feat(dashboard): delete button on server detail page

The DELETE /v1/servers/:id endpoint existed (tears down the runner
container + removes the row) but nothing in the UI called it, so
servers could only be removed via SSH+psql. Adds a danger-variant
button in the top-right of the detail header with a native confirm,
spinner state, and inline error surfacing. Redirects to /servers
on success.

apps/web/app/(dashboard)/servers/[id]/page.tsx

@@ -1,7 +1,7 @@
 'use client';
 
 import { useEffect, useState } from 'react';
-import { useParams } from 'next/navigation';
+import { useParams, useRouter } from 'next/navigation';
 import { apiFetch } from '@/lib/api';
 import { StatusPill } from '@/components/status-pill';
 import { CodeBlock } from '@/components/code-block';
@@ -38,11 +38,14 @@ type Tab = 'overview' | 'tools' | 'logs' | 'metrics' | 'secrets' | 'iterate' | '
 
 export default function ServerDetailPage() {
   const params = useParams<{ id: string }>();
+  const router = useRouter();
   const [server, setServer] = useState<ServerDetail | null>(null);
   const [builds, setBuilds] = useState<BuildSummary[]>([]);
   const [tab, setTab] = useState<Tab>('overview');
   const [iteratePrompt, setIteratePrompt] = useState('');
   const [latestBuildId, setLatestBuildId] = useState<string | null>(null);
+  const [deleting, setDeleting] = useState(false);
+  const [deleteError, setDeleteError] = useState<string | null>(null);
 
   async function refresh() {
     const r = await apiFetch<{ server: ServerDetail; builds: BuildSummary[] }>(
@@ -72,6 +75,27 @@ export default function ServerDetailPage() {
     setTab('logs');
   }
 
+  async function onDelete() {
+    if (!server) return;
+    // Destructive — the running container is torn down and the row is gone.
+    // Browser confirm is enough at this scope (single operator, no users yet);
+    // upgrade to a typed-confirmation dialog once we have customer-tier data.
+    const sure = window.confirm(
+      `Delete "${server.name}" (${server.slug})? The running container is stopped and the server row is removed. This cannot be undone.`,
+    );
+    if (!sure) return;
+    setDeleting(true);
+    setDeleteError(null);
+    try {
+      await apiFetch(`/v1/servers/${server.id}`, { method: 'DELETE' });
+      router.push('/servers');
+    } catch (e) {
+      const detail = (e as { detail?: { error?: string; detail?: string } }).detail;
+      setDeleteError(detail?.detail ?? detail?.error ?? (e as Error).message);
+      setDeleting(false);
+    }
+  }
+
   if (!server) {
     return (
       <div className="mx-auto max-w-7xl px-6 py-8 text-[12.5px] text-[--color-fg-muted]">Loading…</div>
@@ -114,6 +138,16 @@ export default function ServerDetailPage() {
               </>
             )}
           </div>
+          {deleteError && (
+            <div className="mt-2 text-[12px] text-[--color-danger]">
+              Delete failed: {deleteError}
+            </div>
+          )}
+        </div>
+        <div className="flex shrink-0 items-center gap-2">
+          <Button variant="danger" size="sm" onClick={onDelete} disabled={deleting}>
+            {deleting ? 'Deleting…' : 'Delete server'}
+          </Button>
         </div>
       </div>