feat: Implement light/dark theme toggle and enhance UI components

- Added theme.js for managing light/dark mode with user preference persistence.
- Updated lab.php to include theme toggle button and adjust styles for light mode.
- Enhanced CSS styles in style.css for light theme support, including background and text colors.
- Introduced DNS record lookup functionality in tools.php with user input for domain queries.
- Improved UI for DNS lookup and outbound connectivity tests in tools.php.
- Added historical benchmark trend chart in lab.php to visualize previous benchmark scores.
- Refactored various UI elements for better spacing and alignment across components.

style.css

@@ -38,6 +38,54 @@
     --radius-xl: 22px;
 }
 
+[data-theme="light"] {
+    --bg-base: #f8fafc;
+    --bg-surface: rgba(255, 255, 255, 0.9);
+    --bg-surface-elevated: rgba(241, 245, 249, 0.95);
+    --bg-subtle: rgba(0, 0, 0, 0.03);
+    
+    --border-subtle: rgba(0, 0, 0, 0.08);
+    --border-hover: rgba(0, 0, 0, 0.16);
+    --border-accent: rgba(14, 165, 233, 0.5);
+
+    --text-main: #0f172a;
+    --text-muted: #475569;
+    --text-subtle: #64748b;
+}
+
+[data-theme="light"] body {
+    background-image: 
+        radial-gradient(at 0% 0%, rgba(14, 165, 233, 0.08) 0px, transparent 45%),
+        radial-gradient(at 100% 100%, rgba(139, 92, 246, 0.06) 0px, transparent 45%),
+        radial-gradient(at 50% 50%, rgba(16, 185, 129, 0.04) 0px, transparent 60%);
+}
+
+[data-theme="light"] .navbar {
+    background: rgba(255, 255, 255, 0.85);
+    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.08);
+}
+
+[data-theme="light"] .nav-title {
+    color: #0f172a;
+}
+
+[data-theme="light"] .nav-menu {
+    background: rgba(0, 0, 0, 0.04);
+}
+
+[data-theme="light"] .card {
+    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.06);
+}
+
+[data-theme="light"] .card-title {
+    color: #0f172a;
+}
+
+[data-theme="light"] .metric-box {
+    background: rgba(241, 245, 249, 0.85);
+    border-color: rgba(0, 0, 0, 0.06);
+}
+
 * {
     box-sizing: border-box;
     margin: 0;
@@ -451,6 +499,102 @@ body {
     overflow-y: auto;
 }
 
+/* ==========================================================================
+   Commit Timeline & DNS Badges
+   ========================================================================== */
+.commit-timeline {
+    display: flex;
+    flex-direction: column;
+    gap: 10px;
+    margin-top: 10px;
+}
+
+.commit-item {
+    background: rgba(0, 0, 0, 0.25);
+    border: 1px solid var(--border-subtle);
+    border-radius: var(--radius-md);
+    padding: 12px 14px;
+    transition: all 0.2s ease;
+}
+
+[data-theme="light"] .commit-item {
+    background: rgba(241, 245, 249, 0.7);
+}
+
+.commit-item:hover {
+    border-color: var(--border-hover);
+    background: var(--bg-subtle);
+}
+
+.commit-top {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-bottom: 6px;
+    font-size: 0.8rem;
+}
+
+.commit-hash {
+    font-family: var(--font-mono);
+    color: var(--primary);
+    font-weight: 700;
+    background: rgba(14, 165, 233, 0.1);
+    padding: 2px 6px;
+    border-radius: 4px;
+}
+
+.commit-date {
+    color: var(--text-subtle);
+    font-size: 0.76rem;
+}
+
+.commit-msg {
+    font-size: 0.86rem;
+    color: var(--text-main);
+    font-weight: 500;
+    line-height: 1.4;
+}
+
+.commit-author {
+    font-size: 0.76rem;
+    color: var(--text-muted);
+    margin-top: 4px;
+}
+
+/* DNS Record Pill */
+.dns-pill {
+    display: inline-flex;
+    align-items: center;
+    gap: 6px;
+    background: rgba(0, 0, 0, 0.3);
+    border: 1px solid var(--border-subtle);
+    border-radius: 6px;
+    padding: 4px 10px;
+    font-family: var(--font-mono);
+    font-size: 0.78rem;
+    color: var(--text-main);
+    margin: 3px;
+}
+
+[data-theme="light"] .dns-pill {
+    background: rgba(241, 245, 249, 0.85);
+}
+
+/* Historical Chart Canvas */
+.chart-wrap {
+    width: 100%;
+    height: 140px;
+    background: rgba(0, 0, 0, 0.35);
+    border-radius: var(--radius-md);
+    border: 1px solid var(--border-subtle);
+    margin: 14px 0;
+    position: relative;
+}
+
+[data-theme="light"] .chart-wrap {
+    background: rgba(241, 245, 249, 0.85);
+}
+
 /* ==========================================================================
    Footer
    ========================================================================== */
@@ -472,3 +616,4 @@ body {
     text-decoration: underline;
 }
 
+