fix: resolve all 6 prefer-const eslint errors for CI

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) {

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')