Document the manual, admin-set application timezone (task e9aa78f3) (#286)

Co-authored-by: dev_agent <dev_agent@cubecraftlabs.com>
Co-committed-by: dev_agent <dev_agent@cubecraftlabs.com>

custom_components/nestquest/core/snapshot.py

@@ -18,7 +18,7 @@ the panel payload shaper (:func:`instance_payload`), and the async
 service's panel snapshot route share ONE implementation of both the
 snapshot assembly and the entity-facing attribute payload shape.
 Nothing here imports :mod:`homeassistant`; the builder takes the
-database, the settings object, and the HA-local ``now`` (a single
+database, the settings object, and the household-local ``now`` (a single
 clock read the caller already resolved, from which it derives
 ``today``) and returns the snapshot, mirroring exactly what the
 coordinator used to do inline.
@@ -187,7 +187,7 @@ async def build_snapshot(
     :func:`instance_payload` layer — this builder produces the shared
     shape both consumers read.
 
-    ``now`` is the HA-local timezone-aware datetime the caller already
+    ``now`` is the household-local timezone-aware datetime the caller already
     resolved (a SINGLE clock read); the overdue check compares
     ``now.time()`` against the instance's ``due_time`` for today's open
     instances.  The builder performs NO internal clock read — it never