Address PR #1214 code review feedback

- Fix template-expanded URIs not rendering: construct synthetic Resource
  from readState.uri when the URI is absent from the resources list
- Fix non-image blob content rendering raw base64: show placeholder
  message; also handle audio blobs properly
- Hide mimeType display when multiple content items to avoid confusion
- Rename ResourceControls selectedTemplate → selectedTemplateUri for
  consistency with selectedUri and selectedResourceUri

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

clients/web/src/components/groups/ResourceControls/ResourceControls.tsx

@@ -22,7 +22,7 @@ export interface ResourceControlsProps {
   templates: ResourceTemplate[];
   subscriptions: InspectorResourceSubscription[];
   selectedUri?: string;
-  selectedTemplate?: string;
+  selectedTemplateUri?: string;
   listChanged: boolean;
   onRefreshList: () => void;
   onSelectUri: (uri: string) => void;
@@ -46,7 +46,7 @@ export function ResourceControls({
   templates,
   subscriptions,
   selectedUri,
-  selectedTemplate,
+  selectedTemplateUri,
   listChanged,
   onRefreshList,
   onSelectUri,
@@ -137,9 +137,9 @@ export function ResourceControls({
                   <ResourceListItem
                     key={template.uriTemplate}
                     resource={template}
-                    selected={template.uriTemplate === selectedTemplate}
+                    selected={template.uriTemplate === selectedTemplateUri}
                     onClick={() => {
-                      if (template.uriTemplate !== selectedTemplate)
+                      if (template.uriTemplate !== selectedTemplateUri)
                         onSelectTemplate(template.uriTemplate);
                     }}
                   />

clients/web/src/components/groups/ResourcePreviewPanel/ResourcePreviewPanel.tsx

@@ -30,7 +30,13 @@ function toContentBlock(
   if (mimeType.startsWith("image/")) {
     return { type: "image", data: item.blob, mimeType };
   }
-  return { type: "text", text: item.blob };
+  if (mimeType.startsWith("audio/")) {
+    return { type: "audio", data: item.blob, mimeType };
+  }
+  return {
+    type: "text",
+    text: `[Binary content (${mimeType}) — preview not supported]`,
+  };
 }
 
 function formatLastUpdated(date: Date): string {
@@ -113,7 +119,7 @@ export function ResourcePreviewPanel({
         ) : (
           <Spacer />
         )}
-        <MimeText>{mimeType}</MimeText>
+        {contents.length <= 1 && <MimeText>{mimeType}</MimeText>}
       </MetaRow>
       <FooterRow>
         <AnnotationGroup>

clients/web/src/components/screens/ResourcesScreen/ResourcesScreen.tsx

@@ -96,6 +96,14 @@ export function ResourcesScreen({
     ? templates.find((t) => t.uriTemplate === selectedTemplateUri)
     : undefined;
 
+  // For template-expanded URIs that don't appear in the resources list,
+  // construct a synthetic Resource so the preview panel can render.
+  const readResource: Resource | undefined =
+    selectedResource ??
+    (readState?.uri && readState.uri === selectedResourceUri
+      ? { name: readState.uri, uri: readState.uri }
+      : undefined);
+
   function renderReadState() {
     if (!readState) return null;
 
@@ -120,17 +128,17 @@ export function ResourcesScreen({
       );
     }
 
-    if (readState.result && selectedResource) {
+    if (readState.result && readResource) {
       return (
         <DetailCard>
           <ResourcePreviewPanel
-            resource={selectedResource}
+            resource={readResource}
             contents={readState.result.contents}
             lastUpdated={readState.lastUpdated}
             isSubscribed={readState.isSubscribed ?? false}
-            onRefresh={() => onReadResource(selectedResource.uri)}
+            onRefresh={() => onReadResource(readResource.uri)}
-            onSubscribe={() => onSubscribeResource(selectedResource.uri)}
+            onSubscribe={() => onSubscribeResource(readResource.uri)}
-            onUnsubscribe={() => onUnsubscribeResource(selectedResource.uri)}
+            onUnsubscribe={() => onUnsubscribeResource(readResource.uri)}
           />
         </DetailCard>
       );
@@ -148,7 +156,7 @@ export function ResourcesScreen({
             templates={templates}
             subscriptions={subscriptions}
             selectedUri={selectedResourceUri}
-            selectedTemplate={selectedTemplateUri}
+            selectedTemplateUri={selectedTemplateUri}
             listChanged={listChanged}
             onRefreshList={onRefreshList}
             onSelectUri={onSelectUri}