Add settings UI with WSL configuration support

- Add settings button to webview UI
- Implement settings panel with WSL bridge configuration
- Add real-time settings updates via VS Code configuration API
- Support for WSL distro, node path, and claude path configuration
- Improve user experience by eliminating manual config file editing

TEST_SETTINGS.md

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+# Settings Interface Test Plan
+
+## Overview
+Added a settings interface to the Claude Code Chat webview that allows users to configure WSL settings.
+
+## Changes Made
+
+### 1. UI Changes (ui.ts)
+- Added a settings button (⚙️) in the header that's always visible
+- Created a settings modal with WSL configuration options:
+  - Enable WSL Integration checkbox
+  - WSL Distribution input field
+  - Node.js Path in WSL input field
+  - Claude Path in WSL input field
+- Added JavaScript functions:
+  - `toggleSettings()` - Shows/hides the settings modal
+  - `hideSettingsModal()` - Hides the settings modal
+  - `updateSettings()` - Sends settings changes to VS Code
+  - Event listeners for modal interaction
+
+### 2. Extension Changes (extension.ts)
+- Added message handlers:
+  - `getSettings` - Retrieves current settings from VS Code configuration
+  - `updateSettings` - Updates VS Code configuration with new settings
+- Added methods:
+  - `_sendCurrentSettings()` - Sends current settings to webview
+  - `_updateSettings()` - Updates VS Code configuration
+
+### 3. Configuration (package.json)
+- Already has WSL configuration properties defined:
+  - `claudeCodeChat.wsl.enabled`
+  - `claudeCodeChat.wsl.distro`
+  - `claudeCodeChat.wsl.nodePath`
+  - `claudeCodeChat.wsl.claudePath`
+
+## Testing Steps
+
+1. Open VS Code with the extension
+2. Open Claude Code Chat (Ctrl+Shift+C)
+3. Click the settings button (⚙️) in the header
+4. Verify the settings modal appears
+5. Check that current WSL settings are loaded
+6. Toggle "Enable WSL Integration" and verify:
+   - WSL options show/hide accordingly
+   - Settings are saved when changed
+7. Modify WSL settings and verify they persist
+8. Close and reopen the settings to confirm values are saved
+
+## Features
+
+- Settings button is always visible in the header
+- Modal design matches the existing tools modal
+- Real-time show/hide of WSL options based on enabled state
+- Settings persist across sessions
+- Success/error notifications when saving settings