fix: integrations settings squish on mobile (#812) + polish

PhotoProvidersSection:
- Replace raw <input type=checkbox> with TREK's ToggleSwitch so the
  'spiegeln zu Immich'-style options match the rest of the app.
- Wrap action row in flex-wrap so the connected/disconnected badge
  drops to its own line on mobile instead of clipping.
- Add a short 'Test' translation (memories.testShort) shown on mobile
  in place of 'Test connection' — 14 languages kept in sync.

ToggleSwitch:
- Explicit type='button' (never a form submitter), minWidth + flex-
  shrink:0 so the toggle doesn't get squished next to long labels,
  padding:0 so no inherited UA margin warps the inner circle.

MapSettingsTab:
- 'Mapbox' instead of 'Mapbox GL' on narrow screens — the provider
  card is too cramped on mobile for the full name.
- Drop the 'Experimental' badge on mobile entirely; it overlapped
  the title at that width. Still shown on >=sm.

DisplaySettingsTab:
- Time format buttons show just '24h' / '12h' on mobile; the '(14:30)'
  / '(2:30 PM)' hint stays on >=sm. Test updated to match the role
  query since the label is now split across nodes.

client/src/i18n/translations/de.ts

@@ -1625,6 +1625,7 @@ const de: Record<string, string | { name: string; category: string }[]> = {
   'memories.immichAutoUpload': 'Journey-Fotos beim Upload auch zu Immich spiegeln',
   'memories.providerUrlHintSynology': 'Füge den Fotos-App-Pfad in die URL ein, z.B. https://nas:5001/photo',
   'memories.testConnection': 'Verbindung testen',
+  'memories.testShort': 'Testen',
   'memories.testFirst': 'Verbindung zuerst testen',
   'memories.connected': 'Verbunden',
   'memories.disconnected': 'Nicht verbunden',