Add screenshot page, add polling screenshots, better screenshot memory cleanup, better visualization/no jitter when screenshots are shown now.

Overlord-Server/public/assets/nav/role-ui.js

@@ -75,3 +75,14 @@ export function applyUserRoleUI(user, refs) {
     unhide("file-share-link");
   }
 }
+
+export async function applyThumbnailWallVisibility(user) {
+  if (!user || user.role === "viewer") return;
+  try {
+    const res = await fetch("/api/settings/thumbnails", { credentials: "include" });
+    if (!res.ok) return;
+    const data = await res.json();
+    if (data?.thumbnails?.wallEnabled === false) return;
+    document.querySelectorAll("#screenshots-link").forEach((el) => el.classList.remove("hidden"));
+  } catch {}
+}

Overlord-Server/public/assets/nav/template.js

@@ -63,6 +63,7 @@ export const NAV_GROUPS = [
     iconColor: "text-emerald-400",
     children: [
       { href: "/metrics",       label: "Metrics",        icon: "fa-chart-line",      iconColor: "text-emerald-400", linkId: "metrics-link" },
+      { href: "/screenshots",   label: "Screenshot Wall", icon: "fa-images",         iconColor: "text-sky-400",     linkId: "screenshots-link",   hidden: true },
     ],
   },
   {