fix: deregister coi-serviceworker in iframe mode

When the page is in an iframe, deregister any existing service worker
that was registered from a previous direct visit. This prevents the
COEP headers from blocking cross-origin resources in the HF Space iframe.

Co-Authored-By: Claude <noreply@anthropic.com>

trigo-web/app/dist/index.html

@@ -8,8 +8,10 @@
 		<!-- Enable cross-origin isolation for SharedArrayBuffer (needed for ONNX multi-threading) -->
 		<!-- Skip service worker in iframe to avoid COOP blocking - AI will use single-thread mode -->
 		<script>
+			const isInIframe = window.top !== window.self;
 			window.coi = {
-				shouldRegister: () => window.top === window.self,  // Only register when not in iframe
+				shouldRegister: () => !isInIframe,  // Only register when not in iframe
+				shouldDeregister: () => isInIframe, // Deregister if in iframe (from previous direct visit)
 				quiet: true
 			};
 		</script>

trigo-web/app/index.html

@@ -8,8 +8,10 @@
 		<!-- Enable cross-origin isolation for SharedArrayBuffer (needed for ONNX multi-threading) -->
 		<!-- Skip service worker in iframe to avoid COOP blocking - AI will use single-thread mode -->
 		<script>
+			const isInIframe = window.top !== window.self;
 			window.coi = {
-				shouldRegister: () => window.top === window.self,  // Only register when not in iframe
+				shouldRegister: () => !isInIframe,  // Only register when not in iframe
+				shouldDeregister: () => isInIframe, // Deregister if in iframe (from previous direct visit)
 				quiet: true
 			};
 		</script>