feat(cli): implement Claude CLI detection and model selection for features

- Added a new service to detect the installation status of Claude Code CLI, providing users with installation recommendations and commands.
- Integrated CLI detection into the SettingsView to inform users about the CLI status and its benefits for ultrathink tasks.
- Enhanced feature creation and editing dialogs to allow users to select from multiple models (Haiku, Sonnet, Opus) and specify thinking levels (None, Low, Medium, High, Ultrathink).
- Updated the feature executor to utilize the selected model and thinking configuration during task execution, improving flexibility and performance.

This update enhances user experience by providing clearer options for model selection and ensuring optimal performance with the Claude CLI.

🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4 <noreply@anthropic.com>

app/electron/services/claude-cli-detector.js

@@ -0,0 +1,119 @@
+const { execSync } = require('child_process');
+const fs = require('fs');
+const path = require('path');
+const os = require('os');
+
+class ClaudeCliDetector {
+  /**
+   * Check if Claude Code CLI is installed and accessible
+   * @returns {Object} { installed: boolean, path: string|null, version: string|null, method: 'cli'|'sdk'|'none' }
+   */
+  static detectClaudeInstallation() {
+    try {
+      // Method 1: Check if 'claude' command is in PATH
+      try {
+        const claudePath = execSync('which claude', { encoding: 'utf-8' }).trim();
+        const version = execSync('claude --version', { encoding: 'utf-8' }).trim();
+        return {
+          installed: true,
+          path: claudePath,
+          version: version,
+          method: 'cli'
+        };
+      } catch (error) {
+        // CLI not in PATH, check local installation
+      }
+
+      // Method 2: Check for local installation
+      const localClaudePath = path.join(os.homedir(), '.claude', 'local', 'claude');
+      if (fs.existsSync(localClaudePath)) {
+        try {
+          const version = execSync(`${localClaudePath} --version`, { encoding: 'utf-8' }).trim();
+          return {
+            installed: true,
+            path: localClaudePath,
+            version: version,
+            method: 'cli-local'
+          };
+        } catch (error) {
+          // Local CLI exists but may not be executable
+        }
+      }
+
+      // Method 3: Check Windows path
+      if (process.platform === 'win32') {
+        try {
+          const claudePath = execSync('where claude', { encoding: 'utf-8' }).trim();
+          const version = execSync('claude --version', { encoding: 'utf-8' }).trim();
+          return {
+            installed: true,
+            path: claudePath,
+            version: version,
+            method: 'cli'
+          };
+        } catch (error) {
+          // Not found
+        }
+      }
+
+      // Method 4: SDK mode (using OAuth token)
+      if (process.env.CLAUDE_CODE_OAUTH_TOKEN) {
+        return {
+          installed: true,
+          path: null,
+          version: 'SDK Mode',
+          method: 'sdk'
+        };
+      }
+
+      return {
+        installed: false,
+        path: null,
+        version: null,
+        method: 'none'
+      };
+    } catch (error) {
+      console.error('[ClaudeCliDetector] Error detecting Claude installation:', error);
+      return {
+        installed: false,
+        path: null,
+        version: null,
+        method: 'none',
+        error: error.message
+      };
+    }
+  }
+
+  /**
+   * Get installation recommendations
+   */
+  static getInstallationInfo() {
+    const detection = this.detectClaudeInstallation();
+    
+    if (detection.installed) {
+      return {
+        status: 'installed',
+        method: detection.method,
+        version: detection.version,
+        path: detection.path,
+        recommendation: detection.method === 'cli' 
+          ? 'Using Claude Code CLI - optimal for long-running tasks'
+          : 'Using SDK mode - works well but CLI may provide better performance'
+      };
+    }
+
+    return {
+      status: 'not_installed',
+      recommendation: 'Consider installing Claude Code CLI for better performance with ultrathink',
+      installCommands: {
+        macos: 'curl -fsSL claude.ai/install.sh | bash',
+        windows: 'irm https://claude.ai/install.ps1 | iex',
+        linux: 'curl -fsSL claude.ai/install.sh | bash',
+        npm: 'npm install -g @anthropic-ai/claude-code'
+      }
+    };
+  }
+}
+
+module.exports = ClaudeCliDetector;
+