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/zh.json

@@ -63,7 +63,13 @@
       "tagsGenerationProvider": "标签生成提供商",
       "title": "AI 配置",
       "updateFailed": "更新 AI 设置失败",
-      "updateSuccess": "AI 设置更新成功"
+      "updateSuccess": "AI 设置更新成功",
+      "bestValue": "最佳性价比",
+      "bestQuality": "最佳质量",
+      "providerOllamaOption": "🦙 Ollama (Local & Free)",
+      "providerOpenAIOption": "🤖 OpenAI (GPT-5, GPT-4)",
+      "providerCustomOption": "🔧 Custom OpenAI-Compatible",
+      "saved": "(已保存)"
     },
     "aiTest": {
       "description": "测试您的 AI 提供商的标签生成和语义搜索嵌入",
@@ -153,34 +159,36 @@
     "analyzing": "AI 分析中...",
     "assistant": "AI 助手",
     "autoLabels": {
-      "analyzing": "正在分析您的笔记以获取标签建议...",
+      "error": "获取标签建议失败",
+      "noLabelsSelected": "未选择标签",
+      "created": "成功创建 {count} 个标签",
+      "analyzing": "正在分析您的笔记...",
+      "title": "新标签建议",
+      "description": "我在\"{notebookName}\"（{totalNotes} 条笔记）中检测到了重复主题。要为它们创建标签吗？",
+      "note": "条笔记",
+      "notes": "条笔记",
+      "typeContent": "输入内容以获取标签建议...",
+      "createNewLabel": "创建此新标签并添加",
+      "new": "（新）",
       "create": "创建",
-      "createNewLabel": "Create this new label and add it",
-      "created": "{count} labels created successfully",
       "creating": "正在创建标签...",
-      "description": "I've detected recurring themes in \"{notebookName}\" ({totalNotes} notes). Create labels for them?",
-      "error": "Failed to fetch label suggestions",
-      "new": "(新建)",
-      "noLabelsSelected": "No labels selected",
-      "note": "note",
-      "notes": "notes",
-      "title": "标签建议",
-      "typeContent": "Type content to get label suggestions..."
+      "notesCount": "{count} 条笔记",
+      "typeForSuggestions": "输入内容以获取标签建议..."
     },
     "batchOrganization": {
-      "analyzing": "Analyzing your notes...",
-      "apply": "Apply",
-      "applyFailed": "Failed to apply organization plan",
-      "applying": "Applying...",
-      "description": "AI将分析您的笔记并建议将它们组织到笔记本中。",
-      "error": "Failed to create organization plan",
-      "noNotebooks": "No notebooks available. Create notebooks first to organize your notes.",
-      "noNotesSelected": "No notes selected",
-      "noSuggestions": "AI could not find a good way to organize these notes.",
-      "selectAllIn": "Select all notes in {notebook}",
-      "selectNote": "Select note: {title}",
-      "success": "{count} notes moved successfully",
-      "title": "Organize with AI"
+      "title": "使用 AI 整理",
+      "description": "AI 将分析您的笔记并建议将它们整理到笔记本中。",
+      "analyzing": "正在分析您的笔记...",
+      "noNotebooks": "没有可用的笔记本。请先创建笔记本。",
+      "noSuggestions": "AI 无法找到整理这些笔记的好方法。",
+      "apply": "应用",
+      "applying": "正在应用...",
+      "success": "成功移动 {count} 条笔记",
+      "error": "创建整理计划失败",
+      "noNotesSelected": "未选择笔记",
+      "applyFailed": "应用整理计划失败",
+      "selectAllIn": "选择 {notebook} 中的所有笔记",
+      "selectNote": "选择笔记：{title}"
     },
     "clarify": "澄清",
     "clickToAddTag": "点击添加此标签",