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/app/api/notes/[id]/network/route.ts

@@ -66,13 +66,13 @@ export async function GET(
     console.error('[network] NoteLink query failed:', err)
   }
 
-  const mapBacklink = (bl: (typeof backlinks)[number]) => ({
+  const mapBacklink = (bl: any) => ({
     id: bl.id,
     note: bl.sourceNote,
     contextSnippet: bl.contextSnippet,
     createdAt: bl.createdAt,
   })
-  const mapOutbound = (ol: (typeof outbound)[number]) => ({
+  const mapOutbound = (ol: any) => ({
     id: ol.id,
     note: ol.targetNote,
     contextSnippet: ol.contextSnippet,

memento-note/app/api/notes/import/route.ts

@@ -160,7 +160,7 @@ export async function POST(req: NextRequest) {
               links: n.links ?? undefined,
               trashedAt: parseDate(n.trashedAt),
               notebookId: n.notebookId ?? null,
-              contentUpdatedAt: parseDate(n.contentUpdatedAt),
+              contentUpdatedAt: parseDate(n.contentUpdatedAt) ?? undefined,
               updatedAt: new Date(),
               labelRelations: {
                 set: validLabelIds.map(id => ({ id })),
@@ -187,7 +187,7 @@ export async function POST(req: NextRequest) {
               userId,
               createdAt: parseDate(n.createdAt) ?? new Date(),
               updatedAt: parseDate(n.updatedAt) ?? new Date(),
-              contentUpdatedAt: parseDate(n.contentUpdatedAt),
+              contentUpdatedAt: parseDate(n.contentUpdatedAt) ?? undefined,
               labelRelations: {
                 connect: validLabelIds.map(id => ({ id })),
               },
@@ -211,7 +211,7 @@ export async function POST(req: NextRequest) {
                 userId,
                 createdAt: parseDate(n.createdAt) ?? new Date(),
                 updatedAt: parseDate(n.updatedAt) ?? new Date(),
-                contentUpdatedAt: parseDate(n.contentUpdatedAt),
+                contentUpdatedAt: parseDate(n.contentUpdatedAt) ?? undefined,
               },
             })
             stats.notes++

memento-note/app/api/notes/report/route.ts

@@ -17,7 +17,7 @@ export async function POST(request: NextRequest) {
     // Store as a notification to the note owner + admin
     await prisma.notification.create({
       data: {
-        userId: note.userId,
+        userId: note.userId!,
         type: 'content_report',
         title: `Signalement : ${reason}`,
         message: details || `Un visiteur a signalé votre note publiée pour: ${reason}`,

memento-note/app/api/notes/route.ts

@@ -149,8 +149,8 @@ export async function PUT(request: NextRequest) {
     if (content !== undefined) updateData.content = content
     if (color !== undefined) updateData.color = color
     if (type !== undefined) updateData.type = type
-    if (checkItems !== undefined) updateData.checkItems = checkItems ?? null
-    if (labels !== undefined) updateData.labels = labels ?? null
+    if (checkItems !== undefined) updateData.checkItems = checkItems != null ? JSON.stringify(checkItems) : null
+    if (labels !== undefined) updateData.labels = labels != null ? JSON.stringify(labels) : null
     if (isPinned !== undefined) updateData.isPinned = isPinned
     if (isArchived !== undefined) updateData.isArchived = isArchived
     if (images !== undefined) updateData.images = images ?? null