Add configurable TIMEZONE for web UI display (UTC storage preserved)

server/templates/dashboard.html

@@ -86,7 +86,7 @@
             <td>{{ c.current_cpu_percent | round(1) if c.current_cpu_percent is not none else '-' }}%</td>
             <td>{{ c.current_ram_percent | round(1) if c.current_ram_percent is not none else '-' }}%</td>
             <td>{{ c.os_info or '-' }}</td>
-            <td class="last-seen">{% if c.last_seen %}{{ c.last_seen.strftime('%Y-%m-%d %H:%M') }}{% else %}-{% endif %}</td>
+            <td class="last-seen">{{ c.last_seen | localtime }}</td>
             <td>
                 <a href="/computers/{{ c.id }}" class="btn btn-sm btn-outline-primary">Детали</a>
                 {% if user.role == 'admin' %}
@@ -116,6 +116,22 @@ function formatCurrentUser(value) {
     return escapeHtml(value);
 }
 
+function formatServerTime(isoString) {
+    if (!isoString) return '-';
+    const d = new Date(isoString);
+    const parts = new Intl.DateTimeFormat('sv-SE', {
+        timeZone: window.SERVER_TIMEZONE,
+        year: 'numeric', month: '2-digit', day: '2-digit',
+        hour: '2-digit', minute: '2-digit',
+        hour12: false,
+    }).formatToParts(d);
+    const p = {};
+    for (const part of parts) {
+        if (part.type !== 'literal') p[part.type] = part.value;
+    }
+    return `${p.year}-${p.month}-${p.day} ${p.hour}:${p.minute}`;
+}
+
 function currentQuery() {
     return new URLSearchParams(window.location.search).toString();
 }
@@ -173,7 +189,7 @@ async function loadDashboard() {
                 <td>${c.current_cpu_percent != null ? c.current_cpu_percent.toFixed(1) : '-'}%</td>
                 <td>${c.current_ram_percent != null ? c.current_ram_percent.toFixed(1) : '-'}%</td>
                 <td>${escapeHtml(c.os_info || '-')}</td>
-                <td class="last-seen">${c.last_seen ? c.last_seen.replace('T', ' ').slice(0, 16) : '-'}</td>
+                <td class="last-seen">${formatServerTime(c.last_seen)}</td>
                 <td>
                     <a href="/computers/${c.id}" class="btn btn-sm btn-outline-primary">Детали</a>
                     ${isAdmin ? `<button class="btn btn-sm btn-outline-danger delete-pc" data-id="${c.id}" data-hostname="${escapeHtml(c.hostname)}">Удалить</button>` : ''}