feat: add personal My Templates library alongside Quick Examples (#773)

* 增加了ralph自动化编程梳理

* feat: US-001 - 为模板库建立独立的 IndexedDB 存储层

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: US-002 - 在空聊天状态用我的模板库替换官方示例

- 将 ChatLobby 中的 Quick Examples 替换为 TemplatePanel
- 当没有历史会话时，展示完整的模板库面板
- 当有历史会话时，展示可折叠的 "My Templates" 区域
- 使用 TemplatePanel 组件展示用户的个人模板库

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: US-004 - Provide template creation flow

- Create TemplateCreateDialog component with form fields for prompt, title, description, tags, and pinned
- Add i18n translations for template creation UI in en, zh, zh-Hant, ja
- Update TemplatePanel to integrate the create dialog
- Support initialPrompt prop for pre-filling from current input
- Validate required prompt field (empty prompt not allowed)
- Auto-generate default title from first 20 chars of  Pin templates appear at top of list

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: US-005 - 为模板卡片提供编辑、删除和复制操作

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: US-006 - Send template directly on click and record usage statistics

- Implement click-to-send template functionality with confirmation dialog
- Add clickCount and runCount increment logic
- Display runCount and lastUsedAt on template card
- Add i18n translations for confirmation dialog (en, zh, zh-Hant, ja)
- Pass onSendTemplate and currentInput props through component hierarchy

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: US-007 - Support template search, pin and default sorting

- Add search bar to TemplatePanel with real-time filtering by title, description, and tags
- Add pin/unpin toggle button on template cards (uses Bookmark icon with fill indicator)
- Search uses existing searchTemplates function from template-storage
- Sort uses existing sortTemplates function (pinned desc, runCount desc, lastUsedAt desc, updatedAt desc)
- Show empty state with Search icon when search returns no results
- List re-sorts immediately after pin/unpin toggle
- Add i18n keys: searchPlaceholder, searchNoResults, pin, unpin for all 4 languages

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: US-008 - Support saving current input as template

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: US-009 - Support saving historical user message as template

- Add "Save as Template" button to user messages
- Pre-fill prompt with original user message text
- Only show on user messages,- Dialog opens TemplateCreateDialog on click
- Template appears in list immediately after saving

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: US-010 - Support template import and export

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* chore: remove local-only dirs from git tracking (.agents, .cursor, scripts, screenshots)

These directories contain local IDE configs, agent scripts, and
dev tooling that should not be part of the upstream repository.
Added them to .gitignore to prevent future accidental commits.

* chore: remove AGENTS.md from git tracking

* fix: add missing i18n keys for template export/import (en/zh/zh-Hant/ja)

* fix: review fixes for my-templates PR

- Fix fragile querySelector("form") with id-based lookup
- Add objectStoreNames.contains guards for IndexedDB upgrades
- Remove duplicate TemplateSchema, import from template-storage
- Revert contributor-specific .gitignore additions
- Fix broken i18n placeholders and missing translations (zh/ja/zh-Hant)
- Remove unused setFiles prop from ChatLobby
- Remove tags feature (unnecessary complexity)
- Improve template card layout: overlay icons on hover, align stats
- Add break-all and overflow-hidden for long prompt text in dialogs
- Move incrementClickCount into sendTemplate for accurate tracking
- Use Intl.RelativeTimeFormat for locale-aware relative time

* feat: restore Quick Examples panel and add lobby panel visibility settings

Bring back the ExamplePanel as a third collapsible section in ChatLobby
alongside Recent Chats and My Templates. Add toggle switches in Settings
to show/hide each lobby panel, persisted via localStorage.

