fix: i18n system overhaul and sidebar UI bugs

- Fix LanguageProvider: add RTL support (ar/fa), translation caching,
  prevent blank flash during load, browser language detection
- Fix detect-user-language: extend whitelist from 5 to all 15 languages
- Remove hardcoded initialLanguage="fr" from auth layout
- Complete fr.json translation (all sections translated from English)
- Add missing admin.ai keys to all 13 non-English locales
- Translate ai.autoLabels, ai.batchOrganization, memoryEcho sections
  for all locales
- Remove duplicate top-level autoLabels/batchOrganization from en.json
- Fix notebook creation: replace window.location.reload() with
  createNotebookOptimistic + router.refresh()
- Fix notebook name truncation in sidebar with min-w-0
- Remove redundant router.refresh() after note creation in page.tsx

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

keep-notes/locales/pl.json

@@ -63,7 +63,13 @@
       "tagsGenerationProvider": "Tags Generation Provider",
       "title": "AI Configuration",
       "updateFailed": "Failed to update AI settings",
-      "updateSuccess": "AI Settings updated successfully"
+      "updateSuccess": "AI Settings updated successfully",
+      "bestValue": "Najlepszy stosunek jakości do ceny",
+      "bestQuality": "Najwyższa jakość",
+      "providerOllamaOption": "🦙 Ollama (Local & Free)",
+      "providerOpenAIOption": "🤖 OpenAI (GPT-5, GPT-4)",
+      "providerCustomOption": "🔧 Custom OpenAI-Compatible",
+      "saved": "(Zapisano)"
     },
     "aiTest": {
       "description": "Test your AI providers for tag generation and semantic search embeddings",
@@ -156,9 +162,9 @@
       "analyzing": "Analizowanie Twoich notatek pod kątem sugestii etykiet...",
       "create": "Utwórz",
       "createNewLabel": "Utwórz nową etykietę",
-      "created": "{count} labels created successfully",
+      "created": "{count} etykiet utworzono pomyślnie",
       "creating": "Tworzenie etykiet...",
-      "description": "I've detected recurring themes in \"{notebookName}\" ({totalNotes} notes). Create labels for them?",
+      "description": "Wykryłem powtarzające się tematy w \"{notebookName}\" ({totalNotes} notatkach). Utworzyć dla nich etykiety?",
       "error": "Failed to fetch label suggestions",
       "new": "(nowa)",
       "noLabelsSelected": "No labels selected",
@@ -602,14 +608,14 @@
   "memoryEcho": {
     "clickToView": "Kliknij, aby wyświetlić",
     "comparison": {
-      "clickToView": "Click to view note",
-      "helpful": "Helpful",
-      "helpfulQuestion": "Is this comparison helpful?",
-      "highSimilarityInsight": "These notes deal with the same topic with a high degree of similarity. They could be merged or consolidated.",
-      "notHelpful": "Not Helpful",
-      "similarityInfo": "These notes are connected by {similarity}% similarity",
-      "title": "💡 Note Comparison",
-      "untitled": "Untitled"
+      "title": "💡 Porównanie notatek",
+      "similarityInfo": "Te notatki są połączone przez {similarity}% podobieństwa",
+      "highSimilarityInsight": "Te notatki dotyczą tego samego tematu z wysokim stopniem podobieństwa. Mogą zostać połączone.",
+      "untitled": "Bez tytułu",
+      "clickToView": "Kliknij aby wyświetlić notatkę",
+      "helpfulQuestion": "Czy to porównanie jest pomocne?",
+      "helpful": "Pomocne",
+      "notHelpful": "Nie pomocne"
     },
     "connection": "connection",
     "connections": "Connections",
@@ -618,40 +624,40 @@
     "description": "Proactive connections between your notes",
     "dismiss": "Dismiss for now",
     "editorSection": {
-      "close": "Zamknij",
-      "compare": "Compare",
-      "compareAll": "Compare all",
-      "loading": "Loading...",
-      "merge": "Merge",
-      "mergeAll": "Merge all",
-      "title": "⚡ Connected Notes ({count})",
-      "view": "View"
+      "title": "⚡ Połączone notatki ({count})",
+      "loading": "Ładowanie...",
+      "view": "Wyświetl",
+      "compare": "Porównaj",
+      "merge": "Połącz",
+      "compareAll": "Porównaj wszystko",
+      "mergeAll": "Połącz wszystko",
+      "close": "Zamknij"
     },
-    "fused": "Fused",
+    "fused": "Połączono",
     "fusion": {
-      "archiveOriginals": "Archive original notes",
-      "cancel": "Cancel",
-      "confirmFusion": "Confirm fusion",
-      "createBacklinks": "Create backlink to original notes",
-      "edit": "Edit",
-      "error": "Failed to merge notes",
-      "finishEditing": "Finish editing",
-      "generateError": "Failed to generate fusion",
-      "generateFusion": "Generate the fusion",
-      "generating": "Generating...",
-      "keepAllTags": "Keep all tags",
-      "mergeNotes": "Merge {count} note(s)",
-      "modify": "Modify",
-      "noContentReturned": "No fusion content returned from API",
-      "notesToMerge": "📝 Notes to merge",
-      "optionalPrompt": "💬 Fusion prompt (optional)",
-      "optionsTitle": "Fusion options",
-      "previewTitle": "📝 Preview of merged note",
-      "promptPlaceholder": "Optional instructions for AI (e.g., 'Keep the formal style of note 1')...",
-      "success": "Notes merged successfully!",
-      "title": "🔗 Intelligent Fusion",
-      "unknownDate": "Unknown date",
-      "useLatestTitle": "Use latest note as title"
+      "title": "🔗 Inteligentne fuzja",
+      "mergeNotes": "Połącz {count} notatkę/i",
+      "notesToMerge": "📝 Notatki do połączenia",
+      "optionalPrompt": "💬 Prompt fuzji (opcjonalny)",
+      "promptPlaceholder": "Opcjonalne instrukcje dla AI (np. 'Zachowaj formalny styl notatki 1')...",
+      "generateFusion": "Wygeneruj fuzję",
+      "generating": "Generowanie...",
+      "previewTitle": "📝 Podgląd połączonej notatki",
+      "edit": "Edytuj",
+      "modify": "Modyfikuj",
+      "finishEditing": "Zakończ edycję",
+      "optionsTitle": "Opcje fuzji",
+      "archiveOriginals": "Archiwizuj oryginalne notatki",
+      "keepAllTags": "Zachowaj wszystkie tagi",
+      "useLatestTitle": "Użyj najnowszej notatki jako tytułu",
+      "createBacklinks": "Utwórz link do oryginalnych notatek",
+      "cancel": "Anuluj",
+      "confirmFusion": "Potwierdź fuzję",
+      "success": "Notatki połączone pomyślnie!",
+      "error": "Nie udało się połączyć notatek",
+      "generateError": "Nie udało się wygenerować fuzji",
+      "noContentReturned": "Brak zawartości fuzji z API",
+      "unknownDate": "Nieznana data"
     },
     "helpful": "Helpful",
     "insightReady": "Your insight is ready!",