feat: editor improvements and architectural grid prototype

Multiple feature additions and improvements across the application:

- NextGen Editor: drag handles, smart paste, block actions
- Structured views: Kanban and table layouts for notes
- Architectural Grid: new brainstorming/agent interface prototype
- Flashcards: SM-2 revision algorithm with AI generation
- MCP server: robustness improvements
- Graph/PDF chat: fix click propagation and copy behavior
- Various UI/UX enhancements and bug fixes

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

memento-note/components/notes-editorial-view.tsx

@@ -27,6 +27,7 @@ import { fr } from 'date-fns/locale/fr'
 import { enUS } from 'date-fns/locale/en-US'
 import { formatAbsoluteDateLocalized } from '@/lib/utils/format-localized-date'
 import { cn } from '@/lib/utils'
+import { useHydrated } from '@/lib/use-hydrated'
 
 type NotesEditorialViewProps = {
   notes: Note[]
@@ -364,6 +365,7 @@ export function NotesEditorialView({
   const { t, language } = useLanguage()
   const { data: session } = useSession()
   const { data: allLabels } = useLabelsQuery()
+  const hydrated = useHydrated()
   const [aiIllustrationEnabled, setAiIllustrationEnabled] = useState(false)
 
   useEffect(() => {
@@ -388,9 +390,9 @@ export function NotesEditorialView({
           return (
             <motion.article
               key={note.id}
-              initial={{ opacity: 0, y: 20 }}
+              initial={hydrated ? { opacity: 0, y: 20 } : false}
               animate={{ opacity: 1, y: 0 }}
-              transition={{ delay: 0.05 * index, duration: 0.6 }}
+              transition={hydrated ? { delay: 0.05 * index, duration: 0.6 } : { duration: 0 }}
               className="space-y-4 group cursor-pointer relative pb-8"
               onClick={() => onOpen(note)}
             >