Match System panel styling to Live Health: tile grid, accent bar, light-theme tile fix

package.json

@@ -1,6 +1,6 @@
 {
   "name": "site-gateway",
-  "version": "0.11.53",
+  "version": "0.11.54",
   "private": true,
   "description": "Site Gateway: simple self-hosted website publishing, reverse proxying, and automatic HTTPS.",
   "type": "module",

src/public/index.html

@@ -94,16 +94,16 @@
             </div>
             <p id="health-checked" class="checked-time"><span class="live-dot" id="health-live-dot"></span>Last checked —</p>
           </section>
-          <section class="dashboard-panel">
+          <section class="dashboard-panel system-panel">
             <div class="panel-heading"><div><p class="eyebrow">Runtime</p><h2>System</h2></div></div>
             <dl class="system-grid">
-              <div><dt>Uptime</dt><dd id="system-uptime">—</dd></div>
-              <div><dt>Memory</dt><dd id="system-memory">—</dd></div>
-              <div><dt>Site Gateway data</dt><dd id="system-data">—</dd><small>Used by sites and configuration</small></div>
-              <div><dt>Storage available</dt><dd id="system-disk">—</dd><small>Available on the /data volume</small></div>
-              <div><dt>Site Gateway</dt><dd id="system-app-version">—</dd></div>
-              <div><dt>Caddy</dt><dd id="system-caddy-version">—</dd></div>
-              <div><dt>Database</dt><dd id="system-database">—</dd><small id="system-database-detail">SQLite storage</small></div>
+              <div class="system-tile"><dt>Uptime</dt><dd id="system-uptime">—</dd></div>
+              <div class="system-tile"><dt>Memory</dt><dd id="system-memory">—</dd></div>
+              <div class="system-tile"><dt>Site Gateway data</dt><dd id="system-data">—</dd><small>Used by sites and configuration</small></div>
+              <div class="system-tile"><dt>Storage available</dt><dd id="system-disk">—</dd><small>Available on the /data volume</small></div>
+              <div class="system-tile"><dt>Site Gateway</dt><dd id="system-app-version">—</dd></div>
+              <div class="system-tile"><dt>Caddy</dt><dd id="system-caddy-version">—</dd></div>
+              <div class="system-tile"><dt>Database</dt><dd id="system-database">—</dd><small id="system-database-detail">SQLite storage</small></div>
             </dl>
           </section>
         </div>