Adopt Home Assistant's time zone for the API household clock (task 6351b36d) (#275)

Co-authored-by: Joshua <joshua@cnjmail.com>
Co-committed-by: Joshua <joshua@cnjmail.com>

custom_components/nestquest/api_client.py

@@ -6,6 +6,9 @@ speaks the API's panel plane — ``GET /api/v1/panel/snapshot`` (today's
 household snapshot) and ``POST /api/v1/panel/instances/{id}/complete``
 (completion as the tapped child profile) — authenticated with the
 static panel service token as a Bearer credential on every request.
+Every request also reports Home Assistant's configured ``time_zone`` in
+the ``X-NestQuest-Timezone`` header, so the API (which may run UTC)
+reads the household's clock until the admin chooses a zone there.
 
 Transport-injected by construction: the constructor takes the base URL,
 the panel token, and the HTTP session to use.  The session speaks the
@@ -54,6 +57,7 @@ from .const import (
     CONF_PANEL_TOKEN,
     DEFAULT_API_BASE_URL,
     DEFAULT_PANEL_TOKEN,
+    PANEL_TIMEZONE_HEADER,
 )
 
 if TYPE_CHECKING:
@@ -156,7 +160,8 @@ def client_from_entry(hass: Any, entry: Any) -> NestQuestApiClient:
     """Build the production client for a config entry.
 
     Reads the configured base URL and panel token off the entry
-    (:func:`resolve_api_config`) and hands the client Home Assistant's
+    (:func:`resolve_api_config`), reports ``hass.config.time_zone`` as
+    the household zone, and hands the client Home Assistant's
     SHARED aiohttp session (``homeassistant.helpers.aiohttp_client
     .async_get_clientsession``) so panel calls ride HA's one connection
     pool.  The helper import is deferred into this function on purpose:
@@ -168,7 +173,10 @@ def client_from_entry(hass: Any, entry: Any) -> NestQuestApiClient:
 
     base_url, panel_token = resolve_api_config(entry)
     return NestQuestApiClient(
-        base_url, panel_token, async_get_clientsession(hass)
+        base_url,
+        panel_token,
+        async_get_clientsession(hass),
+        household_timezone=hass.config.time_zone,
     )
 
 
@@ -189,9 +197,14 @@ class NestQuestApiClient:
         session: aiohttp.ClientSession,
         *,
         timeout_seconds: float = DEFAULT_TIMEOUT_SECONDS,
+        household_timezone: str | None = None,
     ) -> None:
         """Store the connection settings; the session is injected.
 
+        ``household_timezone`` is Home Assistant's configured IANA
+        ``time_zone``; when given it rides every request in the
+        ``X-NestQuest-Timezone`` header.
+
         ``session`` is an aiohttp ``ClientSession`` in production and a
         stub transport in tests.  ``base_url`` must be a full http(s)
         URL and ``panel_token`` must be non-empty — a client built
@@ -216,6 +229,14 @@ class NestQuestApiClient:
         self._panel_token = panel_token
         self._session = session
         self._timeout_seconds = float(timeout_seconds)
+        self._household_timezone = household_timezone
+
+    def _headers(self) -> dict[str, str]:
+        """The Bearer credential plus the reported household zone."""
+        headers = {"Authorization": f"Bearer {self._panel_token}"}
+        if self._household_timezone:
+            headers[PANEL_TIMEZONE_HEADER] = self._household_timezone
+        return headers
 
     async def get_snapshot(self) -> dict[str, Any]:
         """Fetch and parse today's household snapshot.
@@ -275,7 +296,7 @@ class NestQuestApiClient:
         cleanly and closes the underlying response in every path.
         """
         url = f"{self._base_url}{EVENTS_PATH}"
-        headers = {"Authorization": f"Bearer {self._panel_token}"}
+        headers = self._headers()
         # Opening the response gets ONE request timeout, exactly like
         # ``_request_json``; the read loop below runs WITHOUT one — a
         # body-wide timeout would kill a healthy long-lived stream.
@@ -379,7 +400,7 @@ class NestQuestApiClient:
         raises typed too, carrying the status it arrived with.
         """
         url = f"{self._base_url}{path}"
-        headers = {"Authorization": f"Bearer {self._panel_token}"}
+        headers = self._headers()
         try:
             async with asyncio.timeout(self._timeout_seconds):
                 async with self._session.request(