chore: merge executor worktree (10-05 Nyquist stubs)

frontend/src/components/layout/__tests__/AppSidebar.empty.test.js

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+import { describe, it } from 'vitest'
+
+describe('UX-03: AppSidebar shows skeleton placeholders while loading', () => {
+  it.todo('renders skeleton rows in folder section when loadingRoots=true')
+  it.todo('renders skeleton rows in topics section when topicsStore.loading=true')
+  it.todo('renders skeleton rows in cloud section when loadingCloudConnections=true')
+  it.todo('Loading… text is removed from all three sections')
+})
+
+describe('UX-01 (sidebar micro): EmptyState size=sm appears when each section is empty', () => {
+  it.todo('folders empty: EmptyState size=sm with icon=folder')
+  it.todo('topics empty: EmptyState size=sm with icon=tag')
+  it.todo('cloud empty: EmptyState size=sm with icon=cloud and a Settings link in #cta')
+})
+
+describe('UX-14: AppSidebar no longer renders an inline "New" folder button', () => {
+  it.todo('no <button> with text "New" exists in the rendered template')
+  it.todo('startNewFolder/cancelNewFolder/submitNewFolder methods are removed')
+  it.todo('newFolderName/showNewFolderInput state is removed')
+})

frontend/src/components/layout/__tests__/OsDragOverlay.test.js

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+import { describe, it } from 'vitest'
+
+describe('UX-09: OsDragOverlay shows when OS files are dragged over the window', () => {
+  it.todo('overlay hidden by default (dragDepth=0)')
+  it.todo('dragenter with dataTransfer.types including "Files" shows overlay')
+  it.todo('dragenter without "Files" type is ignored (in-app element drag)')
+  it.todo('dragleave decrements depth; overlay hides when depth reaches 0')
+  it.todo('drop event emits files-dropped with the file list')
+  it.todo('drop resets dragDepth to 0 and hides overlay')
+  it.todo('overlay is teleported to body with z-[9998] (below toast z-[9999])')
+})

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

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+import { describe, it } from 'vitest'
+
+describe('UX-11: Drag-to-move document onto folder row', () => {
+  it.todo('dragOverFolderId set on @dragover applies bg-amber-50 ring-2 ring-inset ring-amber-300 to that folder row')
+  it.todo('drop on folder emits file-move with { fileId, folderId }')
+  it.todo('dragend resets draggingFile to null after nextTick (click-after-drag guard)')
+  it.todo('click on file row is suppressed when draggingFile is non-null')
+})
+
+describe('UX-11 (toast wiring): doMove emits toast', () => {
+  it.todo('successful moveToFolder triggers useToastStore.show("Document moved", "success")')
+  it.todo('failed moveToFolder triggers useToastStore.show("Move failed: ...", "error")')
+})

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

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+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')
+})

frontend/src/components/ui/__tests__/dropdown.test.js

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+import { describe, it } from 'vitest'
+
+describe('UX-13: Teleport + getBoundingClientRect dropdown pattern across components', () => {
+  it.todo('DocumentCard folder picker uses Teleport to body')
+  it.todo('DocumentCard folder picker position matches trigger getBoundingClientRect')
+  it.todo('FolderRow three-dot menu uses Teleport to body')
+  it.todo('FolderRow three-dot menu repositions on window scroll')
+})