fix: don't set session mode for standalone Claude CLI

When launching Claude Code CLI with --dangerously-skip-permissions,
don't set the terminal mode to 'session' since we're not attaching
to an existing session. Keep it in 'mixed' mode instead.

The "Invalid session" error occurred because:
1. We launched claude --dangerously-skip-permissions without a session
2. Then set mode to 'session' which expects a valid session attachment
3. The CLI or backend rejected this as invalid

Fix: Remove the setMode call when using claude-cli terminal type.
Let the CLI create and manage its own session internally.

Resolves: "Invalid session" error when selecting Claude Code CLI

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

public/claude-ide/terminal.js

@@ -224,8 +224,8 @@ class TerminalManager {
         // 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
         await this.launchCommand(terminalId, 'claude --dangerously-skip-permissions\n');
-        await this.setMode(terminalId, 'session');
 
         if (!silent) {
           showToast('Claude Code CLI terminal created', 'success');