test(10-05): Wave 0 skeleton + dropdown stubs (UX-02, UX-03, UX-04, UX-13, UX-14)

- StorageBrowser.skeleton.test.js: 7 it.todo stubs for UX-02 skeleton rows + UX-13 Teleport dropdown
- AppSidebar.empty.test.js: 10 it.todo stubs for UX-03 skeleton, UX-01 micro empty states, UX-14 inline-New removal
- AdminAuditView.skeleton.test.js: 5 it.todo stubs for UX-04 audit skeleton + UX-01 empty state
- AdminUsersView.skeleton.test.js: 3 it.todo stubs for UX-04 users skeleton
- dropdown.test.js: 4 it.todo stubs for UX-13 Teleport+getBoundingClientRect pattern

frontend/src/components/storage/__tests__/StorageBrowser.skeleton.test.js

@@ -0,0 +1,14 @@
+import { describe, it } from 'vitest'
+
+describe('UX-02: StorageBrowser shows skeleton rows during loading', () => {
+  it.todo('renders 5+ skeleton rows when loading=true (replaces Loading… text)')
+  it.todo('skeleton rows use grid-cols-[2rem_1fr_6rem_8rem_6rem] matching real row grid')
+  it.todo('skeleton rows use animate-pulse')
+  it.todo('Loading… text is absent when loading=true (skeleton replaces it)')
+})
+
+describe('UX-13: StorageBrowser folder picker uses Teleport + getBoundingClientRect', () => {
+  it.todo('folder picker dropdown is teleported to body (escapes overflow container)')
+  it.todo('dropdown position reflects getBoundingClientRect of the trigger button')
+  it.todo('window scroll while open recalculates position')
+})