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/move-to-notebook-picker.tsx

@@ -60,7 +60,7 @@ export function MoveToNotebookPicker({
     close()
   }
 
-  const child = React.cloneElement(children, {
+  const child = React.cloneElement(children as any, {
     ref: (node: HTMLElement | null) => {
       triggerRef.current = node
       const childRef = (children as React.ReactElement & { ref?: React.Ref<HTMLElement> }).ref
@@ -71,7 +71,7 @@ export function MoveToNotebookPicker({
     },
     onClick: (e: React.MouseEvent) => {
       e.stopPropagation()
-      children.props.onClick?.(e)
+      ;(children as any).props.onClick?.(e)
       setOpen((prev) => !prev)
     },
   })