feat(tracking): per-config quiet hours with app-level IANA timezone

Add quiet_hours_enabled/start/end to TrackingConfig (HH:MM strings
interpreted in the app-level timezone AppSetting). The dispatch path
loads the app timezone once per run and passes it through
event_allowed_by_config -> in_quiet_hours, so overnight windows like
22:00-07:00 work correctly in any IANA tz.

Frontend exposes a Timezone field under Settings and a Quiet Hours
section on the Immich tracking-config form with time-picker inputs.

packages/server/src/notify_bridge_server/services/dispatch_helpers.py

@@ -5,6 +5,7 @@ from __future__ import annotations
 import logging
 from datetime import datetime, time, timezone
 from typing import Any
+from zoneinfo import ZoneInfo, ZoneInfoNotFoundError
 
 from sqlmodel import select
 from sqlmodel.ext.asyncio.session import AsyncSession
@@ -29,12 +30,32 @@ from ..database.models import (
 _LOGGER = logging.getLogger(__name__)
 
 
-def in_quiet_hours(start: str | None, end: str | None) -> bool:
-    """Check if the current UTC time is within the quiet hours window."""
+def _resolve_zoneinfo(tz_name: str | None) -> ZoneInfo:
+    """Resolve an IANA tz string to a ZoneInfo, falling back to UTC on any error."""
+    if not tz_name:
+        return ZoneInfo("UTC")
+    try:
+        return ZoneInfo(tz_name)
+    except (ZoneInfoNotFoundError, ValueError):
+        _LOGGER.warning("Unknown timezone %r; falling back to UTC", tz_name)
+        return ZoneInfo("UTC")
+
+
+def in_quiet_hours(
+    start: str | None,
+    end: str | None,
+    tz_name: str | None = "UTC",
+) -> bool:
+    """Check if the current time (in the given timezone) is within the quiet window.
+
+    HH:MM strings are interpreted in the supplied timezone. If either bound is
+    missing, quiet hours are disabled.
+    """
     if not start or not end:
         return False
     try:
-        now = datetime.now(timezone.utc).time()
+        tz = _resolve_zoneinfo(tz_name)
+        now = datetime.now(timezone.utc).astimezone(tz).time()
         t_start = time.fromisoformat(start)
         t_end = time.fromisoformat(end)
         if t_start <= t_end:
@@ -46,8 +67,25 @@ def in_quiet_hours(start: str | None, end: str | None) -> bool:
         return False
 
 
-def event_allowed_by_config(event: ServiceEvent, tc: TrackingConfig) -> bool:
-    """Check if an event type is allowed by the tracking config's flags."""
+async def get_app_timezone(session: AsyncSession) -> str:
+    """Load the app-level timezone from AppSetting (falls back to UTC)."""
+    from ..api.app_settings import get_setting
+    value = await get_setting(session, "timezone")
+    return value or "UTC"
+
+
+def event_allowed_by_config(
+    event: ServiceEvent,
+    tc: TrackingConfig,
+    tz_name: str | None = "UTC",
+) -> bool:
+    """Check if an event is allowed by the tracking config's flags + quiet hours."""
+    # Quiet hours gate every event type when enabled.
+    if tc.quiet_hours_enabled and in_quiet_hours(
+        tc.quiet_hours_start, tc.quiet_hours_end, tz_name
+    ):
+        return False
+
     event_type = event.event_type.value
     flag_map = {
         # Immich events