, entry) is True
+    assert entry.entry_id in hass.data[DOMAIN]
+    assert any(
+        "dashboard" in record.message.lower()
+        and record.levelname == "WARNING"
+        for record in caplog.records
+    )
+
+
+async def test_setup_survives_a_failing_dashboards_collection(
+    hass, make_entry
+) -> None:
+    """A collection that refuses the create (permissions, admin-only)
+    logs a warning and setup still succeeds — entities come up."""
+    class _RefusingCollection(FakeDashboardsCollection):
+        async def async_create_item(self, item_config):
+            raise PermissionError("not an admin")
+
+    collection = _RefusingCollection(hass)
+    hass.data["lovelace"] = {
+        "mode": "storage",
+        "dashboards": {},
+        "dashboards_collection": collection,
+    }
+    entry = _wire(make_entry(), hass.registry)
+    assert await async_setup_entry(hass, entry) is True
+    assert collection.created == []
+
+
+async def test_setup_survives_a_failing_content_manager_save(
+    hass, make_entry
+) -> None:
+    """A content manager that refuses the config save after the
+    metadata create succeeded (storage write failure) logs a warning
+    and setup still succeeds — the dashboard exists, the strategy
+    simply was not persisted through it."""
+    class _RefusingStore(FakeDashboardStore):
+        async def async_save(self, config):
+            raise OSError("disk full")
+
+    class _StorelessCreateCollection(FakeDashboardsCollection):
+        async def async_create_item(self, item_config):
+            await asyncio.sleep(0)
+            self.created.append(dict(item_config))
+            self.items.append(dict(item_config))
+            self.stores[item_config["url_path"]] = _RefusingStore()
+            self.hass.data["lovelace"]["dashboards"][
+                item_config["url_path"]
+            ] = self.stores[item_config["url_path"]]
+
+    collection = _StorelessCreateCollection(hass)
+    hass.data["lovelace"] = {
+        "mode": "storage",
+        "dashboards": {},
+        "dashboards_collection": collection,
+    }
+    entry = _wire(make_entry(), hass.registry)
+    assert await async_setup_entry(hass, entry) is True
+    assert len(collection.created) == 1
+    store = hass.data["lovelace"]["dashboards"][DASHBOARD_URL_PATH]
+    assert store.saved == []
+
+
+async def test_concurrent_registrations_create_the_dashboard_once(hass) -> None:
+    """Two CONCURRENT registrations (the race two entry setups run)
+    must produce exactly ONE dashboard: the single-flight guard makes
+    the second caller's exists-check run after the first caller's
+    create completed, so it skips both steps.  The fake's create
+    yields before recording, so without the guard both callers would
+    pass the exists-check and the dashboard would be created twice."""
+    collection = _install_dashboard_collection(hass)
+    results = await asyncio.gather(
+        async_register_dashboard(hass),
+        async_register_dashboard(hass),
+    )
+    assert results == [True, True]
+    assert len(collection.created) == 1
+    assert len(collection.stores[DASHBOARD_URL_PATH].saved) == 1

tests/test_panel_cards.py

@@ -5,16 +5,27 @@ the contract by reading the card sources and the built bundle, in the same
 spirit as test_frontend.py. They cover the states decided in
 design/PANEL-EMPTY-STATES.md and PANEL-SPEC.md, and guard the kid-facing
 bundles against ever gaining a parent-only service call.
+
+The party board additionally has render tests: they drive
+frontend/tests/render-party-board.mjs, which imports the built bundle into a
+jsdom window and reports the ordered plates the shadow DOM renders, so the
+zero-config discovery contract is asserted against the bundle HACS ships.
 """
 from __future__ import annotations
 
+import json
+import subprocess
 from pathlib import Path
 
 REPO_ROOT = Path(__file__).parent.parent
-FRONTEND_CARDS_DIR = REPO_ROOT / "frontend" / "src" / "cards"
+FRONTEND_DIR = REPO_ROOT / "frontend"
+FRONTEND_CARDS_DIR = FRONTEND_DIR / "src" / "cards"
 PARTY_BOARD = FRONTEND_CARDS_DIR / "party-board.ts"
 QUEST_LOG = FRONTEND_CARDS_DIR / "quest-log.ts"
 BUNDLE_PATH = REPO_ROOT / "custom_components" / "nestquest" / "www" / "nestquest-cards.js"
+RENDER_HARNESS = FRONTEND_DIR / "tests" / "render-party-board.mjs"
+STRATEGY_HARNESS = FRONTEND_DIR / "tests" / "render-strategy.mjs"
+STRATEGY_SOURCE = FRONTEND_DIR / "src" / "strategy.ts"
 
