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/lib/settings.ts

@@ -0,0 +1,28 @@
+export interface AppSettings {
+  desktop: boolean
+  popup: boolean
+  composePopup: boolean
+}
+
+const KEY = 'mailclient.notifySettings'
+
+const DEFAULTS: AppSettings = { desktop: true, popup: true, composePopup: false }
+
+export function loadAppSettings(): AppSettings {
+  try {
+    const raw = localStorage.getItem(KEY)
+    if (!raw) return DEFAULTS
+    const parsed = JSON.parse(raw) as Partial<AppSettings>
+    return {
+      desktop: parsed.desktop ?? DEFAULTS.desktop,
+      popup: parsed.popup ?? DEFAULTS.popup,
+      composePopup: parsed.composePopup ?? DEFAULTS.composePopup,
+    }
+  } catch {
+    return DEFAULTS
+  }
+}
+
+export function saveAppSettings(v: AppSettings) {
+  localStorage.setItem(KEY, JSON.stringify(v))
+}