fix(assistant): green CI round after the shared ChatGPT plan

- Tests that still knew the ChatGPT sign-in as personal only follow the
  admin's shared plan: the service takes the caller with their role, the
  admin tiles show ChatGPT, the controller tests cover the admin routes.
- The table refused an instance ChatGPT connection with a CHECK, so
  sharing the plan failed. A new migration rebuilds ai_connections
  without that check; the shipped migration stays as it was.
- useChatgptConnect grew past the function size limit: reading the
  clipboard and noticing the return to the tab are helpers of their own.
- The file link factory hands its overrides over apart from the row,
  like every other factory, which ends the deep type instantiation.
- Knip: exports only their own file used are private again, and the
  booking cap reads MAX_WRITES_PER_STEP instead of an alias.
- lint:i18n-keys reaches the tools' own action names through a key
  builder and the connection hints through literal keys.
- MMehrSheet stays in the assistant hints pair only.

client/scripts/feature-pairs.json

@@ -978,7 +978,6 @@
     "src/mobile/screens/trip/sheets/MDaysSheet.tsx": "Button based day reorder sheet over planner.handleReorderDays; the desktop reorders by drag.",
     "src/mobile/screens/trip/sheets/MImportSheet.tsx": "Menu that routes to ImpFileStep and ImpListStep, with no logic of its own.",
     "src/mobile/screens/trip/sheets/MLinkedCosts.tsx": "Already shares useExpenseLinks with the desktop BookingCostsSection; only markup and a search filter are local.",
-    "src/mobile/screens/trip/sheets/MMehrSheet.tsx": "Phone dock overflow menu that only opens tabs and sheets.",
     "src/mobile/screens/trip/sheets/MTripSheetUi.tsx": "Phone sheet UI primitives (eyebrow, headers, stat boxes, action circles) and a time display helper.",
     "src/mobile/screens/trip/sheets/PlFileAttach.tsx": "Markup only; pending files and link actions come through props from the phone form sheets.",
     "src/mobile/screens/trip/sheets/PlSheetChrome.tsx": "Phone form sheet chrome primitives (header, footer, field classes).",

client/scripts/i18n-unused-baseline.json

@@ -30,7 +30,7 @@
   "planner.ts": 53,
   "reservations.ts": 21,
   "roadtrip.ts": 38,
-  "settings.ts": 40,
+  "settings.ts": 37,
   "share.ts": 7,
   "shared.ts": 2,
   "storage.ts": 16,