Comprehensive review fixes: security, performance, code quality, and UI polish

Backend: Fix CORS wildcard+credentials, add secret key warning, remove raw
API keys from sync endpoint, fix N+1 queries in watcher/sync, fix
AttributeError on event_types, delete dead scheduled.py/templates.py,
add limit cap on history, re-validate server on URL/key update, apply
tracking/template config IDs in update_target.

HA Integration: Replace datetime.now() with dt_util.now(), fix notification
queue to only remove successfully sent items, use album UUID for entity
unique IDs, add shared links dirty flag and users cache hourly refresh,
deduplicate _is_quiet_hours, add HTTP timeouts, cache albums in config
flow, change iot_class to local_polling.

Frontend: Make i18n reactive via $state (remove window.location.reload),
add Modal transitions/a11y/Escape key, create ConfirmModal replacing all
confirm() calls, add error handling to all pages, replace Unicode nav
icons with MDI SVGs, add card hover effects, dashboard stat icons, global
focus-visible styles, form slide transitions, mobile responsive bottom
nav, fix password error color, add ~20 i18n keys (EN/RU).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

custom_components/immich_album_watcher/sensor.py

@@ -174,7 +174,7 @@ class ImmichAlbumBaseSensor(CoordinatorEntity[ImmichAlbumWatcherCoordinator], Se
         self._album_id = subentry.data[CONF_ALBUM_ID]
         self._album_name = subentry.data.get(CONF_ALBUM_NAME, "Unknown Album")
         self._hub_name = entry.data.get(CONF_HUB_NAME, "Immich")
-        self._unique_id_prefix = slugify(f"{self._hub_name}_album_{self._album_name}")
+        self._unique_id_prefix = slugify(f"{self._hub_name}_{self._album_id}")
 
     @property
     def _album_data(self) -> AlbumData | None:
@@ -239,27 +239,6 @@ class ImmichAlbumBaseSensor(CoordinatorEntity[ImmichAlbumWatcherCoordinator], Se
         )
         return {"assets": assets}
 
-    @staticmethod
-    def _is_quiet_hours(start_str: str | None, end_str: str | None) -> bool:
-        """Check if current time is within quiet hours."""
-        from datetime import time as dt_time
-        from homeassistant.util import dt as dt_util
-
-        if not start_str or not end_str:
-            return False
-
-        try:
-            now = dt_util.now().time()
-            start_time = dt_time.fromisoformat(start_str)
-            end_time = dt_time.fromisoformat(end_str)
-        except ValueError:
-            return False
-
-        if start_time <= end_time:
-            return start_time <= now < end_time
-        else:
-            return now >= start_time or now < end_time
-
     async def async_send_telegram_notification(
         self,
         chat_id: str,
@@ -280,7 +259,8 @@ class ImmichAlbumBaseSensor(CoordinatorEntity[ImmichAlbumWatcherCoordinator], Se
     ) -> ServiceResponse:
         """Send notification to Telegram."""
         # Check quiet hours — queue notification if active
-        if self._is_quiet_hours(quiet_hours_start, quiet_hours_end):
+        from . import _is_quiet_hours
+        if _is_quiet_hours(quiet_hours_start, quiet_hours_end):
             from . import _register_queue_timers
             queue: NotificationQueue = self.hass.data[DOMAIN][self._entry.entry_id]["notification_queue"]
             await queue.async_enqueue({