fix: wait for WebSocket connection before sending command

Make connectTerminal() return a Promise that resolves when the
WebSocket connection is established, ensuring commands are sent
only after the terminal is ready.

Root cause:
- connectTerminal() created WebSocket but returned immediately
- 500ms delay wasn't reliable - WebSocket might not be open yet
- Command was sent before connection was ready, causing it to fail silently

Fix:
- Wrap WebSocket creation in Promise
- Resolve Promise in ws.onopen callback
- Reject on ws.onerror
- Remove unnecessary 500ms delay

Now when "Claude Code CLI" terminal type is selected:
1. WebSocket connection is established
2. We wait for connection to be ready
3. Command is sent immediately
4. claude --dangerously-skip-permissions launches reliably

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

public/claude-ide/terminal.js

@@ -221,10 +221,9 @@ class TerminalManager {
 
       // Handle terminal type specific initialization
       if (selectedTerminalType === 'claude-cli') {
-        // Wait a moment for terminal to be ready
-        await new Promise(resolve => setTimeout(resolve, 500));
         // Launch Claude CLI with skip permissions flag
         // Note: Keep mode as 'mixed' since we're not attaching to a session
+        // WebSocket is already connected (await connectTerminal), so no delay needed
         await this.launchCommand(terminalId, 'claude --dangerously-skip-permissions\n');
 
         if (!silent) {
@@ -768,11 +767,13 @@ class TerminalManager {
     const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
     const wsUrl = `${protocol}//${window.location.host}/claude/api/terminals/${terminalId}/ws`;
 
+    return new Promise((resolve, reject) => {
       try {
         const ws = new WebSocket(wsUrl);
 
         ws.onopen = () => {
           console.log(`[TerminalManager] Connected to terminal ${terminalId}`);
+          resolve();
         };
 
         ws.onmessage = (event) => {
@@ -782,6 +783,7 @@ class TerminalManager {
 
         ws.onerror = (error) => {
           console.error(`[TerminalManager] WebSocket error for terminal ${terminalId}:`, error);
+          reject(error);
         };
 
         ws.onclose = () => {
@@ -795,8 +797,9 @@ class TerminalManager {
         }
       } catch (error) {
         console.error('[TerminalManager] Error connecting WebSocket:', error);
-      throw error;
+        reject(error);
       }
+    });
   }
 
   /**