fix(ui): resolve breadcrumb visibility and AI combobox layout issues

memento-note/components/note-editor/note-editor-full-page.tsx

@@ -11,6 +11,7 @@ import { ReminderDialog } from '@/components/reminder-dialog'
 import { ContextualAIChat } from '@/components/contextual-ai-chat'
 import { NoteDocumentInfoPanel } from '@/components/note-document-info-panel'
 import { format } from 'date-fns'
+import { ChevronRight } from 'lucide-react'
 import { toast } from 'sonner'
 import { Note } from '@/lib/types'
 
@@ -40,10 +41,10 @@ export function NoteEditorFullPage({ onClose }: NoteEditorFullPageProps) {
             {/* Breadcrumb + Title block */}
             <div className="space-y-4">
               {/* Breadcrumb: Notebook › Date */}
-              <div className="flex items-center gap-3 text-[12px] text-foreground/50 uppercase tracking-[.25em] font-bold">
-                {notebookName && <span>{notebookName}</span>}
-                {notebookName && <span>›</span>}
-                <span suppressHydrationWarning>
+              <div className="flex items-center gap-3 text-[12px] uppercase tracking-[.25em] font-bold">
+                {notebookName && <span style={{ color: 'var(--color-ink)' }}>{notebookName}</span>}
+                {notebookName && <ChevronRight size={10} style={{ color: 'var(--color-concrete)' }} />}
+                <span suppressHydrationWarning style={{ color: 'var(--color-concrete)' }}>
                   {format(new Date(note.contentUpdatedAt), 'MMM d, yyyy')}
                 </span>
               </div>