 PANEL_SOURCES = (PARTY_BOARD, QUEST_LOG)
 
@@ -157,4 +168,281 @@ def test_panel_cards_reference_no_admin_only_services() -> None:
     assert BUNDLE_PATH.is_file()
     bundle = _read(BUNDLE_PATH)
     assert "nestquest-party-board-card" in bundle
-    assert "nestquest-quest-log-card" in bundle
+    assert "nestquest-quest-log-card" in bundle
+
+
+def test_party_board_discovers_children_from_the_household_roster() -> None:
+    """Feature 20: with no child_order configured, the board discovers
+    the ordered child slugs from the household rollup's child_roster
+    attribute; explicit configuration still wins."""
+    source = _read(PARTY_BOARD)
+    assert "child_roster" in source
+    assert "sensor.nestquest_household_quests_due_today" in source
+    # Discovery only fills in for a MISSING child_order; a supplied
+    # order array is honoured verbatim before the discovered list is
+    # ever consulted.
+    assert "Array.isArray(order)" in source
+    assert "_discoveredChildSlugs()" in source
+
+
+# --- Render tests (built bundle under jsdom) ---------------------------------
+
+#: The seeded three-child household, in the API's sort order: Ada and
+#: Bo share one daily quest (Bo is away today), Cory has none.
+ROSTER = [
+    {"child_id": 1, "name": "Ada", "slug": "ada"},
+    {"child_id": 2, "name": "Bo", "slug": "bo"},
+    {"child_id": 3, "name": "Cory", "slug": "cory"},
+]
+
+
+def _state(state: str, **attributes) -> dict:
+    return {"state": state, "attributes": attributes}
+
+
+def _three_child_states() -> dict:
+    """The hass states a three-child household exposes.
+
+    Entity ids follow the documented naming contract
+    (design/ENTITIES-AND-SERVICES.md §1): the household rollup and the
+    per-child sensors slugged from the child names.
+    """
+    return {
+        "sensor.nestquest_household_quests_due_today": _state(
+            "2",
+            children={"1": 1, "2": 1, "3": 0},
+            child_roster=ROSTER,
+        ),
+        "sensor.nestquest_ada_quests_due_today": _state(
+            "1", child_name="Ada", present=True
+        ),
+        "sensor.nestquest_ada_quests_completed_today": _state("0"),
+        "sensor.nestquest_ada_completion_pct_today": _state("0"),
+        "binary_sensor.nestquest_ada_present_today": _state("on"),
+        "sensor.nestquest_bo_quests_due_today": _state(
+            "1", child_name="Bo", present=False
+        ),
+        "sensor.nestquest_bo_quests_completed_today": _state("0"),
+        "sensor.nestquest_bo_completion_pct_today": _state("0"),
+        "binary_sensor.nestquest_bo_present_today": _state("off"),
+        "sensor.nestquest_cory_quests_due_today": _state(
+            "0", child_name="Cory", present=True
+        ),
+        "sensor.nestquest_cory_quests_completed_today": _state("0"),
+        "sensor.nestquest_cory_completion_pct_today": _state("100"),
+        "binary_sensor.nestquest_cory_present_today": _state("on"),
+    }
+
+
+def _render_party_board(config: dict, states: dict) -> dict:
+    """Render the built bundle's party board and return its plates.
+
+    Drives frontend/tests/render-party-board.mjs: the harness imports
+    the committed bundle (the artifact HACS ships) into a jsdom window,
+    mounts the card with the given config and hass snapshot, and prints
+    the ordered plates its shadow DOM renders.
+    """
+    assert BUNDLE_PATH.is_file(), "bundle missing: run cd frontend && npm run build"
+    assert RENDER_HARNESS.is_file()
+    spec = {
+        "bundle": str(BUNDLE_PATH),
+        "tag": "nestquest-party-board-card",
+        "config": config,
+        "hass": {"config": {"time_zone": "UTC"}, "states": states},
+    }
+    completed = subprocess.run(
+        ["node", str(RENDER_HARNESS)],
+        input=json.dumps(spec),
