feat: add changelog page and update navigation links

src/init/i18n/locales/BritishEnglish.json

@@ -8,6 +8,7 @@
     "home": "Home",
     "about": "About",
     "contact": "Contact",
+    "changelog": "Changelog",
     "tools": "Tools",
     "jsonProcessing": "JSON Processing",
     "dailyTools": "Daily Tools",
@@ -43,6 +44,10 @@
     "contact": {
       "title": "Contact DevLab",
       "description": "Get in touch via GitHub Issues for support, bug reports, or feature requests."
+    },
+    "changelog": {
+      "title": "Changelog",
+      "description": "A complete history of updates and improvements to DevLab."
     }
   },
   "home": {
@@ -170,5 +175,13 @@
     "scale": {
       "title": "BMI Categories"
     }
+  },
+  "changelog": {
+    "title": "Changelog",
+    "description": "All notable changes to DevLab are documented here.",
+    "featureType": "Feature",
+    "fixType": "Fix",
+    "refactorType": "Refactor",
+    "choreType": "Chore"
   }
 }

src/init/i18n/locales/SimplifiedChinese.json

@@ -8,6 +8,7 @@
     "home": "首页",
     "about": "关于",
     "contact": "联系",
+    "changelog": "更新日志",
     "tools": "工具",
     "jsonProcessing": "JSON 处理",
     "dailyTools": "日常小工具",
@@ -43,6 +44,10 @@
     "contact": {
       "title": "联系 DevLab",
       "description": "通过 GitHub Issues 反馈问题或提交功能需求。"
+    },
+    "changelog": {
+      "title": "更新日志",
+      "description": "DevLab 完整的更新和改进历史记录。"
     }
   },
   "home": {
@@ -170,5 +175,13 @@
     "scale": {
       "title": "BMI 分类"
     }
+  },
+  "changelog": {
+    "title": "更新日志",
+    "description": "DevLab 所有值得关注的变更都记录在此。",
+    "featureType": "功能",
+    "fixType": "修复",
+    "refactorType": "重构",
+    "choreType": "维护"
   }
 }

src/layout/hero-layout/index.tsx

@@ -43,6 +43,12 @@ export default function HeroLayout() {
                 >
                   {t("navigation.contact")}
                 </Link>
+                <Link
+                  to="/changelog"
+                  className="text-gray-500 hover:text-gray-900 px-3 py-2 rounded-md text-sm font-medium"
+                >
+                  {t("navigation.changelog")}
+                </Link>
               </nav>
               <LanguageSwitcher />
             </div>

src/layout/tools-layout/index.tsx

@@ -38,22 +38,24 @@ export default function ToolsLayout() {
               <nav className="flex space-x-8">
                 <Link
                   to="/"
-                  className="text-gray-500 hover:text-gray-900 px-3 py-2 rounded-md text-sm font-medium"
+                  className="text-gray-500 hover:text-gray-900 px-3 py-2 rounded-md text-sm font-medium">
-                >
                   {t("navigation.home")}
                 </Link>
                 <Link
                   to="/about"
-                  className="text-gray-500 hover:text-gray-900 px-3 py-2 rounded-md text-sm font-medium"
+                  className="text-gray-500 hover:text-gray-900 px-3 py-2 rounded-md text-sm font-medium">
-                >
                   {t("navigation.about")}
                 </Link>
                 <Link
                   to="/contact"
-                  className="text-gray-500 hover:text-gray-900 px-3 py-2 rounded-md text-sm font-medium"
+                  className="text-gray-500 hover:text-gray-900 px-3 py-2 rounded-md text-sm font-medium">
-                >
                   {t("navigation.contact")}
                 </Link>
+                <Link
+                  to="/changelog"
+                  className="text-gray-500 hover:text-gray-900 px-3 py-2 rounded-md text-sm font-medium">
+                  {t("navigation.changelog")}
+                </Link>
               </nav>
               <LanguageSwitcher />
             </div>
@@ -66,8 +68,7 @@ export default function ToolsLayout() {
           <aside
             className={`bg-white rounded-xl shadow-sm border border-slate-200 flex flex-col transition-all duration-200 ${
               collapsed ? "w-16" : "w-56"
-            }`}
+            }`}>
-          >
             <div className="px-3 py-3 border-b border-slate-200 flex items-center justify-between">
               {!collapsed && (
                 <span className="text-xs font-semibold uppercase tracking-wider text-slate-500">
@@ -80,8 +81,7 @@ export default function ToolsLayout() {
                 className="w-8 h-8 rounded-md border border-slate-200 text-slate-600 hover:bg-slate-50 transition-colours text-sm"
                 aria-label={
                   collapsed ? t("navigation.expandToolsMenu") : t("navigation.collapseToolsMenu")
-                }
+                }>
-              >
                 {collapsed ? "»" : "«"}
               </button>
             </div>
@@ -105,8 +105,7 @@ export default function ToolsLayout() {
                             : "text-slate-600 hover:bg-slate-100 hover:text-slate-900"
                         }`
                       }
-                      title={collapsed ? `${group.title} · ${tool.label}` : tool.label}
+                      title={collapsed ? `${group.title} · ${tool.label}` : tool.label}>
-                    >
                       {collapsed ? tool.shortLabel : tool.label}
                     </NavLink>
                   ))}

