test(03-12): RED — WR-07 focus trap Tab/Shift+Tab cycle tests

Add two failing tests for the focus trap:
- Tab from last focusable element must wrap to first inside dialog
- Shift+Tab from first focusable element must wrap to last inside dialog

Both fail today because EventForm only calls .focus() once on open;
Tab escapes the modal to background content.

apps/pwa/src/components/EventForm.test.tsx

@@ -616,4 +616,58 @@ describe('EventForm — Plan 03-12 gap closures', () => {
     // Should return a YYYY-MM-DD string
     expect(result).toMatch(/^\d{4}-\d{2}-\d{2}$/)
   })
+
+  // ── WR-07: Tab/Shift+Tab focus trap ──────────────────────────────────────
+  //
+  // The dialog must trap Tab focus: pressing Tab from the last focusable element
+  // wraps to the first, and Shift+Tab from the first wraps to the last.
+  // Today EventForm only calls .focus() once on open — Tab escapes the modal.
+
+  it('WR-07: Tab from last focusable element wraps focus to first inside dialog', () => {
+    renderForm({ mode: 'create' })
+
+    const dialog = screen.getByRole('dialog')
+    const focusable = Array.from(
+      dialog.querySelectorAll<HTMLElement>(
+        'button, [href], input, select, textarea, [tabindex]:not([tabindex="-1"])',
+      ),
+    )
+    expect(focusable.length).toBeGreaterThan(1)
+
+    const lastElement = focusable[focusable.length - 1]
+    const firstElement = focusable[0]
+
+    // Focus the last element, then dispatch Tab
+    lastElement.focus()
+    expect(document.activeElement).toBe(lastElement)
+
+    fireEvent.keyDown(dialog, { key: 'Tab', shiftKey: false })
+
+    // WR-07 fix: focus should have wrapped to first element inside dialog
+    expect(document.activeElement).toBe(firstElement)
+  })
+
+  it('WR-07: Shift+Tab from first focusable element wraps focus to last inside dialog', () => {
+    renderForm({ mode: 'create' })
+
+    const dialog = screen.getByRole('dialog')
+    const focusable = Array.from(
+      dialog.querySelectorAll<HTMLElement>(
+        'button, [href], input, select, textarea, [tabindex]:not([tabindex="-1"])',
+      ),
+    )
+    expect(focusable.length).toBeGreaterThan(1)
+
+    const firstElement = focusable[0]
+    const lastElement = focusable[focusable.length - 1]
+
+    // Focus the first element, then dispatch Shift+Tab
+    firstElement.focus()
+    expect(document.activeElement).toBe(firstElement)
+
+    fireEvent.keyDown(dialog, { key: 'Tab', shiftKey: true })
+
+    // WR-07 fix: focus should have wrapped to last element inside dialog
+    expect(document.activeElement).toBe(lastElement)
+  })
 })