feat: show archived note indicator banner in editor (#183)

Adds a subtle ArchivedNoteBanner component below the breadcrumb bar
when a note is archived. Banner includes:
- Muted gray background with archive icon + 'Archived' label
- 'Unarchive' button (ArrowUUpLeft icon) wired to same handler as Cmd+E
- Keyboard hint shown in button title

Editor remains fully editable (banner is purely informational).
Indicator appears/disappears reactively via entry.archived from store.

Co-authored-by: Test <test@test.com>

design/archived-note-indicator.pen

@@ -0,0 +1 @@
+{"children":[],"variables":{}}

src/components/ArchivedNoteBanner.test.tsx

@@ -0,0 +1,26 @@
+import { render, screen, fireEvent } from '@testing-library/react'
+import { describe, it, expect, vi } from 'vitest'
+import { ArchivedNoteBanner } from './ArchivedNoteBanner'
+
+describe('ArchivedNoteBanner', () => {
+  it('renders archive icon and label', () => {
+    render(<ArchivedNoteBanner onUnarchive={vi.fn()} />)
+    expect(screen.getByTestId('archived-note-banner')).toBeTruthy()
+    expect(screen.getByText('Archived')).toBeTruthy()
+  })
+
+  it('renders unarchive button with keyboard hint', () => {
+    render(<ArchivedNoteBanner onUnarchive={vi.fn()} />)
+    const btn = screen.getByTestId('unarchive-btn')
+    expect(btn).toBeTruthy()
+    expect(btn.textContent).toContain('Unarchive')
+    expect(btn.title).toBe('Unarchive (Cmd+E)')
+  })
+
+  it('calls onUnarchive when button is clicked', () => {
+    const onUnarchive = vi.fn()
+    render(<ArchivedNoteBanner onUnarchive={onUnarchive} />)
+    fireEvent.click(screen.getByTestId('unarchive-btn'))
+    expect(onUnarchive).toHaveBeenCalledOnce()
+  })
+})

src/components/ArchivedNoteBanner.tsx

@@ -0,0 +1,48 @@
+import { Archive, ArrowUUpLeft } from '@phosphor-icons/react'
+
+interface ArchivedNoteBannerProps {
+  onUnarchive: () => void
+}
+
+export function ArchivedNoteBanner({ onUnarchive }: ArchivedNoteBannerProps) {
+  return (
+    <div
+      data-testid="archived-note-banner"
+      style={{
+        display: 'flex',
+        alignItems: 'center',
+        gap: 6,
+        padding: '4px 16px',
+        background: 'var(--muted)',
+        borderBottom: '1px solid var(--border)',
+        fontSize: 12,
+        color: 'var(--muted-foreground)',
+        flexShrink: 0,
+      }}
+    >
+      <Archive size={13} weight="bold" />
+      <span>Archived</span>
+      <button
+        data-testid="unarchive-btn"
+        onClick={onUnarchive}
+        style={{
+          display: 'inline-flex',
+          alignItems: 'center',
+          gap: 4,
+          marginLeft: 'auto',
+          padding: '2px 8px',
+          background: 'transparent',
+          border: '1px solid var(--border)',
+          borderRadius: 4,
+          fontSize: 11,
+          color: 'var(--muted-foreground)',
+          cursor: 'pointer',
+        }}
+        title="Unarchive (Cmd+E)"
+      >
+        <ArrowUUpLeft size={12} />
+        Unarchive
+      </button>
+    </div>
+  )
+}

src/components/EditorContent.tsx

@@ -3,6 +3,7 @@ import type { useCreateBlockNote } from '@blocknote/react'
 import { DiffView } from './DiffView'
 import { BreadcrumbBar } from './BreadcrumbBar'
 import { TrashedNoteBanner } from './TrashedNoteBanner'
+import { ArchivedNoteBanner } from './ArchivedNoteBanner'
 import { RawEditorView } from './RawEditorView'
 import { countWords } from '../utils/wikilinks'
 import { SingleEditorView } from './SingleEditorView'
@@ -173,6 +174,9 @@ export function EditorContent({
           onDeletePermanently={() => onDeleteNote?.(activeTab.entry.path)}
         />
       )}
+      {activeTab?.entry.archived && breadcrumbProps.onUnarchiveNote && (
+        <ArchivedNoteBanner onUnarchive={() => breadcrumbProps.onUnarchiveNote!(activeTab.entry.path)} />
+      )}
       <EditorBody activeTab={activeTab} isLoadingNewTab={isLoadingNewTab} entries={entries} editor={editor} diffMode={diffMode} diffContent={diffContent} onToggleDiff={onToggleDiff} rawMode={rawMode} onRawContentChange={onRawContentChange} onSave={onSave} onNavigateWikilink={onNavigateWikilink} onEditorChange={onEditorChange} vaultPath={vaultPath} isDarkTheme={isDarkTheme} isTrashed={isTrashed} />
     </div>
   )