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/vscode/src/bridge-system-runtime.ts

@@ -51,8 +51,8 @@ const getOpenChamberConfigDir = (): string => {
   return path.join(os.homedir(), '.config', 'openchamber');
 };
 
-const sanitizeInstallScope = (scope: string): 'desktop-tauri' | 'vscode' | 'web' => {
-  if (scope === 'desktop-tauri' || scope === 'vscode' || scope === 'web') return scope;
+const sanitizeInstallScope = (scope: string): 'vscode' | 'web' => {
+  if (scope === 'vscode' || scope === 'web') return scope;
   return 'web';
 };
 

packages/vscode/src/extension.ts

@@ -683,7 +683,7 @@ export async function activate(context: vscode.ExtensionContext) {
       sessionEditorProvider?.updateConnectionStatus(status, error);
 
       // Start/stop global event watcher based on connection status
-      // Mirrors web server and desktop Tauri behavior
+      // Mirrors web server and desktop behavior
       if (status === 'connected' && chatViewProvider && openCodeManager) {
         setChatViewProvider(chatViewProvider);
         void startGlobalEventWatcher(openCodeManager, chatViewProvider);

packages/vscode/src/sessionActivityWatcher.ts

@@ -1,7 +1,7 @@
 import { createOpencodeClient } from '@opencode-ai/sdk/v2';
 import type { OpenCodeManager } from './opencode';
 
-// Session activity tracking (mirrors web server and desktop Tauri behavior)
+// Session activity tracking (mirrors web server and desktop behavior)
 type ActivityPhase = 'idle' | 'busy' | 'cooldown';
 
 interface SessionActivity {