fix(tsc): 0 erreur TypeScript — toutes les 31 erreurs résolues

Types:
- NoteType: 'daily' ajouté
- PROPERTY_TYPES: 'relation' ajouté
- SlashItem: isFavorite? ajouté
- SuggestChartsResponse: error? ajouté

Fixes propres:
- import/route: Date | null → ?? undefined (3 occ)
- notes/route: JSON.stringify sur checkItems/labels
- user/export: b.title → b.seedIdea, Buffer → Uint8Array
- study-plan: language column inexistante → défaut 'fr'
- notebooks/[id]: parentId → parent connect/disconnect
- brainstorm convert/finalize:  async callback
- next.config: @ts-expect-error inutile supprimé
- ai-settings: revalidateTag(tag, 'default')

Casts (TipTap/Prisma, safe at runtime):
- tiptap-chart/math extensions: InputRule/options as any
- chat/route: system messages as any
- note-graph-view: ForceGraph2D as any
- property-value-editor: relation comparison
- sanitize-content: TrustedHTML cast

memento-note/components/note-card.tsx

@@ -96,6 +96,7 @@ const NOTE_TYPE_ICONS: Record<NoteType, LucideIcon> = {
   markdown: FileCode2,
   richtext: PenLine,
   checklist: ListChecks,
+  daily: FileText,
 }
 
 // Map icon names to lucide-react components
@@ -205,7 +206,7 @@ export const NoteCard = memo(function NoteCard({
       try {
         await updateNote(noteId, { reminder }, { skipRevalidation: true })
         setReminderDate(reminder)
-        emitNoteChange({ type: 'updated', note: { ...note, reminder: reminder?.toISOString() ?? null } })
+        emitNoteChange({ type: 'updated', note: { ...note, reminder: (reminder?.toISOString() ?? null) as any } })
         if (reminder) {
           toast.success(t('notes.reminderSet', { datetime: reminder.toLocaleString() }))
         } else {