refactor: remove legacy Tauri desktop support

Electron updater now uses Electron release metadata only
Removed legacy Tauri package and migration workflow
Replaced Tauri shim usage with the desktop bridge

packages/ui/src/stores/useOpenInAppsStore.ts

@@ -1,6 +1,6 @@
 import { create } from 'zustand';
 
-import { fetchDesktopInstalledApps, isDesktopLocalOriginActive, isTauriShell, type DesktopSettings, type InstalledDesktopAppInfo } from '@/lib/desktop';
+import { fetchDesktopInstalledApps, isDesktopLocalOriginActive, isDesktopShell, type DesktopSettings, type InstalledDesktopAppInfo } from '@/lib/desktop';
 import { OPEN_IN_APPS, DEFAULT_OPEN_IN_APP_ID, OPEN_IN_ALWAYS_AVAILABLE_APP_IDS, getOpenInAppById, getPlatformOpenInApp, type OpenInApp } from '@/lib/openInApps';
 import { updateDesktopSettings } from '@/lib/persistence';
 
@@ -86,7 +86,7 @@ export const useOpenInAppsStore = create<OpenInAppsState>()((set, get) => ({
     };
 
     const loadInstalledApps = async (force?: boolean) => {
-      if (!isTauriShell() || !isDesktopLocalOriginActive()) {
+      if (!isDesktopShell() || !isDesktopLocalOriginActive()) {
         return;
       }
 
@@ -213,7 +213,7 @@ export const useOpenInAppsStore = create<OpenInAppsState>()((set, get) => ({
       get().initialize();
     }
 
-    if (!isTauriShell() || !isDesktopLocalOriginActive()) {
+    if (!isDesktopShell() || !isDesktopLocalOriginActive()) {
       return;
     }
 

packages/ui/src/stores/useUpdateStore.ts

@@ -8,7 +8,6 @@ import {
   restartToApplyUpdate,
   isDesktopLocalOriginActive,
   isElectronShell,
-  isTauriShell,
   isVSCodeRuntime,
   isWebRuntime,
 } from '@/lib/desktop';
@@ -83,7 +82,7 @@ function mapRuntimeParams(runtime: ClientRuntime): URLSearchParams {
   params.set('arch', detectArch());
   params.set('platform', detectPlatform());
   if (runtime === 'desktop') {
-    params.set('appType', isElectronShell() ? 'desktop-electron' : 'desktop-tauri');
+    params.set('appType', 'desktop-electron');
     params.set('instanceMode', isDesktopLocalOriginActive() ? 'local' : 'remote');
     return params;
   }
@@ -136,7 +135,7 @@ async function checkForWebUpdates(runtime: ClientRuntime, currentVersion?: strin
 }
 
 function detectRuntimeType(): 'desktop' | 'web' | 'vscode' | null {
-  if (isTauriShell()) {
+  if (isElectronShell()) {
     return 'desktop';
   }
   if (isVSCodeRuntime()) return 'vscode';