feat: Immich photo integration — Photos addon with sharing, filters, lightbox

- Immich connection per user (Settings → Immich URL + API Key)
- Photos addon (admin-toggleable, trip tab)
- Manual photo selection from Immich library (date filter + all photos)
- Photo sharing with consent popup, per-photo privacy toggle
- Lightbox with liquid glass EXIF info panel (camera, lens, location, settings)
- Location filter + date sort in gallery
- WebSocket live sync when photos are added/removed/shared
- Proxy endpoints for thumbnails and originals with token auth

client/src/components/Admin/AddonManager.tsx

@@ -3,10 +3,10 @@ import { adminApi } from '../../api/client'
 import { useTranslation } from '../../i18n'
 import { useSettingsStore } from '../../store/settingsStore'
 import { useToast } from '../shared/Toast'
-import { Puzzle, ListChecks, Wallet, FileText, CalendarDays, Globe, Briefcase } from 'lucide-react'
+import { Puzzle, ListChecks, Wallet, FileText, CalendarDays, Globe, Briefcase, Image } from 'lucide-react'
 
 const ICON_MAP = {
-  ListChecks, Wallet, FileText, CalendarDays, Puzzle, Globe, Briefcase,
+  ListChecks, Wallet, FileText, CalendarDays, Puzzle, Globe, Briefcase, Image,
 }
 
 interface Addon {