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.json

@@ -129,7 +129,12 @@
         "disabled": "已禁用",
         "customSystemMessage": "自定义系统消息",
         "customSystemMessageDescription": "添加自定义指令，将附加到 AI 的系统提示末尾。",
-        "customSystemMessagePlaceholder": "例如：图表始终使用蓝色配色方案..."
+        "customSystemMessagePlaceholder": "例如：图表始终使用蓝色配色方案...",
+        "panelVisibility": "大厅面板",
+        "panelVisibilityDescription": "选择在聊天大厅显示哪些面板。",
+        "showRecentChats": "最近聊天",
+        "showMyTemplates": "我的模板",
+        "showQuickExamples": "快速示例"
     },
     "save": {
         "title": "保存图表",
@@ -266,6 +271,52 @@
         "searchPlaceholder": "搜索对话...",
         "noResults": "未找到对话"
     },
+    "templates": {
+        "title": "我的模板库",
+        "subtitle": "您的个人 prompt 库，快速创建图表",
+        "emptyTitle": "暂无模板",
+        "emptyDescription": "创建您的第一个模板，开始构建个人 prompt 库",
+        "createFirst": "创建第一个模板",
+        "neverUsed": "未使用过",
+        "usedCount": "使用 {count} 次",
+        "myTemplates": "我的模板",
+        "createTitle": "创建模板",
+        "createDescription": "保存常用 prompt 以便重复使用。模板帮助您快速开始常用工作流。",
+        "promptLabel": "提示词",
+        "promptPlaceholder": "描述您想要创建的图表...",
+        "promptRequired": "提示词不能为空",
+        "titleLabel": "标题",
+        "titlePlaceholder": "输入标题",
+        "titleHint": "留空则使用提示词前 20 个字符作为标题",
+        "descriptionLabel": "描述",
+        "descriptionPlaceholder": "为此模板添加描述",
+        "pinnedLabel": "置顶模板",
+        "pinnedHint": "置顶的模板会显示在列表顶部",
+        "createButton": "创建模板",
+        "createFailed": "创建模板失败，请重试。",
+        "editTitle": "编辑模板",
+        "editDescription": "更新模板内容和设置。",
+        "updateFailed": "更新模板失败，请重试。",
+        "duplicate": "复制",
+        "copySuffix": "(副本)",
+        "deleteTitle": "删除此模板？",
+        "deleteDescription": "此操作将永久删除该模板，无法撤销。",
+        "confirmSendTitle": "替换当前输入？",
+        "confirmSendDescription": "您有未发送的内容。发送此模板将替换它。",
+        "confirmSendButton": "发送模板",
+        "searchPlaceholder": "搜索模板...",
+        "searchNoResults": "没有匹配的模板",
+        "pin": "置顶",
+        "unpin": "取消置顶",
+        "saveAsTemplate": "保存为模板",
+        "exportTemplates": "导出模板",
+        "importTemplates": "导入模板",
+        "exportEmpty": "没有可导出的模板",
+        "exportSuccess": "成功导出 {count} 个模板",
+        "importNoFile": "请选择一个 JSON 文件",
+        "importFailed": "导入失败：{error}",
+        "importSuccess": "成功导入 {imported} 个模板，跳过 {skipped} 个重复"
+    },
     "validation": {
         "title": "验证图表",
         "capturing": "截图中",