add more details to sharp + hopefully let me know if it's broken for people on linux.

Overlord-Server/public/assets/data.js

@@ -4,12 +4,14 @@ import { digestData } from "./utils.js";
 const POLL_INTERVAL_MS = 5000;
 const FALLBACK_POLL_MS = 30000;
 const PREF_REFRESH_KEY = "overlord_refresh_interval_seconds";
+const THUMBNAIL_COOLDOWN_MS = 60000;
 let pollTimer = null;
 let render = () => {};
 let dashboardWs = null;
 let dashboardWsConnected = false;
 let wsReconnectTimer = null;
 const manuallyDisconnecting = new Set();
+const thumbnailRequestedAt = new Map();
 
 function moveClientCardImmediately(msg) {
   const clientId = typeof msg?.clientId === "string" ? msg.clientId : "";
@@ -74,10 +76,7 @@ export async function loadWithOptions(options = {}) {
     const pag = document.getElementById("pagination");
     if (pag) pag.style.visibility = "";
     
-    if (!state.thumbnailsRequested) {
-      state.thumbnailsRequested = true;
-      requestThumbnailsForClients(data.items);
-    }
+    requestThumbnailsForClients(data.items);
   } catch (err) {
     console.error("load clients", err);
   } finally {
@@ -93,8 +92,14 @@ export async function loadWithOptions(options = {}) {
 }
 
 async function requestThumbnailsForClients(items) {
-  const onlineClientsWithoutThumbnail = items.filter(c => c.online && !c.thumbnail);
+  const now = Date.now();
+  const onlineClientsWithoutThumbnail = items.filter(c => {
+    if (!c.online || c.thumbnail) return false;
+    const last = thumbnailRequestedAt.get(c.id);
+    return !last || now - last > THUMBNAIL_COOLDOWN_MS;
+  });
   for (const client of onlineClientsWithoutThumbnail) {
+    thumbnailRequestedAt.set(client.id, now);
     await requestThumbnail(client.id);
   }
 }
@@ -176,6 +181,7 @@ function connectDashboardWs() {
     console.warn("[dashboard] ws closed");
     dashboardWs = null;
     dashboardWsConnected = false;
+    thumbnailRequestedAt.clear();
     adjustPollingForWs();
     scheduleDashboardReconnect();
   };

Overlord-Server/public/assets/state.js

@@ -11,5 +11,4 @@ export const state = {
   isLoading: false,
   pendingForce: false,
   pendingReorder: false,
-  thumbnailsRequested: false,
 };

Overlord-Server/src/thumbnails.ts

@@ -1,9 +1,17 @@
-let _sharp: typeof import("sharp") extends { default: infer D } ? D : never;
-async function getSharp() {
-  if (!_sharp) {
-    _sharp = (await import("sharp")).default;
+let _sharp: (typeof import("sharp") extends { default: infer D } ? D : never) | null = null;
+let _sharpLoadAttempted = false;
+
+async function getSharp(): Promise<typeof import("sharp") extends { default: infer D } ? D : never> {
+  if (_sharp) return _sharp;
+  if (_sharpLoadAttempted) throw new Error("sharp module unavailable");
+  _sharpLoadAttempted = true;
+  try {
+    _sharp = (await import("sharp")).default as any;
+    return _sharp!;
+  } catch (err) {
+    console.error("[thumbnails] Failed to load sharp module. Thumbnails will be unavailable.", err);
+    throw err;
   }
-  return _sharp;
 }
 
 const THUMBNAIL_WIDTH = Math.max(64, Number(process.env.OVERLORD_THUMBNAIL_WIDTH || 640));
@@ -80,7 +88,8 @@ export async function generateThumbnail(id: string): Promise<boolean> {
     thumbnails.set(id, dataUrl);
     latestFrames.delete(id);
     return true;
-  } catch {
+  } catch (err) {
+    console.error(`[thumbnails] Failed to generate thumbnail for client ${id}:`, err);
     return false;
   }
 }