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/components/label-selector.tsx

@@ -9,6 +9,7 @@ import { Tag, Plus, Check } from 'lucide-react'
 import { cn } from '@/lib/utils'
 import { useLabels } from '@/context/LabelContext'
 import { LabelBadge } from './label-badge'
+import { useLanguage } from '@/lib/i18n'
 
 interface LabelSelectorProps {
   selectedLabels: string[]
@@ -22,10 +23,11 @@ export function LabelSelector({
   selectedLabels,
   onLabelsChange,
   variant = 'default',
-  triggerLabel = 'Labels',
+  triggerLabel,
   align = 'start',
 }: LabelSelectorProps) {
   const { labels, loading, addLabel } = useLabels()
+  const { t } = useLanguage()
   const [search, setSearch] = useState('')
 
   const filteredLabels = labels.filter(l => 
@@ -56,7 +58,7 @@ export function LabelSelector({
       <DropdownMenuTrigger asChild>
         <Button variant="ghost" size="sm" className="h-8 text-gray-500 hover:text-gray-900 dark:text-gray-400 dark:hover:text-gray-100 px-2">
           <Tag className={cn("h-4 w-4", triggerLabel && "mr-2")} />
-          {triggerLabel}
+          {triggerLabel || t('labels.title')}
           {selectedLabels.length > 0 && (
             <Badge variant="secondary" className="ml-2 h-5 min-w-5 px-1.5 bg-gray-200 text-gray-800 dark:bg-zinc-700 dark:text-zinc-300">
               {selectedLabels.length}
@@ -66,8 +68,8 @@ export function LabelSelector({
       </DropdownMenuTrigger>
       <DropdownMenuContent align={align} className="w-64 p-0">
         <div className="p-2">
-          <Input 
-            placeholder="Enter label name" 
+          <Input
+            placeholder={t('labels.namePlaceholder')}
             value={search}
             onChange={(e) => setSearch(e.target.value)}
             className="h-8 text-sm"
@@ -82,7 +84,7 @@ export function LabelSelector({
         
         <div className="max-h-64 overflow-y-auto px-1 pb-1">
           {loading ? (
-            <div className="p-2 text-sm text-gray-500 text-center">Loading...</div>
+            <div className="p-2 text-sm text-gray-500 text-center">{t('general.loading')}</div>
           ) : (
             <>
               {filteredLabels.map((label) => {
@@ -108,7 +110,7 @@ export function LabelSelector({
               })}
 
               {showCreateOption && (
-                <div 
+                <div
                   onClick={(e) => {
                     e.preventDefault()
                     handleCreateLabel()
@@ -116,12 +118,12 @@ export function LabelSelector({
                   className="flex items-center gap-2 p-2 rounded-sm cursor-pointer text-sm border-t mt-1 font-medium hover:bg-accent hover:text-accent-foreground"
                 >
                   <Plus className="h-4 w-4" />
-                  <span>Create "{search}"</span>
+                  <span>{t('labels.createLabel', { name: search })}</span>
                 </div>
               )}
-              
+
               {filteredLabels.length === 0 && !showCreateOption && (
-                <div className="p-2 text-sm text-gray-500 text-center">No labels found</div>
+                <div className="p-2 text-sm text-gray-500 text-center">{t('labels.noLabelsFound')}</div>
               )}
             </>
           )}