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/tiptap-chart-extension.tsx

@@ -93,7 +93,7 @@ export const ChartExtension = Node.create({
   addNodeView() {
     return ReactNodeViewRenderer(ChartBlockView, {
       contentEditable: false,
-    })
+    } as any)
   }
 })
 
@@ -128,7 +128,7 @@ function ChartBlockView(props: any) {
             Done
           </button>
         </div>
-        <NodeViewContent as="pre" className="p-4 bg-muted/30 rounded-b-lg overflow-x-auto" />
+        <NodeViewContent as={"pre" as any} className="p-4 bg-muted/30 rounded-b-lg overflow-x-auto" />
       </NodeViewWrapper>
     )
   }