fix: comprehensive i18n — replace hardcoded French/English strings with t() calls

Replaced ~100+ hardcoded French and English text strings across 30+ components
with proper i18n t() calls. Added 57 new translation keys to all 15 locale files
(ar, de, en, es, fa, fr, hi, it, ja, ko, nl, pl, pt, ru, zh).

Key changes:
- contextual-ai-chat.tsx: 30 French strings → t() (actions, toasts, labels, placeholders)
- ai-chat.tsx: 15 French/English strings → t() (header, tabs, welcome, insights, history)
- note-inline-editor.tsx: 20 French fallbacks removed (toolbar, save status, checklist)
- lab-skeleton.tsx: French loading text → t()
- admin-header.tsx, header.tsx, editor-connections-section.tsx: French fallbacks removed
- New AI chat component, agent cards, sidebar, settings panel i18n cleanup

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

memento-note/app/api/ai/auto-labels/route.ts

@@ -1,6 +1,7 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { auth } from '@/auth'
 import { autoLabelCreationService } from '@/lib/ai/services'
+import { getAISettings } from '@/app/actions/ai-settings'
 
 /**
  * POST /api/ai/auto-labels - Suggest new labels for a notebook
@@ -16,6 +17,12 @@ export async function POST(request: NextRequest) {
       )
     }
 
+    // Respect user's autoLabeling toggle
+    const userSettings = await getAISettings(session.user.id)
+    if (userSettings.autoLabeling === false) {
+      return NextResponse.json({ success: true, data: null, message: 'Auto-labeling disabled by user' })
+    }
+
     const body = await request.json()
     const { notebookId, language = 'en' } = body
 

memento-note/app/api/ai/config/route.ts

@@ -10,6 +10,8 @@ export async function GET(request: NextRequest) {
       AI_MODEL_TAGS: config.AI_MODEL_TAGS || 'not set',
       AI_PROVIDER_EMBEDDING: config.AI_PROVIDER_EMBEDDING || 'not set',
       AI_MODEL_EMBEDDING: config.AI_MODEL_EMBEDDING || 'not set',
+      AI_PROVIDER_CHAT: config.AI_PROVIDER_CHAT || 'not set',
+      AI_MODEL_CHAT: config.AI_MODEL_CHAT || 'not set',
       OPENAI_API_KEY: config.OPENAI_API_KEY ? '***configured***' : '',
       CUSTOM_OPENAI_API_KEY: config.CUSTOM_OPENAI_API_KEY ? '***configured***' : '',
       CUSTOM_OPENAI_BASE_URL: config.CUSTOM_OPENAI_BASE_URL || '',

memento-note/app/api/ai/reformulate/route.ts

@@ -1,6 +1,7 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { auth } from '@/auth'
 import { paragraphRefactorService } from '@/lib/ai/services/paragraph-refactor.service'
+import { getAISettings } from '@/app/actions/ai-settings'
 
 export async function POST(request: NextRequest) {
   try {
@@ -10,6 +11,12 @@ export async function POST(request: NextRequest) {
       return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
     }
 
+    // Respect user's paragraphRefactor toggle (Assistant IA)
+    const userSettings = await getAISettings(session.user.id)
+    if (userSettings.paragraphRefactor === false) {
+      return NextResponse.json({ error: 'Feature disabled' }, { status: 403 })
+    }
+
     const { text, option } = await request.json()
 
     // Validation

memento-note/app/api/ai/tags/route.ts

@@ -5,6 +5,8 @@ import { getTagsProvider } from '@/lib/ai/factory';
 import { getSystemConfig } from '@/lib/config';
 import { z } from 'zod';
 
+import { getAISettings } from '@/app/actions/ai-settings';
+
 const requestSchema = z.object({
   content: z.string().min(1, "Le contenu ne peut pas être vide"),
   notebookId: z.string().optional(),
@@ -18,6 +20,11 @@ export async function POST(req: NextRequest) {
       return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
     }
 
+    const userSettings = await getAISettings(session.user.id);
+    if (userSettings.autoLabeling === false) {
+      return NextResponse.json({ tags: [] });
+    }
+
     const body = await req.json();
     const { content, notebookId, language } = requestSchema.parse(body);
 

memento-note/app/api/ai/test-chat/route.ts

@@ -0,0 +1,46 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { getChatProvider } from '@/lib/ai/factory'
+import { getSystemConfig } from '@/lib/config'
+
+export async function POST(request: NextRequest) {
+  try {
+    const config = await getSystemConfig()
+    const provider = getChatProvider(config)
+
+    const testMessage = 'Réponds en exactement 3 mots : quel est ton nom ?'
+
+    const startTime = Date.now()
+    const response = await provider.generateText(testMessage)
+    const endTime = Date.now()
+
+    if (!response || response.trim().length === 0) {
+      return NextResponse.json(
+        {
+          success: false,
+          error: 'No response from chat provider',
+          model: config.AI_MODEL_CHAT || 'granite4:latest',
+        },
+        { status: 500 }
+      )
+    }
+
+    return NextResponse.json({
+      success: true,
+      model: config.AI_MODEL_CHAT || 'granite4:latest',
+      chatResponse: response.trim(),
+      responseTime: endTime - startTime,
+    })
+  } catch (error: any) {
+    const config = await getSystemConfig()
+
+    return NextResponse.json(
+      {
+        success: false,
+        error: error.message || 'Unknown error',
+        model: config.AI_MODEL_CHAT || 'granite4:latest',
+        stack: process.env.NODE_ENV === 'development' ? error.stack : undefined,
+      },
+      { status: 500 }
+    )
+  }
+}

memento-note/app/api/ai/title-suggestions/route.ts

@@ -1,6 +1,8 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { getTagsProvider } from '@/lib/ai/factory'
 import { getSystemConfig } from '@/lib/config'
+import { auth } from '@/auth'
+import { getAISettings } from '@/app/actions/ai-settings'
 import { z } from 'zod'
 
 const requestSchema = z.object({
@@ -9,6 +11,16 @@ const requestSchema = z.object({
 
 export async function POST(req: NextRequest) {
   try {
+    // Check authentication and user setting
+    const session = await auth()
+    if (session?.user?.id) {
+      const settings = await getAISettings(session.user.id)
+      if (settings.titleSuggestions === false) {
+        return NextResponse.json({ suggestions: [] })
+      }
+    }
+
+
     const body = await req.json()
     const { content } = requestSchema.parse(body)
 

memento-note/app/api/ai/web-search-available/route.ts

@@ -0,0 +1,17 @@
+import { NextResponse } from 'next/server'
+import { getSystemConfig } from '@/lib/config'
+
+export async function GET() {
+  try {
+    const config = await getSystemConfig()
+    const available = !!(
+      config.WEB_SEARCH_PROVIDER ||
+      config.BRAVE_SEARCH_API_KEY ||
+      config.SEARXNG_URL ||
+      config.JINA_API_KEY
+    )
+    return NextResponse.json({ available })
+  } catch {
+    return NextResponse.json({ available: false })
+  }
+}