+        capture_output=True,
+        text=True,
+        timeout=120,
+    )
+    assert completed.returncode == 0, (
+        f"render harness failed: {completed.stderr}"
+    )
+    return json.loads(completed.stdout)
+
+
+def test_party_board_renders_discovered_children_in_sort_order() -> None:
+    """No child_order key: three plates render in the roster's sort
+    order (the coordinator snapshot's order), one per child."""
+    result = _render_party_board(
+        {"type": "custom:nestquest-party-board-card"},
+        _three_child_states(),
+    )
+    assert result["plates"] == [
+        {"name": "Ada", "kind": "present"},
+        {"name": "Bo", "kind": "away"},
+        {"name": "Cory", "kind": "present"},
+    ]
+
+
+def test_explicit_child_order_still_wins_over_discovery() -> None:
+    """A supplied child_order keeps working: it overrides the household
+    roster's order and limits the plates to the configured slugs."""
+    result = _render_party_board(
+        {
+            "type": "custom:nestquest-party-board-card",
+            "child_order": ["bo", "ada"],
+        },
+        _three_child_states(),
+    )
+    assert [plate["name"] for plate in result["plates"]] == ["Bo", "Ada"]
+    assert "Cory" not in [plate["name"] for plate in result["plates"]]
+
+# --- Dashboard strategy tests -------------------------------------------------
+
+STRATEGY_NAME = "nestquest-party"
+
+
+def _generate_dashboard(config: dict, states: dict, url: str | None = None) -> dict:
+    """Generate the strategy's dashboard from the built bundle.
+
+    Drives frontend/tests/render-strategy.mjs: the harness imports the
+    committed bundle into a jsdom window at the given dashboard URL and
+    prints the views ``window.customStrategies["nestquest-party"].
+    generate(config, hass)`` returns.
+    """
+    assert BUNDLE_PATH.is_file(), "bundle missing: run cd frontend && npm run build"
+    assert STRATEGY_HARNESS.is_file()
+    spec = {
+        "bundle": str(BUNDLE_PATH),
+        "url": url or "http://homeassistant.local/nestquest/party",
+        "config": config,
+        "hass": {"config": {"time_zone": "UTC"}, "states": states},
+    }
+    completed = subprocess.run(
+        ["node", str(STRATEGY_HARNESS)],
+        input=json.dumps(spec),
+        capture_output=True,
+        text=True,
+        timeout=120,
+    )
+    assert completed.returncode == 0, (
+        f"strategy harness failed: {completed.stderr}"
+    )
+    return json.loads(completed.stdout)
+
+
+def test_strategy_is_registered_on_the_bundle() -> None:
+    """The strategy ships in the same bundle as the cards and registers
+    itself under window.customStrategies so a dashboard can use
+    strategy: { type: custom:nestquest-party }."""
+    source = _read(STRATEGY_SOURCE)
+    assert "customStrategies" in source
+    assert f'["{STRATEGY_NAME}"]' in source or f'"{STRATEGY_NAME}"' in source
+    bundle = _read(BUNDLE_PATH)
+    assert "nestquest-party" in bundle
+
+
+def test_strategy_generates_views_for_three_children() -> None:
+    """For the seeded three-child household the strategy generates one
+    party-board view plus one quest-log view per child in roster order,
+    with COMPUTED paths: the board view at the dashboard root, each log
+    view at the child's slug so quest-log.ts's childSlugFromPath reads
+    the child from the URL's last segment."""
+    result = _generate_dashboard({}, _three_child_states())
+    views = result["views"]
+    assert len(views) == 4
+    assert [view["path"] for view in views] == [
+        "party",
+        "ada",
+        "bo",
+        "cory",
+    ]
+    assert [view["title"] for view in views] == [
+        "The Party",
+        "Ada's Quest Log",
+        "Bo's Quest Log",
