Add HMS error notifications with translations and plate detection fixes

New Features:
- HMS error notifications with human-readable messages (853 error codes)
- Plate not empty notification category (separate toggle in settings)
- Module-friendly names: Print/Task, AMS/Filament, Nozzle/Extruder, etc.
- Backup/restore now includes plate calibration reference images

Fixes:
- Plate calibration images now persist after restart in Docker
- Telegram notifications no longer fail on error codes with underscores
- Plate detection combo button: main toggles detection, chevron opens modal

Tests:
- Added HMS error code tests (10 tests)
- Implemented Dashboard, FileManagerModal, UploadModal tests (previously skipped)
- Added notification service tests for HMS errors and plate detection
- Fixed AuthContext unmount memory leak in tests

frontend/src/api/client.ts

@@ -1184,6 +1184,8 @@ export interface NotificationProvider {
   // AMS-HT environmental alarms
   on_ams_ht_humidity_high: boolean;
   on_ams_ht_temperature_high: boolean;
+  // Build plate detection
+  on_plate_not_empty: boolean;
   // Quiet hours
   quiet_hours_enabled: boolean;
   quiet_hours_start: string | null;
@@ -1224,6 +1226,8 @@ export interface NotificationProviderCreate {
   // AMS-HT environmental alarms
   on_ams_ht_humidity_high?: boolean;
   on_ams_ht_temperature_high?: boolean;
+  // Build plate detection
+  on_plate_not_empty?: boolean;
   // Quiet hours
   quiet_hours_enabled?: boolean;
   quiet_hours_start?: string | null;
@@ -1257,6 +1261,8 @@ export interface NotificationProviderUpdate {
   // AMS-HT environmental alarms
   on_ams_ht_humidity_high?: boolean;
   on_ams_ht_temperature_high?: boolean;
+  // Build plate detection
+  on_plate_not_empty?: boolean;
   // Quiet hours
   quiet_hours_enabled?: boolean;
   quiet_hours_start?: string | null;