T08c: Frontend Mail UI + Global Search UI — 44 tests, tsc clean, vite build pass

- Mail page: 3-pane layout (folder tree + mail list + reading pane)
- Compose modal: rich text editor (bold/italic/link), template picker, reply/forward pre-fill
- Mail settings: accounts, signatures, rules, labels, vacation, PGP (6 tabs)
- Shared mailbox selector: switch between personal + shared accounts
- Mail search bar + attachment download + create-event-from-mail
- Global search: tabs for companies/contacts/mails/files/events
- Search autocomplete in TopBar (existing SearchDropdown)
- API client: mail.ts (all endpoints)
- Routes: /mail, /mail/settings
- i18n: de.json + en.json mail + search translations
- 44 new tests (4 test files), full regression 318/318 pass
- tsc --noEmit: 0 errors, vite build: 267 modules

.a0/project_state.json

@@ -1,10 +1,10 @@
 {
   "project_name": "leocrm",
   "phase": "phase-3-implementation",
-  "status": "T06_complete_3_tasks_remaining",
-  "last_commit": "f646c59",
-  "completed_tasks": ["T01","T02","T03","T04","T05","T06","T07a","T07b","T08b","T09","T11"],
+  "status": "T08a_complete_2_tasks_remaining",
+  "last_commit": "0962f3a",
+  "completed_tasks": ["T01","T02","T03","T04","T05","T06","T07a","T07b","T08a","T08b","T09","T11"],
   "current_task": null,
-  "next_task": "T08a",
-  "updated_at": "2026-07-01T15:41:00+02:00"
+  "next_task": "T08c",
+  "updated_at": "2026-07-01T16:54:00+02:00"
 }