* fix: template send race condition, import defaults, and empty title bug

- Use flushSync instead of setTimeout(0) in handleSendTemplate to
  ensure React state is flushed before form submission
- Explicitly validate and default all fields in importTemplates to
  prevent undefined counters from malformed import JSON
- Fall back to existing title in edit dialog instead of writing undefined

* fix: address Copilot review comments and remove PRD file

- Fix fallback formatLastUsed returning "Not used yet" for recent usage
- Remove dead mounted flag in TemplatePanel useEffect
- Respect panel visibility settings in no-history lobby state
- Reject empty/whitespace titles in import validation
- Trim title/prompt in importTemplates with default title fallback
- Remove tasks/prd-template-library-replaces-examples.md from repo

* fix: remove double sort, dead code, redundant stats, and break-all CSS

- Remove redundant sortTemplates call in loadTemplates (already sorted by getAllTemplates)
- Remove unused createEmptyTemplateInput and sortTemplates import
- Show "Not used yet" only once for unused templates instead of twice
- Use break-words instead of break-all on prompt textareas

---------

Co-authored-by: 杜雷 <dreamfly@126.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: dayuan.jiang <jdy.toh@gmail.com>

lib/i18n/dictionaries/zh-Hant.json

@@ -129,7 +129,12 @@
         "disabled": "已停用",
         "customSystemMessage": "自訂系統訊息",
         "customSystemMessageDescription": "新增自訂指示，將附加到 AI 的系統提示末尾。",
-        "customSystemMessagePlaceholder": "例如：圖表始終使用藍色配色方案..."
+        "customSystemMessagePlaceholder": "例如：圖表始終使用藍色配色方案...",
+        "panelVisibility": "大廳面板",
+        "panelVisibilityDescription": "選擇在聊天大廳顯示哪些面板。",
+        "showRecentChats": "最近聊天",
+        "showMyTemplates": "我的範本",
+        "showQuickExamples": "快速範例"
     },
     "save": {
         "title": "儲存圖表",
@@ -266,6 +271,52 @@
         "searchPlaceholder": "搜尋對話...",
         "noResults": "未找到對話"
     },
+    "templates": {
+        "title": "我的範本",
+        "subtitle": "快速建立圖表的個人提示庫",
+        "emptyTitle": "尚無範本",
+        "emptyDescription": "建立您的第一個範本，開始構建您的個人提示庫",
+        "createFirst": "建立第一個範本",
+        "neverUsed": "未使用過",
+        "usedCount": "使用 {count} 次",
+        "myTemplates": "我的範本",
+        "createTitle": "建立範本",
+        "createDescription": "儲存常用提示以便重複使用。範本幫助您快速開始常用工作流程。",
+        "promptLabel": "提示",
+        "promptPlaceholder": "描述您想建立的圖表...",
+        "promptRequired": "提示為必填項",
+        "titleLabel": "標題",
+        "titlePlaceholder": "輸入標題",
+        "titleHint": "留空則使用提示的前 20 個字元",
+        "descriptionLabel": "描述",
+        "descriptionPlaceholder": "為此範本新增描述",
+        "pinnedLabel": "釘選範本",
+        "pinnedHint": "釘選的範本會顯示在清單頂部",
+        "createButton": "建立範本",
+        "createFailed": "建立範本失敗，請重試。",
+        "editTitle": "編輯範本",
+        "editDescription": "更新範本內容和設定。",
+        "updateFailed": "更新範本失敗，請重試。",
+        "duplicate": "複製",
+        "copySuffix": "(副本)",
+        "deleteTitle": "刪除此範本？",
+        "deleteDescription": "此操作將永久刪除該範本，無法復原。",
+        "confirmSendTitle": "取代目前輸入？",
+        "confirmSendDescription": "您有未傳送的內容。傳送此範本將取代它。",
+        "confirmSendButton": "傳送範本",
+        "searchPlaceholder": "搜尋範本...",
+        "searchNoResults": "沒有符合的範本",
+        "pin": "置頂",
+        "unpin": "取消置頂",
+        "saveAsTemplate": "儲存為範本",
+        "exportTemplates": "匯出範本",
+        "importTemplates": "匯入範本",
+        "exportEmpty": "沒有可匯出的範本",
+        "exportSuccess": "成功匯出 {count} 個範本",
+        "importNoFile": "請選擇一個 JSON 檔案",
+        "importFailed": "匯入失敗：{error}",
+        "importSuccess": "成功匯入 {imported} 個範本，跳過 {skipped} 個重複"
+    },
     "validation": {
         "title": "驗證圖表",
         "capturing": "截圖中",