feat: Complete internationalization and code cleanup

## Translation Files
- Add 11 new language files (es, de, pt, ru, zh, ja, ko, ar, hi, nl, pl)
- Add 100+ missing translation keys across all 15 languages
- New sections: notebook, pagination, ai.batchOrganization, ai.autoLabels
- Update nav section with workspace, quickAccess, myLibrary keys

## Component Updates
- Update 15+ components to use translation keys instead of hardcoded text
- Components: notebook dialogs, sidebar, header, note-input, ghost-tags, etc.
- Replace 80+ hardcoded English/French strings with t() calls
- Ensure consistent UI across all supported languages

## Code Quality
- Remove 77+ console.log statements from codebase
- Clean up API routes, components, hooks, and services
- Keep only essential error handling (no debugging logs)

## UI/UX Improvements
- Update Keep logo to yellow post-it style (from-yellow-400 to-amber-500)
- Change selection colors to #FEF3C6 (notebooks) and #EFB162 (nav items)
- Make "+" button permanently visible in notebooks section
- Fix grammar and syntax errors in multiple components

## Bug Fixes
- Fix JSON syntax errors in it.json, nl.json, pl.json, zh.json
- Fix syntax errors in notebook-suggestion-toast.tsx
- Fix syntax errors in use-auto-tagging.ts
- Fix syntax errors in paragraph-refactor.service.ts
- Fix duplicate "fusion" section in nl.json

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Ou une version plus courte si vous préférez :

feat(i18n): Add 15 languages, remove logs, update UI components

- Create 11 new translation files (es, de, pt, ru, zh, ja, ko, ar, hi, nl, pl)
- Add 100+ translation keys: notebook, pagination, AI features
- Update 15+ components to use translations (80+ strings)
- Remove 77+ console.log statements from codebase
- Fix JSON syntax errors in 4 translation files
- Fix component syntax errors (toast, hooks, services)
- Update logo to yellow post-it style
- Change selection colors (#FEF3C6, #EFB162)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

keep-notes/context/LabelContext.tsx

@@ -16,7 +16,9 @@ export interface Label {
 interface LabelContextType {
   labels: Label[]
   loading: boolean
-  addLabel: (name: string, color?: LabelColorName) => Promise<void>
+  notebookId?: string | null
+  setNotebookId: (notebookId: string | null) => void
+  addLabel: (name: string, color?: LabelColorName, notebookId?: string | null) => Promise<void>
   updateLabel: (id: string, updates: Partial<Pick<Label, 'name' | 'color'>>) => Promise<void>
   deleteLabel: (id: string) => Promise<void>
   getLabelColor: (name: string) => LabelColorName
@@ -28,11 +30,18 @@ const LabelContext = createContext<LabelContextType | undefined>(undefined)
 export function LabelProvider({ children }: { children: ReactNode }) {
   const [labels, setLabels] = useState<Label[]>([])
   const [loading, setLoading] = useState(true)
+  const [notebookId, setNotebookId] = useState<string | null>(null)
 
   const fetchLabels = async () => {
     try {
       setLoading(true)
-      const response = await fetch('/api/labels', {
+      // Build URL with notebookId filter
+      const url = new URL('/api/labels', window.location.origin)
+      if (notebookId) {
+        url.searchParams.set('notebookId', notebookId)
+      }
+
+      const response = await fetch(url.toString(), {
         cache: 'no-store',
         credentials: 'include'
       })
@@ -47,18 +56,20 @@ export function LabelProvider({ children }: { children: ReactNode }) {
     }
   }
 
+  // Re-fetch labels when notebookId changes
   useEffect(() => {
     fetchLabels()
-  }, [])
+  }, [notebookId])
 
-  const addLabel = async (name: string, color?: LabelColorName) => {
+  const addLabel = async (name: string, color?: LabelColorName, labelNotebookId?: string | null) => {
     try {
       const labelColor = color || getHashColor(name);
+      const finalNotebookId = labelNotebookId || notebookId
 
       const response = await fetch('/api/labels', {
         method: 'POST',
         headers: { 'Content-Type': 'application/json' },
-        body: JSON.stringify({ name, color: labelColor }),
+        body: JSON.stringify({ name, color: labelColor, notebookId: finalNotebookId }),
       })
       const data = await response.json()
       if (data.success && data.data) {
@@ -115,6 +126,8 @@ export function LabelProvider({ children }: { children: ReactNode }) {
   const value: LabelContextType = {
     labels,
     loading,
+    notebookId,
+    setNotebookId,
     addLabel,
     updateLabel,
     deleteLabel,