src/page/changelog/index.tsx

@@ -0,0 +1,142 @@
+import { useMemo } from "react"
+import { useTranslation } from "react-i18next"
+import Seo from "@/components/seo"
+
+interface ChangeEntry {
+  type: "feat" | "fix" | "refactor" | "chore"
+  title: string
+  description?: string
+  date?: string
+}
+
+interface ChangelogVersion {
+  version: string
+  date: string
+  entries: ChangeEntry[]
+}
+
+const CHANGELOG_DATA: ChangelogVersion[] = [
+  {
+    version: "1.1.0",
+    date: "2026-02-24",
+    entries: [
+      {
+        type: "feat",
+        title: "JSON Grid",
+        description: "Convert JSON arrays into sortable table view with CSV export functionality"
+      },
+      {
+        type: "feat",
+        title: "Tools Layout with Collapsible Menu",
+        description: "Added a dedicated tools layout with categorised sidebar menu for quick tool switching",
+      },
+      {
+        type: "feat",
+        title: "Copy Selected JSON Feature",
+        description: "Added ability to copy JSONPath selected data as raw JSON with one-click action",
+      },
+      {
+        type: "feat",
+        title: "Tool Categories",
+        description: "Organised tools into JSON Processing (JSON Viewer, JSON Grid) and Daily Tools (BMI Calculator)",
+      },
+      {
+        type: "fix",
+        title: "Live Application Link",
+        description: "Updated live application link in README",
+      },
+    ],
+  },
+  {
+    version: "1.0.0",
+    date: "2026-01-19",
+    entries: [
+      {
+        type: "feat",
+        title: "JSON Viewer with JSONPath",
+        description: "Full-featured JSON viewer with JSONPath query support and CSV export",
+      },
+      {
+        type: "feat",
+        title: "BMI Calculator",
+        description: "Calculate Body Mass Index with category guidance and health advice",
+      },
+      {
+        type: "feat",
+        title: "Internationalization",
+        description: "Support for English (GB) and Simplified Chinese with language switcher",
+      },
+    ],
+  },
+]
+
+type ChangeTypeKey = "feat" | "fix" | "refactor" | "chore"
+
+export default function Changelog() {
+  const { t } = useTranslation()
+
+  const changeTypeLabels = useMemo(() => {
+    const labels: Record<ChangeTypeKey, { label: string; colour: string }> = {
+      feat: { label: t("changelog.featureType"), colour: "bg-emerald-100 text-emerald-700" },
+      fix: { label: t("changelog.fixType"), colour: "bg-blue-100 text-blue-700" },
+      refactor: { label: t("changelog.refactorType"), colour: "bg-purple-100 text-purple-700" },
+      chore: { label: t("changelog.choreType"), colour: "bg-slate-100 text-slate-700" },
+    }
+    return labels
+  }, [t])
+
+  return (
+    <div className="min-h-screen bg-gray-50">
+      <Seo
+        title={t("seo.changelog.title")}
+        description={t("seo.changelog.description")}
+        path="/changelog"
+      />
+
+      {/* Header */}
+      <div className="bg-white shadow-sm border-b">
+        <div className="max-w-4xl mx-auto px-4 py-12 sm:px-6 lg:px-8">
+          <h1 className="text-4xl font-bold text-gray-900">{t("changelog.title")}</h1>
+          <p className="mt-2 text-lg text-gray-600">{t("changelog.description")}</p>
+        </div>
+      </div>
+
+      {/* Timeline */}
+      <div className="max-w-4xl mx-auto px-4 py-12 sm:px-6 lg:px-8">
+        <div className="space-y-8">
+          {CHANGELOG_DATA.map((changelog) => (
+            <div key={changelog.version} className="relative">
+              {/* Version header */}
+              <div className="flex items-baseline gap-4 mb-6">
+                <h2 className="text-2xl font-bold text-gray-900">v{changelog.version}</h2>
+                <time className="text-sm text-gray-500">{changelog.date}</time>
+              </div>
+
+              {/* Changes list */}
+              <div className="space-y-4">
+                {changelog.entries.map((entry, idx) => {
+                  const typeInfo = changeTypeLabels[entry.type as ChangeTypeKey]
+                  return (
+                    <div key={`${changelog.version}-${idx}`} className="bg-white rounded-lg border border-slate-200 p-4">
+                      <div className="flex items-start gap-3">
+                        <span className={`inline-block px-2.5 py-0.5 rounded text-xs font-semibold ${typeInfo.colour}`}>
+                          {typeInfo.label}
+                        </span>
+                        <div className="flex-1">
+                          <h3 className="text-base font-semibold text-gray-900">{entry.title}</h3>
+                          {entry.description && (
+                            <p className="mt-1 text-sm text-gray-600">{entry.description}</p>
+                          )}
+                        </div>
+                      </div>
+                    </div>
+                  )
+                })}
+              </div>
+            </div>
+          ))}
+        </div>
+      </div>
+    </div>
+  )
+}

src/router/index.tsx

@@ -36,6 +36,10 @@ const router = createBrowserRouter(
           path: "contact",
           lazy: lazy(() => import("@/page/contact")),
         },
+        {
+          path: "changelog",
+          lazy: lazy(() => import("@/page/changelog")),
+        },
       ],
     },
     {