Fix review findings: first-refresh handling, stale runtime record, P3s

P1: the first-refresh error handling never fired against real Home
Assistant.  Real DataUpdateCoordinator.async_config_entry_first_refresh
converts ANY refresh failure into ConfigEntryNotReady (the original
exception survives only as __cause__), so `except NestQuestApiError`
could never match: the failure fell through to the outer except block,
unwound listeners, closed the DB and re-raised, and
async_forward_entry_setups never ran — no entities at all.  Two-sided
fix: _async_update_data now converts every typed NestQuestApiError
(unconfigured stub, transport failure, non-2xx) into
homeassistant.helpers.update_coordinator.UpdateFailed — the exception
HA's coordinator machinery records as a failed pass
(last_update_success=False, data=None) — and setup catches
ConfigEntryNotReady around the first refresh instead, so an unconfigured
API or failed fetch keeps setup alive with unavailable entities while
everything else still unwinds.  The conftest DataUpdateCoordinator
stand-in now reproduces HA's real contract (async_refresh records a
failure instead of raising; first_refresh wraps it in
ConfigEntryNotReady) and gains an UpdateFailed stand-in, so this class
of bug is caught by the suite — verified by reverting the catch, which
fails both unconfigured-API and failed-fetch tests.

P1: a stale hass.data[DOMAIN][entry.entry_id] survived a failed setup.
The runtime record registers in hass.data before the first refresh and
platform forward, but the except cleanup only cleared
entry.runtime_data; after any failure in that window a later unload
picked up the stale, already-torn-down record and re-invoked the
already-consumed update-listener remover (ValueError).  The except block
now also pops the hass.data entry, and
test_setup_failure_after_registration_shuts_coordinator_down (reworked
from the fiction-based first-refresh trigger: a failed first refresh is
tolerated setup, not an unwind) proves a failed setup followed by an
unload does not raise and leaves no residue.

P3: dropped the function-local re-import of NestQuestApiClient in
coordinator_client_from_entry (module-level import already covers it),
and the unused coordinator_client_from_entry alias in the conftest
fixture.

P3: test_due_today_payload_omits_missed_admin_equals_panel dropped the
missed-instance count assertions in the Feature 18 rewrite; restored
quests_completed_today == 0 / quests_remaining_today == 1 so the
missed-derivation + counts pairing stays verified (the counts arrive
precomputed and still roll the full day).

custom_components/nestquest/__init__.py

@@ -16,7 +16,6 @@ from homeassistant.core import HomeAssistant
 from homeassistant.exceptions import ConfigEntryNotReady
 from homeassistant.helpers.event import async_track_time_change
 
-from .api_client import NestQuestApiError
 from .const import (
     CONF_ADMIN_USER_IDS,
     CONF_UPDATE_INTERVAL,
@@ -526,10 +525,16 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
         # (unconfigured token, API service down) does NOT crash setup:
         # the coordinator reports last_update_success=False, entities
         # come up unavailable, and HA's standard retry cycle applies
-        # once the API is reachable.  Any non-API error still raises.
+        # once the API is reachable.  HA's real
+        # ``async_config_entry_first_refresh`` wraps ANY failed update
+        # pass in ConfigEntryNotReady — the original error survives
+        # only as ``__cause__``, never as the raised exception — so the
+        # catch keys on ConfigEntryNotReady, NOT on the typed API
+        # error.  Everything else (a platform-forward failure,
+        # cancellation) still unwinds through the except block below.
         try:
             await coordinator.async_config_entry_first_refresh()
-        except NestQuestApiError:
+        except ConfigEntryNotReady:
             pass
         await hass.config_entries.async_forward_entry_setups(entry, PLATFORMS)
     except BaseException:
@@ -564,6 +569,12 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
         # closes the already-closed database through the stale record.
         if getattr(entry, "runtime_data", None) is not None:
             entry.runtime_data = None
+        # The runtime record was ALSO registered in hass.data before
+        # the first refresh: remove it here on ANY failure, or a later
+        # unload picks up the stale, already-torn-down record
+        # (hass.data wins over entry.runtime_data there) and
+        # re-invokes the already-consumed update-listener remover.
+        hass.data.get(DOMAIN, {}).pop(entry.entry_id, None)
         await database.close()
         raise
     assert remove_update_listener is not None