diff --git a/memento-note/app/actions/notes.ts b/memento-note/app/actions/notes.ts
index 4f22b9c..a0704ce 100644
--- a/memento-note/app/actions/notes.ts
+++ b/memento-note/app/actions/notes.ts
@@ -1236,7 +1236,7 @@ export async function cleanupAllOrphans() {
   const userId = session.user.id;
   let createdCount = 0;
   let deletedCount = 0;
-  let errors: any[] = [];
+  const errors: any[] = [];
   try {
     const allNotes = await prisma.note.findMany({
       where: { userId },
diff --git a/memento-note/app/api/brainstorm/[sessionId]/expand/route.ts b/memento-note/app/api/brainstorm/[sessionId]/expand/route.ts
index 06adc82..37e029d 100644
--- a/memento-note/app/api/brainstorm/[sessionId]/expand/route.ts
+++ b/memento-note/app/api/brainstorm/[sessionId]/expand/route.ts
@@ -41,7 +41,7 @@ async function getParentContext(
     include: { note: { select: { id: true, title: true, content: true } } },
   })
 
-  let noteIds = refs.map(r => r.noteId).filter(Boolean) as string[]
+  const noteIds = refs.map(r => r.noteId).filter(Boolean) as string[]
 
   const notes: ParentNoteRef[] = refs.map(r => ({
     noteId: r.noteId,
diff --git a/memento-note/app/api/chat/route.ts b/memento-note/app/api/chat/route.ts
index fc5742b..8c6193d 100644
--- a/memento-note/app/api/chat/route.ts
+++ b/memento-note/app/api/chat/route.ts
@@ -306,7 +306,7 @@ Tu as accès à : note_search, note_read, document_search, task_extract, web_sea
   const contextBlock = contextNotes.length > 0 ? prompts.contextWithNotes : prompts.contextNoNotes
 
   // Load note images for vision
-  let imageContextParts: Array<{ type: 'image'; image: string }> = []
+  const imageContextParts: Array<{ type: 'image'; image: string }> = []
   if (noteContext?.images && noteContext.images.length > 0) {
     for (const imgPath of noteContext.images.slice(0, 4)) {
       try {
diff --git a/memento-note/app/api/notes/route.ts b/memento-note/app/api/notes/route.ts
index c58e5c3..0857a1d 100644
--- a/memento-note/app/api/notes/route.ts
+++ b/memento-note/app/api/notes/route.ts
@@ -20,7 +20,7 @@ export async function GET(request: NextRequest) {
     const notebookId = searchParams.get('notebookId')
     const limit = searchParams.get('limit') ? parseInt(searchParams.get('limit')!) : undefined
 
-    let where: any = {
+    const where: any = {
       userId: session.user.id,
       trashedAt: null
     }
diff --git a/memento-note/lib/ai/tools/task-extract.tool.ts b/memento-note/lib/ai/tools/task-extract.tool.ts
index 0d1ae2d..94d89f2 100644
--- a/memento-note/lib/ai/tools/task-extract.tool.ts
+++ b/memento-note/lib/ai/tools/task-extract.tool.ts
@@ -19,7 +19,7 @@ toolRegistry.register({
       }),
       execute: async ({ notebookId, noteIds, locale }) => {
         try {
-          let where: any = { userId: ctx.userId, trashedAt: null }
+          const where: any = { userId: ctx.userId, trashedAt: null }
           if (noteIds && noteIds.length > 0) {
             where.id = { in: noteIds }
           } else if (notebookId) {
diff --git a/memento-note/lib/note-preview.ts b/memento-note/lib/note-preview.ts
index 4d460bf..446bc5b 100644
--- a/memento-note/lib/note-preview.ts
+++ b/memento-note/lib/note-preview.ts
@@ -8,7 +8,7 @@ const HTML_IMG = /<img[^>]+src=["']([^"']+)["'][^>]*>/gi
  */
 export function stripMarkdownPreview(raw: string, maxLen = 180): string {
   if (!raw?.trim()) return ''
-  let t = raw
+  const t = raw
     .replace(/^#{1,6}\s+/gm, '')
     .replace(/```[\s\S]*?```/g, ' ')
     .replace(/\*\*([^*]+)\*\*/g, '$1')