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
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