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/main.ts

@@ -594,6 +594,34 @@ ipcMain.handle('shell:openPath', async (_, filePath: string) => {
   }
 });
 
+// Open file in editor (VS Code, etc.) with optional line/column
+ipcMain.handle(
+  'shell:openInEditor',
+  async (_, filePath: string, line?: number, column?: number) => {
+    try {
+      // Build VS Code URL scheme: vscode://file/path:line:column
+      // This works on all platforms where VS Code is installed
+      // URL encode the path to handle special characters (spaces, brackets, etc.)
+      // Handle both Unix (/) and Windows (\) path separators
+      const normalizedPath = filePath.replace(/\\/g, '/');
+      const encodedPath = normalizedPath.startsWith('/')
+        ? '/' + normalizedPath.slice(1).split('/').map(encodeURIComponent).join('/')
+        : normalizedPath.split('/').map(encodeURIComponent).join('/');
+      let url = `vscode://file${encodedPath}`;
+      if (line !== undefined && line > 0) {
+        url += `:${line}`;
+        if (column !== undefined && column > 0) {
+          url += `:${column}`;
+        }
+      }
+      await shell.openExternal(url);
+      return { success: true };
+    } catch (error) {
+      return { success: false, error: (error as Error).message };
+    }
+  }
+);
+
 // App info
 ipcMain.handle('app:getPath', async (_, name: Parameters<typeof app.getPath>[0]) => {
   return app.getPath(name);