Migrate from window.electron to tauri IPC functions across components

- Replaced `window.electron.invoke` calls with equivalent `tauri` function calls for all IPC interactions.
- Removed `electron.d.ts` TypeScript definitions as they are no longer needed.
- Updated related logic for offline/online state synchronization.
- Added `types.rs` and `shared/mod.rs` modules to support Tauri IPC integration with Rust enums and shared logic.
- Refactored IPC request queues to use updated handler names for consistency with Tauri.

app/login/offline/page.tsx

@@ -5,44 +5,32 @@ import OfflinePinVerify from '@/components/offline/OfflinePinVerify';
 import { useTranslations } from 'next-intl';
 import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
 import { faWifi, faArrowLeft } from '@fortawesome/free-solid-svg-icons';
+import * as tauri from '@/lib/tauri';
 
 export default function OfflineLoginPage() {
     const t = useTranslations();
 
-    async function handlePinSuccess(userId: string):Promise<void> {
-
-        // Initialize database with user's encryption key
-        if (window.electron) {
-            try {
-                // Get encryption key
-                const encryptionKey = await window.electron.getUserEncryptionKey(userId);
-                if (encryptionKey) {
-                    // Initialize database
-                    await window.electron.dbInitialize(userId, encryptionKey);
-
-                    // Navigate to main page
-                    window.location.href = '/';
-                }
-            } catch (error) {
-                console.error('[OfflineLogin] Error initializing database:', error);
+    async function handlePinSuccess(userId: string): Promise<void> {
+        try {
+            const encryptionKey = await tauri.getUserEncryptionKey(userId);
+            if (encryptionKey) {
+                await tauri.dbInitialize(userId, encryptionKey);
+                await tauri.loginSuccess();
             }
+        } catch (error) {
+            console.error('[OfflineLogin] Error initializing database:', error);
         }
     }
 
-    function handleBackToOnline():void {
-        if (window.electron) {
-            window.electron.logout();
-        }
+    function handleBackToOnline(): void {
+        tauri.logout();
     }
 
-    useEffect(():void => {
-        // Check if we have offline capability
+    useEffect((): void => {
         async function checkOfflineCapability() {
-            if (window.electron) {
-                const offlineStatus = await window.electron.offlineModeGet();
-                if (!offlineStatus.hasPin) {
-                    window.location.href = '/login/login';
-                }
+            const offlineStatus = await tauri.offlineModeGet();
+            if (!offlineStatus.hasPin) {
+                window.location.href = '/login/login';
             }
         }