fix: hide Raw toggle for non-markdown files forced into raw editor

Non-markdown text files (.yml, .yaml, .json, etc.) are already forced
into raw editor mode via effectiveRawMode. This hides the Raw toggle
button in the breadcrumb bar for those files since toggling is not
applicable. Adds tests for classify_file_kind and forceRawMode behavior.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/BreadcrumbBar.test.tsx

@@ -174,4 +174,17 @@ describe('BreadcrumbBar — raw editor toggle', () => {
     fireEvent.click(screen.getByTitle('Raw editor'))
     expect(onToggleRaw).toHaveBeenCalledOnce()
   })
+
+  it('hides raw toggle when forceRawMode is true (non-markdown file)', () => {
+    const onToggleRaw = vi.fn()
+    render(<BreadcrumbBar entry={baseEntry} {...defaultProps} rawMode={true} onToggleRaw={onToggleRaw} forceRawMode={true} />)
+    expect(screen.queryByTitle('Raw editor')).not.toBeInTheDocument()
+    expect(screen.queryByTitle('Back to editor')).not.toBeInTheDocument()
+  })
+
+  it('shows raw toggle when forceRawMode is false (markdown file)', () => {
+    const onToggleRaw = vi.fn()
+    render(<BreadcrumbBar entry={baseEntry} {...defaultProps} rawMode={false} onToggleRaw={onToggleRaw} forceRawMode={false} />)
+    expect(screen.getByTitle('Raw editor')).toBeInTheDocument()
+  })
 })

src/components/BreadcrumbBar.tsx

@@ -26,6 +26,8 @@ interface BreadcrumbBarProps {
   onToggleDiff: () => void
   rawMode?: boolean
   onToggleRaw?: () => void
+  /** When true, raw mode is forced (non-markdown file) — hide the toggle. */
+  forceRawMode?: boolean
   showAIChat?: boolean
   onToggleAIChat?: () => void
   inspectorCollapsed?: boolean
@@ -58,7 +60,7 @@ function RawToggleButton({ rawMode, onToggleRaw }: { rawMode?: boolean; onToggle
 }
 
 function BreadcrumbActions({ entry, showDiffToggle, diffMode, diffLoading, onToggleDiff,
-  rawMode, onToggleRaw,
+  rawMode, onToggleRaw, forceRawMode,
   showAIChat, onToggleAIChat, inspectorCollapsed, onToggleInspector,
   onToggleFavorite, onToggleOrganized, onTrash, onRestore, onArchive, onUnarchive,
 }: Omit<BreadcrumbBarProps, 'wordCount'>) {
@@ -112,7 +114,7 @@ function BreadcrumbActions({ entry, showDiffToggle, diffMode, diffLoading, onTog
           <GitBranch size={16} />
         </button>
       )}
-      <RawToggleButton rawMode={rawMode} onToggleRaw={onToggleRaw} />
+      {!forceRawMode && <RawToggleButton rawMode={rawMode} onToggleRaw={onToggleRaw} />}
       <button
         className="flex items-center justify-center border-none bg-transparent p-0 text-muted-foreground"
         style={DISABLED_ICON_STYLE}

src/components/EditorContent.tsx

@@ -222,7 +222,7 @@ export function EditorContent({
       <ActiveTabBreadcrumb
         activeTab={activeTab}
         barRef={breadcrumbBarRef}
-        props={{ diffMode, diffContent, onToggleDiff, rawMode: effectiveRawMode, onToggleRaw, ...breadcrumbProps }}
+        props={{ diffMode, diffContent, onToggleDiff, rawMode: effectiveRawMode, onToggleRaw, forceRawMode: isNonMarkdownText, ...breadcrumbProps }}
       />
       {isTrashed && (
         <TrashedNoteBanner