Merge main into kanban-scaling

Resolves merge conflicts while preserving:
- Kanban scaling improvements (window sizing, bounce prevention, debouncing)
- Main's sidebar refactoring into hooks
- Main's openInEditor functionality for VS Code integration

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

apps/ui/src/preload.ts

@@ -32,6 +32,12 @@ contextBridge.exposeInMainWorld('electronAPI', {
     ipcRenderer.invoke('shell:openExternal', url),
   openPath: (filePath: string): Promise<{ success: boolean; error?: string }> =>
     ipcRenderer.invoke('shell:openPath', filePath),
+  openInEditor: (
+    filePath: string,
+    line?: number,
+    column?: number
+  ): Promise<{ success: boolean; error?: string }> =>
+    ipcRenderer.invoke('shell:openInEditor', filePath, line, column),
 
   // App info
   getPath: (name: string): Promise<string> => ipcRenderer.invoke('app:getPath', name),