feat: IA Note — rename panel, add Resource tab + chat hover-actions

- Renamed 'AI Copilot' / 'Assistant IA' → 'IA Note' everywhere in UI
- Added 3rd 'Ressource' tab in IA Note panel with:
  * Optional URL field that scrapes page text (via new scrapePageText action)
  * Textarea for paste (markdown, HTML, plain text)
  * 3 integration modes: Remplacer / Compléter (AI) / Fusionner (AI)
  * Dual-format preview: Rendu + Markdown brut before applying
- Added hover-actions on assistant chat messages:
  * Remplacer / Compléter / Fusionner appear on hover
  * Triggers same preview/apply flow via resource tab
- New API route: POST /api/ai/enrich-from-resource
  * Supports complete and merge modes with language-aware prompts
- Extended scrape.ts with scrapePageText() (full content extraction)

memento-note/app/api/ai/enrich-from-resource/route.ts

@@ -0,0 +1,86 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { auth } from '@/auth'
+import { getSystemConfig } from '@/lib/config'
+import { getTagsProvider } from '@/lib/ai/factory'
+
+export async function POST(request: NextRequest) {
+  try {
+    const session = await auth()
+    if (!session?.user?.id) {
+      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+    }
+
+    const { existingContent, resourceText, mode, language } = await request.json()
+
+    if (!resourceText || typeof resourceText !== 'string') {
+      return NextResponse.json({ error: 'resourceText is required' }, { status: 400 })
+    }
+    if (!mode || !['complete', 'merge'].includes(mode)) {
+      return NextResponse.json({ error: 'mode must be "complete" or "merge"' }, { status: 400 })
+    }
+
+    const lang = language || 'fr'
+    const config = await getSystemConfig()
+    const provider = getTagsProvider(config)
+
+    let prompt: string
+
+    if (mode === 'complete') {
+      // Add missing info from resource without rewriting the existing note
+      prompt = `You are an expert note editor. Your task is to enrich an existing note by adding relevant information from a provided resource, WITHOUT modifying or rewriting the existing content.
+
+LANGUAGE RULE: Respond in ${lang}. Match the language of the existing note.
+
+EXISTING NOTE:
+---
+${existingContent || '(empty note)'}
+---
+
+RESOURCE TO INTEGRATE:
+---
+${resourceText}
+---
+
+INSTRUCTIONS:
+- Keep ALL existing note content exactly as-is at the top
+- Append ONLY new, non-redundant information from the resource below the existing content
+- Use a clear separator (e.g., "---" or a new section heading) between existing and new content
+- Skip information already covered in the existing note
+- Format the new content consistently with the existing note style
+- Respond ONLY with the enriched note content, no explanations`
+    } else {
+      // Merge: intelligently rewrite integrating both sources
+      prompt = `You are an expert note writer. Your task is to intelligently merge an existing note with a resource into a single, coherent, well-structured document.
+
+LANGUAGE RULE: Respond in ${lang}. Match the language of the existing note.
+
+EXISTING NOTE:
+---
+${existingContent || '(empty note)'}
+---
+
+RESOURCE TO INTEGRATE:
+---
+${resourceText}
+---
+
+INSTRUCTIONS:
+- Combine both sources into one cohesive, well-organized document
+- Eliminate redundancy — include each piece of information only once
+- Preserve the key ideas from both sources
+- Maintain a logical structure with clear headings if appropriate
+- Keep the tone and style consistent
+- Respond ONLY with the merged content, no meta-commentary or explanations`
+    }
+
+    const enrichedContent = await provider.generateText(prompt)
+
+    return NextResponse.json({ enrichedContent: enrichedContent.trim() })
+  } catch (error: any) {
+    console.error('[enrich-from-resource] Error:', error)
+    return NextResponse.json(
+      { error: error.message || 'Failed to enrich content' },
+      { status: 500 }
+    )
+  }
+}