fix: hide legacy title chrome for frontmatter titles

src/components/editor-content/editorContentState.test.ts

@@ -62,6 +62,26 @@ describe('deriveEditorContentState', () => {
       content: '---\ntitle: Legacy Project\n---\nBody without a heading',
     })
 
+    expect(state.hasH1).toBe(false)
+    expect(state.showTitleSection).toBe(false)
+  })
+
+  it('hides the legacy title section when a frontmatter title drives the display title', () => {
+    const state = deriveState({
+      entry: baseEntry,
+      content: '---\ntitle: Spring 2026\nstatus: Active\n---\n## Goals',
+    })
+
+    expect(state.hasH1).toBe(false)
+    expect(state.showTitleSection).toBe(false)
+  })
+
+  it('keeps the title section when the document title still comes from the filename', () => {
+    const state = deriveState({
+      entry: baseEntry,
+      content: '---\nstatus: Active\n---\nBody without a heading',
+    })
+
     expect(state.hasH1).toBe(false)
     expect(state.showTitleSection).toBe(true)
   })

src/components/editor-content/editorContentState.ts

@@ -1,5 +1,5 @@
 import type { NoteStatus, VaultEntry } from '../../types'
-import { extractH1TitleFromContent } from '../../utils/noteTitle'
+import { contentDefinesDisplayTitle, extractH1TitleFromContent } from '../../utils/noteTitle'
 import { countWords } from '../../utils/wikilinks'
 
 export interface EditorContentTab {
@@ -14,6 +14,19 @@ interface EditorContentStateInput {
   activeStatus: NoteStatus
 }
 
+interface TitleSectionState {
+  hasDisplayTitle: boolean
+  hasH1: boolean
+}
+
+interface VisibilityState {
+  effectiveRawMode: boolean
+  isDeletedPreview: boolean
+  isNonMarkdownText: boolean
+  showEditor: boolean
+  showTitleSection: boolean
+}
+
 export interface EditorContentState {
   freshEntry: VaultEntry | undefined
   isArchived: boolean
@@ -36,10 +49,53 @@ function contentHasTopLevelH1(activeTab: EditorContentTab | null): boolean {
   return activeTab ? extractH1TitleFromContent(activeTab.content) !== null : false
 }
 
+function contentDefinesTitle(activeTab: EditorContentTab | null): boolean {
+  return activeTab ? contentDefinesDisplayTitle(activeTab.content) : false
+}
+
 function resolveHasH1(activeTab: EditorContentTab | null, freshEntry: VaultEntry | undefined): boolean {
   return contentHasTopLevelH1(activeTab) || freshEntry?.hasH1 === true || activeTab?.entry.hasH1 === true
 }
 
+function resolveHasDisplayTitle(activeTab: EditorContentTab | null, hasH1: boolean): boolean {
+  return hasH1 || contentDefinesTitle(activeTab)
+}
+
+function deriveTitleSectionState(activeTab: EditorContentTab | null, freshEntry: VaultEntry | undefined): TitleSectionState {
+  const hasH1 = resolveHasH1(activeTab, freshEntry)
+  return {
+    hasDisplayTitle: resolveHasDisplayTitle(activeTab, hasH1),
+    hasH1,
+  }
+}
+
+function deriveVisibilityState(input: {
+  activeStatus: NoteStatus
+  activeTab: EditorContentTab | null
+  freshEntry: VaultEntry | undefined
+  hasDisplayTitle: boolean
+  rawMode: boolean
+}): VisibilityState {
+  const {
+    activeStatus,
+    activeTab,
+    freshEntry,
+    hasDisplayTitle,
+    rawMode,
+  } = input
+  const isDeletedPreview = !!activeTab && !freshEntry
+  const isNonMarkdownText = activeTab?.entry.fileKind === 'text'
+  const effectiveRawMode = rawMode || isNonMarkdownText
+
+  return {
+    isDeletedPreview,
+    isNonMarkdownText,
+    effectiveRawMode,
+    showEditor: !effectiveRawMode,
+    showTitleSection: !isDeletedPreview && !hasDisplayTitle && !isUnsavedUntitledDraft(activeTab, activeStatus),
+  }
+}
+
 function isUnsavedUntitledDraft(activeTab: EditorContentTab | null, activeStatus: NoteStatus): boolean {
   if (!activeTab) return false
   if (!activeTab.entry.filename.startsWith('untitled-')) return false
@@ -53,22 +109,20 @@ export function deriveEditorContentState({
   activeStatus,
 }: EditorContentStateInput): EditorContentState {
   const freshEntry = findFreshEntry(activeTab, entries)
-  const isDeletedPreview = !!activeTab && !freshEntry
-  const hasH1 = resolveHasH1(activeTab, freshEntry)
-  const isNonMarkdownText = activeTab?.entry.fileKind === 'text'
-  const effectiveRawMode = rawMode || isNonMarkdownText
-  const showEditor = !effectiveRawMode
-  const showTitleSection = !isDeletedPreview && !hasH1 && !isUnsavedUntitledDraft(activeTab, activeStatus)
+  const titleState = deriveTitleSectionState(activeTab, freshEntry)
+  const visibilityState = deriveVisibilityState({
+    activeStatus,
+    activeTab,
+    freshEntry,
+    hasDisplayTitle: titleState.hasDisplayTitle,
+    rawMode,
+  })
 
   return {
     freshEntry,
     isArchived: freshEntry?.archived ?? activeTab?.entry.archived ?? false,
-    hasH1,
-    isDeletedPreview,
-    isNonMarkdownText,
-    effectiveRawMode,
-    showEditor,
-    showTitleSection,
+    hasH1: titleState.hasH1,
+    ...visibilityState,
     path: activeTab?.entry.path ?? '',
     wordCount: activeTab ? countWords(activeTab.content) : 0,
   }