Initial commit: Outlook-competitor desktop mail client

Tauri v2 (Rust backend, React/TypeScript frontend). IMAP/POP3/SMTP core,
Google OAuth (mail/calendar/contacts sync), CalDAV, local calendar with
recurrence, rules engine, contacts, tasks, unified inbox, context menus,
drag & drop, snooze, templates, and more.

src-tauri/build.rs

@@ -0,0 +1,3 @@
+fn main() {
+  tauri_build::build()
+}