debug: add switchToTerminal logging and fitAddon error handling

- Log when switchToTerminal is called and if terminal is in map
- Log fitAddon.fit() execution with error handling
- Log when switchToTerminal completes

This will help identify if switchToTerminal is causing the WebSocket closure

public/claude-ide/terminal.js

@@ -1140,6 +1140,8 @@ class TerminalManager {
    * Switch to specific terminal
    */
   async switchToTerminal(terminalId) {
+    this.debugLog('INIT', `switchToTerminal called for ${terminalId}, checking if terminal in map...`);
+
     // Hide all containers and remove active class
     document.querySelectorAll('.terminal-container').forEach(c => {
       c.classList.remove('active');
@@ -1159,13 +1161,27 @@ class TerminalManager {
 
       // Initialize xterm.js if not already done
       if (!this.terminals.has(terminalId)) {
+        this.debugLog('INIT', `Terminal ${terminalId} NOT in map, calling initializeXTerm...`);
         await this.initializeXTerm(terminalId);
+      } else {
+        this.debugLog('INIT', `Terminal ${terminalId} already in map, skipping initialization`);
       }
 
       // Fit terminal
       const terminal = this.terminals.get(terminalId);
       if (terminal && terminal.fitAddon) {
-        setTimeout(() => terminal.fitAddon.fit(), 100);
+        this.debugLog('INIT', `Calling fitAddon.fit() for ${terminalId} in 100ms...`);
+        setTimeout(() => {
+          this.debugLog('INIT', `Executing fitAddon.fit() for ${terminalId}`);
+          try {
+            terminal.fitAddon.fit();
+            this.debugLog('INIT', `fitAddon.fit() completed for ${terminalId}`);
+          } catch (error) {
+            this.debugLog('ERROR', `fitAddon.fit() failed for ${terminalId}`, { error: error.message });
+          }
+        }, 100);
+      } else {
+        this.debugLog('INIT', `No fitAddon for terminal ${terminalId} (terminal=${!!terminal}, fitAddon=${!!terminal?.fitAddon})`);
       }
     }
 
@@ -1175,6 +1191,7 @@ class TerminalManager {
       tab.classList.add('active');
     }
 
+    this.debugLog('INIT', `switchToTerminal completed for ${terminalId}`);
     this.activeTerminalId = terminalId;
   }