fix(vscode-ide-companion): resolve ESLint errors and improve code quality

- Fix unused variable issues by removing unused variables and renaming caught errors to match ESLint rules
- Fix TypeScript type mismatches in mode handling
- Add missing curly braces to if statements to comply with ESLint rules
- Resolve missing dependency warnings in React hooks
- Clean up empty catch blocks by adding appropriate comments
- Remove unused _lastEditorState variables that were declared but never read

These changes ensure the codebase passes ESLint checks and follows best practices for code quality.

packages/vscode-ide-companion/src/webview/handlers/SettingsMessageHandler.ts

@@ -92,7 +92,13 @@ export class SettingsMessageHandler extends BaseMessageHandler {
         | 'auto-edit'
         | 'yolo';
       await this.agentManager.setApprovalModeFromUi(
-        modeId === 'plan' ? 'plan' : modeId === 'auto-edit' ? 'auto' : 'ask',
+        modeId === 'plan'
+          ? 'plan'
+          : modeId === 'auto-edit'
+            ? 'auto'
+            : modeId === 'yolo'
+              ? 'yolo'
+              : 'ask',
       );
       // No explicit response needed; WebView listens for modeChanged
     } catch (error) {