feat(editor): add markdown presets, heading folding and external file refresh

frontend/src/stores/editorSave.spec.ts

@@ -6,6 +6,30 @@ import * as workspace from '@/services/workspaceService'
 
 afterEach(() => { vi.restoreAllMocks(); vi.useRealTimers() })
 
+it('reloads clean external changes but preserves unsaved edits and blocks overwrite', async () => {
+  setActivePinia(createPinia())
+  vi.spyOn(workspace, 'getNoteId').mockResolvedValue('id')
+  const read = vi.spyOn(workspace, 'readFileContent').mockResolvedValue('original')
+  const write = vi.spyOn(workspace, 'saveFileContent').mockResolvedValue()
+  const store = useEditorStore()
+  await store.loadFile('/draft.md')
+  read.mockResolvedValue('external')
+  await store.checkExternalFile()
+  expect(store.content).toBe('external')
+  expect(store.contentRevision).toBe(1)
+  store.updateContent('my unsaved changes')
+  read.mockResolvedValue('new external')
+  await store.checkExternalFile()
+  expect(store.saveStatus).toBe('conflict')
+  expect(store.content).toBe('my unsaved changes')
+  store.updateContent('keep editing')
+  await store.save()
+  expect(write).not.toHaveBeenCalled()
+  await store.reloadExternalFile()
+  expect(store.content).toBe('new external')
+  expect(store.saveStatus).toBe('saved')
+})
+
 it('saves text typed while the previous save is still pending', async () => {
   vi.useFakeTimers()
   setActivePinia(createPinia())
@@ -20,6 +44,6 @@ it('saves text typed while the previous save is still pending', async () => {
   await saving
   expect(store.saveStatus).toBe('dirty')
   await vi.advanceTimersByTimeAsync(1500)
-  expect(write).toHaveBeenLastCalledWith('/draft.md', 'latest')
+  expect(write).toHaveBeenLastCalledWith('/draft.md', 'latest', 'first')
   expect(store.saveStatus).toBe('saved')
 })