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-math-extension.tsx

@@ -72,7 +72,7 @@ const MathEquationView = ({ node, updateAttributes, deleteNode, selected }: any)
 
   const insertSymbol = (symbol: string) => {
     const el = inputRef.current
-    if (!el) { setInput(prev => prev + symbol); return }
+    if (!el) { setInput((prev: string) => prev + symbol); return }
     const start = el.selectionStart
     const end = el.selectionEnd
     const newVal = input.slice(0, start) + symbol + input.slice(end)
@@ -286,14 +286,14 @@ export const MathEquationExtension = Node.create({
     return [
       {
         find: /\$\$([^$]+)\$\$$/,
-        handler: ({ state, range, match }) => {
+        handler: ({ state, range, match }: any) => {
           const latex = match[1]
           const tr = state.tr
           tr.deleteRange(range.from, range.to)
           tr.insert(range.from, state.schema.nodes.mathEquationBlock.create({ latex }))
         },
       },
-    ]
+    ] as any
   },
 })
 
@@ -338,7 +338,7 @@ export const InlineMathExtension = Node.create({
     return [
       {
         find: /(?:^|\s)\$([^$\n]+)\$$/,
-        handler: ({ state, range, match }) => {
+        handler: ({ state, range, match }: any) => {
           const fullMatch = match[0]
           const latex = match[1]
           const leadingSpace = fullMatch.startsWith(' ') ? ' ' : ''
@@ -352,7 +352,7 @@ export const InlineMathExtension = Node.create({
           ])
         },
       },
-    ]
+    ] as any
   },
 })