fix(pages): 修复 TypeScript 错误、硬编码字符串，移除死代码

- 修复 LiveClock.tsx CopyButton size 属性类型错误 (small → sm)
- 修复 ToolCard.tsx 紫色 RGB 值拼写错误 (147,51,2 purple → 147,51,232)
- 替换 4 处硬编码中文为 i18n 调用 (StorageCleaner, JsonTools)
- MarkdownToHtml 预览链接色改为 CSS 变量以支持暗黑模式
- 移除 Base64Converter 中已被 Base64ConverterSection 替代的死代码
  (FileMode.tsx, ImageMode.tsx 及其测试文件)
- 更新 README.md 移除对已删除文件的引用

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

i18n/locales/en/jsonDiff.json

@@ -15,6 +15,7 @@
   "diffCount": "{{count}} differences",
   "invalidJson": "Invalid JSON format",
   "emptyHint": "Enter JSON on both sides and click Compare",
+  "fixErrorHint": "Fix the JSON syntax errors above to enable live comparison",
   "added": "Added",
   "removed": "Removed",
   "modified": "Modified"

i18n/locales/en/jsonFormat.json

@@ -14,6 +14,7 @@
   "noContent": "Nothing to copy",
   "invalidJson": "Invalid JSON format",
   "emptyHint": "Enter JSON and click Format",
+  "fixErrorHint": "Fix the JSON syntax errors above to enable live formatting",
   "originalSize": "Original size",
   "formattedSize": "Formatted size",
   "diffMode": "Diff",

i18n/locales/en/storageCleaner.json

@@ -2,6 +2,7 @@
   "pageTitle": "Storage Cleaner",
   "pageSubtitle": "Clear cache, cookies, and local storage",
   "loading": "Loading...",
+  "initializing": "Reading site data...",
   "occupied": "Occupied {{size}}",
   "cleaning": "Cleaning...",
   "cleanNow": "Clean Now",

i18n/locales/zh/jsonDiff.json

@@ -15,6 +15,7 @@
   "diffCount": "{{count}} 处差异",
   "invalidJson": "无效的 JSON 格式",
   "emptyHint": "输入两侧 JSON 后点击比较",
+  "fixErrorHint": "请修正上方 JSON 的语法错误以开启实时流式比对",
   "added": "新增",
   "removed": "删除",
   "modified": "修改"

i18n/locales/zh/jsonFormat.json

@@ -14,6 +14,7 @@
   "noContent": "无内容可复制",
   "invalidJson": "无效的 JSON 格式",
   "emptyHint": "输入 JSON 后点击格式化",
+  "fixErrorHint": "请修正上方 JSON 的语法错误以开启实时流式格式化",
   "originalSize": "原始大小",
   "formattedSize": "格式化后大小",
   "diffMode": "差异比较",

i18n/locales/zh/storageCleaner.json

@@ -2,6 +2,7 @@
   "pageTitle": "存储清理",
   "pageSubtitle": "清理缓存、Cookies 及本地存储",
   "loading": "加载中...",
+  "initializing": "正在读取站点数据...",
   "occupied": "已占用 {{size}}",
   "cleaning": "正在清理...",
   "cleanNow": "立即清理",