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.

tsconfig.json

@@ -0,0 +1,7 @@
+{
+  "files": [],
+  "references": [
+    { "path": "./tsconfig.app.json" },
+    { "path": "./tsconfig.node.json" }
+  ]
+}