Re-run setup and cleanup scripts (#1981)

## Summary

I've implemented the "re-run setup/cleanup script" functionality in the new UI command bar. The changes include:

### Files Modified

1. **`frontend/src/components/ui-new/actions/index.ts`**
   - Added `isAttemptRunning: boolean` to `ActionVisibilityContext` interface (line 109)
   - Added `RunSetupScript` and `RunCleanupScript` workspace actions (lines 737-777)
   - Both actions use the existing `attemptsApi.runSetupScript/runCleanupScript` methods
   - Actions are disabled when `isAttemptRunning` is true
   - Error handling for `no_script_configured` and `process_already_running` errors

2. **`frontend/src/components/ui-new/actions/useActionVisibility.ts`**
   - Import `useExecutionProcessesContext`
   - Added `isAttemptRunningVisible` to the hook call
   - Added `isAttemptRunning: isAttemptRunningVisible` to the returned context

3. **`frontend/src/components/ui-new/actions/pages.ts`**
   - Added a new "Scripts" group to the `workspaceActions` page containing both actions

### Testing

The dev server is running at:
- Frontend: http://localhost:3000/
- Backend: http://127.0.0.1:3001

To test:
1. Navigate to the new UI (`/workspaces`)
2. Select a workspace
3. Open the command bar (CMD+K)
4. Navigate to "Workspace Actions"
5. You should see a "Scripts" group with "Run Setup Script" and "Run Cleanup Script" options

frontend/src/components/ui-new/actions/index.ts

@@ -104,6 +104,9 @@ export interface ActionVisibilityContext {
   hasMultipleRepos: boolean;
   hasOpenPR: boolean;
   hasUnpushedCommits: boolean;
+
+  // Execution state
+  isAttemptRunning: boolean;
 }
 
 // Base properties shared by all actions
@@ -729,6 +732,49 @@ export const Actions = {
       invalidateWorkspaceQueries(ctx.queryClient, workspaceId);
     },
   },
+
+  // === Script Actions ===
+  RunSetupScript: {
+    id: 'run-setup-script',
+    label: 'Run Setup Script',
+    icon: TerminalIcon,
+    requiresTarget: true,
+    isVisible: (ctx) => ctx.hasWorkspace,
+    isEnabled: (ctx) => !ctx.isAttemptRunning,
+    execute: async (_ctx, workspaceId) => {
+      const result = await attemptsApi.runSetupScript(workspaceId);
+      if (!result.success) {
+        if (result.error?.type === 'no_script_configured') {
+          throw new Error('No setup script configured for this project');
+        }
+        if (result.error?.type === 'process_already_running') {
+          throw new Error('Cannot run script while another process is running');
+        }
+        throw new Error('Failed to run setup script');
+      }
+    },
+  },
+
+  RunCleanupScript: {
+    id: 'run-cleanup-script',
+    label: 'Run Cleanup Script',
+    icon: TerminalIcon,
+    requiresTarget: true,
+    isVisible: (ctx) => ctx.hasWorkspace,
+    isEnabled: (ctx) => !ctx.isAttemptRunning,
+    execute: async (_ctx, workspaceId) => {
+      const result = await attemptsApi.runCleanupScript(workspaceId);
+      if (!result.success) {
+        if (result.error?.type === 'no_script_configured') {
+          throw new Error('No cleanup script configured for this project');
+        }
+        if (result.error?.type === 'process_already_running') {
+          throw new Error('Cannot run script while another process is running');
+        }
+        throw new Error('Failed to run cleanup script');
+      }
+    },
+  },
 } as const satisfies Record<string, ActionDefinition>;
 
 // Helper to resolve dynamic label