+        "Cory's Quest Log",
+    ]
+
+
+def test_strategy_every_view_is_panel_type() -> None:
+    """Every generated view carries ``type: "panel"``: Home Assistant
+    defaults an unspecified view to Masonry, which constrains the
+    1080px-tall NestQuest card to a narrow column (README's TouchHub
+    setup warns of exactly this); with a generated dashboard there is
+    no editor step left to set Panel by hand."""
+    result = _generate_dashboard({}, _three_child_states())
+    for view in result["views"]:
+        assert view["type"] == "panel"
+
+
+def test_strategy_log_view_titles_use_the_roster_display_name() -> None:
+    """Quest-log view titles come from the roster's ``name`` field (the
+    child's display name), not the lowercased entity-id slug; the slug
+    stays the view's path."""
+    result = _generate_dashboard(
+        {},
+        {
+            "sensor.nestquest_household_quests_due_today": _state(
+                "0",
+                child_roster=[
+                    {"child_id": 7, "name": "Milo", "slug": "milo"},
+                ],
+            ),
+        },
+    )
+    views = result["views"]
+    assert len(views) == 2
+    assert views[1]["path"] == "milo"
+    assert views[1]["title"] == "Milo's Quest Log"
+
+
+def test_strategy_passes_weather_entity_through_to_the_cards() -> None:
+    """An explicit ``weather_entity`` in the strategy configuration is
+    passed through to the generated card configs (both the board and
+    the quest log render the weather dock when it is set)."""
+    result = _generate_dashboard(
+        {"weather_entity": "weather.home"},
+        _three_child_states(),
+    )
+    views = result["views"]
+    for view in views:
+        assert view["cards"][0]["weather_entity"] == "weather.home"
+    # And without it, no weather_entity key is emitted at all.
+    unset = _generate_dashboard({}, _three_child_states())
+    for view in unset["views"]:
+        assert "weather_entity" not in view["cards"][0]
+
+
+def test_strategy_wires_navigation_between_the_views() -> None:
+    """The board's quest_log_path and each log's board_path are computed
+    to the dashboard root the strategy renders at, so party-board.ts's
+    crest tap pushes <root>/<slug> and quest-log.ts's idle return goes
+    back to the board — neither path is configured by hand."""
+    dashboard_url = "http://homeassistant.local/nestquest"
+    root = "/nestquest"
+    result = _generate_dashboard(
+        {}, _three_child_states(), url=dashboard_url
+    )
+    views = result["views"]
+    board = views[0]["cards"][0]
+    assert board["type"] == "custom:nestquest-party-board-card"
+    assert board["quest_log_path"] == root
+    for slug, view in zip(("ada", "bo", "cory"), views[1:]):
+        assert view["cards"][0]["type"] == "custom:nestquest-quest-log-card"
+        assert view["cards"][0]["board_path"] == root
+
+
+def test_strategy_zero_children_still_generates_the_board() -> None:
+    """With an empty roster (NestQuest not set up yet) the strategy
+    renders the board view alone — the board card shows its own
+    "not set up yet" notice for an empty roster — and never crashes."""
+    result = _generate_dashboard({}, {})
+    assert len(result["views"]) == 1
+    assert result["views"][0]["path"] == "party"
+
+
+def test_strategy_config_overrides_still_apply() -> None:
+    """Explicit strategy configuration wins where the design allows: an
+    explicit url_path pins the computed dashboard root."""
+    result = _generate_dashboard(
+        {"url_path": "/wallboard"},
+        _three_child_states(),
+    )
+    root = "/wallboard"
+    assert result["views"][0]["cards"][0]["quest_log_path"] == root
+    for view in result["views"][1:]:
+        assert view["cards"][0]["board_path"] == root

