Feature: Add PR review comments and resolution, improve AI prompt handling (#790)

* feat: Add PR review comments and resolution endpoints, improve prompt handling

* Feature: File Editor (#789)

* feat: Add file management feature

* feat: Add auto-save functionality to file editor

* fix: Replace HardDriveDownload icon with Save icon for consistency

* fix: Prevent recursive copy/move and improve shell injection prevention

* refactor: Extract editor settings form into separate component

* ```
fix: Improve error handling and stabilize async operations

- Add error event handlers to GraphQL process spawns to prevent unhandled rejections
- Replace execAsync with execFile for safer command execution and better control
- Fix timeout cleanup in withTimeout generator to prevent memory leaks
- Improve outdated comment detection logic by removing redundant condition
- Use resolveModelString for consistent model string handling
- Replace || with ?? for proper falsy value handling in dialog initialization
- Add comments clarifying branch name resolution logic for local branches with slashes
- Add catch handler for project selection to handle async errors gracefully
```

* refactor: Extract PR review comments logic to dedicated service

* fix: Improve robustness and UX for PR review and file operations

* fix: Consolidate exec utilities and improve type safety

* refactor: Replace ScrollArea with div and improve file tree layout

apps/server/src/routes/fs/routes/write.ts

@@ -24,7 +24,9 @@ export function createWriteHandler() {
 
       // Ensure parent directory exists (symlink-safe)
       await mkdirSafe(path.dirname(path.resolve(filePath)));
-      await secureFs.writeFile(filePath, content, 'utf-8');
+      // Default content to empty string if undefined/null to prevent writing
+      // "undefined" as literal text (e.g. when content field is missing from request)
+      await secureFs.writeFile(filePath, content ?? '', 'utf-8');
 
       res.json({ success: true });
     } catch (error) {