UI Stabilization: Global color theme updates (#75B2D6), AI Assistant styling refactor, and navigation fixes

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

@@ -34,8 +34,8 @@ export function NoteEditorFullPage({ onClose }: NoteEditorFullPageProps) {
           {/* TOOLBAR */}
           <NoteEditorToolbar mode="fullPage" onClose={onClose} />
 
-          {/* BODY — max-w-4xl, px-12, py-16 */}
-          <div className="max-w-4xl mx-auto w-full px-12 py-16 space-y-12">
+          {/* BODY — max-w-4xl, responsive px, py-16 */}
+          <div className="max-w-4xl mx-auto w-full px-6 sm:px-12 py-16 space-y-12 min-w-0">
 
             {/* Breadcrumb + Title block */}
             <div className="space-y-4">