Various QOL updates

src/pages/admin/UserManagementPage.tsx

@@ -1363,6 +1363,34 @@ export default function UserManagementPage() {
         </DialogContent>
       </Dialog>
 
+      {/* ── Suspend confirmation dialog ─────────────────────────────────────── */}
+      <Dialog open={showSuspendConfirm} onOpenChange={setShowSuspendConfirm}>
+        <DialogContent className="sm:max-w-md">
+          <DialogHeader>
+            <DialogTitle className="flex items-center gap-2 text-red-600">
+              <AlertTriangle className="w-5 h-5" />
+              Suspend account?
+            </DialogTitle>
+            <DialogDescription>
+              <strong>{user?.full_name || user?.email}</strong> will be blocked from requesting SSH certificates. You can restore their access at any time.
+            </DialogDescription>
+          </DialogHeader>
+          <DialogFooter>
+            <Button variant="outline" onClick={() => setShowSuspendConfirm(false)} disabled={isSuspending}>
+              Cancel
+            </Button>
+            <Button
+              variant="destructive"
+              onClick={handleSuspend}
+              disabled={isSuspending}
+            >
+              {isSuspending && <Loader2 className="w-4 h-4 mr-2 animate-spin" />}
+              Suspend
+            </Button>
+          </DialogFooter>
+        </DialogContent>
+      </Dialog>
+
       {/* ── Admin add SSH key dialog ──────────────────────────────────────────── */}
       <Dialog
         open={showAddKey}