tests/test_sensors.py

@@ -19,6 +19,7 @@ from custom_components.nestquest import async_setup_entry, async_unload_entry
 from custom_components.nestquest.const import DOMAIN
 from custom_components.nestquest.sensor import (
     MAX_STATE_LENGTH,
+    _slugify,
     _state_within_limit,
 )
 
@@ -539,3 +540,115 @@ async def test_household_rollups_sum_the_active_children(
     assert cycle_day_entity.name == "NestQuest cycle day"
     assert cycle_day_entity.native_value == 4
     assert cycle_day_entity.extra_state_attributes["today"] == _today_iso()
+
+
+async def test_household_due_sensor_publishes_the_ordered_child_roster(
+    hass, make_entry
+) -> None:
+    """Feature 20: the rollup carries the ordered child roster beside
+    the unchanged per-child ``children`` counts, so the panel cards can
+    discover the board without a configured child_order.  The order is
+    the coordinator snapshot's (the API's sort_order, then id)."""
+    entry, _coordinator, _client = await _setup_entry(
+        hass, make_entry, _seeded_payload()
+    )
+    attributes = hass.entities[
+        "nestquest_household_quests_due_today"
+    ].extra_state_attributes
+    assert attributes["child_roster"] == [
+        {"child_id": ADA, "name": "Ada", "slug": "ada"},
+        {"child_id": BO, "name": "Bo", "slug": "bo"},
+        {"child_id": CORY, "name": "Cory", "slug": "cory"},
+    ]
+    # The pre-existing per-child counts attribute is untouched.
+    assert attributes["children"] == {
+        str(ADA): 1,
+        str(BO): 1,
+        str(CORY): 0,
+    }
+
+
+async def test_household_roster_tracks_the_snapshot_on_refresh(
+    hass, make_entry
+) -> None:
+    """The roster re-derives from every snapshot: a reorder and a
+    rename in the API payload show up (with the re-derived slug) on the
+    next refresh, like the sensor names already do."""
+    reordered = _payload(
+        [
+            _child(CORY, "Cory"),
+            _child(ADA, "Ada", [_instance(7, ADA)]),
+            _child(BO, "Mirren", [_instance(8, BO)]),
+        ]
+    )
+    entry, coordinator, _client = await _setup_entry(
+        hass, make_entry, _seeded_payload(), reordered
+    )
+    roster_entity = hass.entities["nestquest_household_quests_due_today"]
+    assert [entry["slug"] for entry in roster_entity.extra_state_attributes["child_roster"]] == [
+        "ada",
+        "bo",
+        "cory",
+    ]
+
+    await coordinator.async_refresh()
+
+    assert roster_entity.extra_state_attributes["child_roster"] == [
+        {"child_id": CORY, "name": "Cory", "slug": "cory"},
+        {"child_id": ADA, "name": "Ada", "slug": "ada"},
+        {"child_id": BO, "name": "Mirren", "slug": "mirren"},
+    ]
+
+
+async def test_duplicate_display_names_get_registry_suffix_slugs(
+    hass, make_entry
+) -> None:
+    """Two children may share a nickname (the children layer allows
+    it); the roster's slugs then mirror the registry's collision
+    suffixing (_2, _3, ...) in snapshot order, so both plates resolve."""
+    payload = _payload(
+        [
+            _child(ADA, "Ada", [_instance(7, ADA)]),
+            _child(BO, "Ada"),
+        ]
+    )
+    entry, _coordinator, _client = await _setup_entry(hass, make_entry, payload)
+    assert hass.entities[
+        "nestquest_household_quests_due_today"
+    ].extra_state_attributes["child_roster"] == [
+        {"child_id": ADA, "name": "Ada", "slug": "ada"},
+        {"child_id": BO, "name": "Ada", "slug": "ada_2"},
+    ]
+
+
+async def test_empty_household_publishes_an_empty_roster(
+    hass, make_entry
+) -> None:
+    """An empty household is a valid 0: the roster is an empty list,
+    and the card's discovery of it renders the not-set-up notice."""
+    entry, _coordinator, _client = await _setup_entry(
+        hass, make_entry, _payload([])
+    )
+    attributes = hass.entities[
+        "nestquest_household_quests_due_today"
+    ].extra_state_attributes
+    assert attributes["child_roster"] == []
+    assert attributes["children"] == {}
+
+
+def test_slugify_mirrors_home_assistant_entity_id_derivation() -> None:
+    """The slug mirror matches homeassistant.util.slugify for the names
+    children are registered with (verified against HA's own slugify)."""
+    assert _slugify("Ada") == "ada"
+    assert _slugify("Mary Jane") == "mary_jane"
+    assert _slugify("Mary-Jane") == "mary_jane"
+    assert _slugify("O'Brien") == "o_brien"
+    assert _slugify("Émilie") == "emilie"
+    assert _slugify("Åsa") == "asa"
+    assert _slugify("  Bo  ") == "bo"
+    # HA's wrapper answers "unknown" when a name slugs to nothing.
+    assert _slugify("   ") == "unknown"
+    assert _slugify("?!?") == "unknown"
+    # The registry caps the entity_id at 64 characters, so the slugged
+    # object id alone is capped at 64 - len("sensor.").
+    assert _slugify("a" * 80) == "a" * (64 - len("sensor."))