fix(frontend): a11y on clickable rows + correct c2 source field + pill metric alignment (sprint 8 design-review)

F1: add tabIndex/role/onKeyDown/aria-expanded to C2TasksPanel expander rows and
    C2CallbackPicker callback rows; focus-visible ring via Tailwind utilities
F2: add source:'mimic'|'import' to C2TaskListItem; C2TasksPanel reads task.source
    instead of mapping_applied for the Source badge label
F3: align C2TaskStatusBadge and C2CallbackPicker Active/Inactive pill metrics to
    py-[6px] text-[14px] font-medium (matches SimulationStatusBadge / StatusBadge)
F4: replace hand-rolled Source pill class string with badge-pill-outline recipe
Tests: 212/212 passing (+3 new: Enter/Space key on expander, Enter key on callback row)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/tests/SimulationFormPage.test.tsx

@@ -388,6 +388,7 @@ describe('SimulationFormPage — C2 tasks panel visibility', () => {
           completed: true,
           output: 'SYSTEM',
           mapping_applied: false,
+          source: 'import',
           created_at: '2026-06-10T10:00:00',
           completed_at: '2026-06-10T10:00:05',
         },

frontend/tests/api/c2.test.ts

@@ -152,6 +152,7 @@ describe('getC2Tasks', () => {
           completed: true,
           output: 'NT AUTHORITY\\SYSTEM',
           mapping_applied: true,
+          source: 'mimic',
           created_at: '2026-06-10T10:00:00',
           completed_at: '2026-06-10T10:00:05',
         },

frontend/tests/components/C2TasksPanel.test.tsx

@@ -28,6 +28,7 @@ const COMPLETED_TASK = {
   completed: true,
   output: 'NT AUTHORITY\\SYSTEM',
   mapping_applied: true,
+  source: 'mimic' as const,
   created_at: '2026-06-10T10:00:00',
   completed_at: '2026-06-10T10:00:05',
 };
@@ -42,6 +43,7 @@ const PENDING_TASK = {
   completed: false,
   output: null,
   mapping_applied: false,
+  source: 'import' as const,
   created_at: '2026-06-10T10:00:10',
   completed_at: null,
 };
@@ -91,14 +93,14 @@ describe('C2TasksPanel — populated rows', () => {
     });
   });
 
-  it('shows MIMIC source badge for mapping_applied=true', async () => {
+  it('shows MIMIC source badge for source=mimic', async () => {
     renderWithProviders(<C2TasksPanel simulationId={7} />);
     await waitFor(() => {
       expect(screen.getByText('MIMIC')).toBeInTheDocument();
     });
   });
 
-  it('shows IMPORT source badge for mapping_applied=false', async () => {
+  it('shows IMPORT source badge for source=import', async () => {
     renderWithProviders(<C2TasksPanel simulationId={7} />);
     await waitFor(() => {
       expect(screen.getByText('IMPORT')).toBeInTheDocument();
@@ -163,6 +165,28 @@ describe('C2TasksPanel — expand on click', () => {
     fireEvent.click(screen.getByTestId('c2-task-row'));
     expect(screen.queryByTestId('c2-task-output')).toBeNull();
   });
+
+  it('Enter key on completed row toggles output (a11y)', async () => {
+    renderWithProviders(<C2TasksPanel simulationId={7} />);
+    await waitFor(() => {
+      expect(screen.getAllByTestId('c2-task-row')).toHaveLength(1);
+    });
+    const row = screen.getByTestId('c2-task-row');
+    fireEvent.keyDown(row, { key: 'Enter' });
+    expect(screen.getByTestId('c2-task-output')).toBeInTheDocument();
+    fireEvent.keyDown(row, { key: 'Enter' });
+    expect(screen.queryByTestId('c2-task-output')).toBeNull();
+  });
+
+  it('Space key on completed row toggles output (a11y)', async () => {
+    renderWithProviders(<C2TasksPanel simulationId={7} />);
+    await waitFor(() => {
+      expect(screen.getAllByTestId('c2-task-row')).toHaveLength(1);
+    });
+    const row = screen.getByTestId('c2-task-row');
+    fireEvent.keyDown(row, { key: ' ' });
+    expect(screen.getByTestId('c2-task-output')).toBeInTheDocument();
+  });
 });
 
 describe('C2TasksPanel — refresh indicator', () => {

frontend/tests/components/ExecuteViaC2Modal.test.tsx

@@ -157,4 +157,15 @@ describe('ExecuteViaC2Modal', () => {
     const textarea = screen.getByTestId('c2-commands-textarea') as HTMLTextAreaElement;
     expect(textarea.value).toBe('net user\nwhoami /all');
   });
+
+  it('Enter key on callback row selects it (a11y)', async () => {
+    renderModal('whoami');
+    await waitFor(() => {
+      expect(screen.getAllByTestId('c2-callback-row')).toHaveLength(2);
+    });
+    const firstRow = screen.getAllByTestId('c2-callback-row')[0];
+    fireEvent.keyDown(firstRow, { key: 'Enter' });
+    // Row is now selected → Launch button should be enabled
+    expect(screen.getByTestId('c2-launch-btn')).not.toBeDisabled();
+  });
 });