fix(examples): improve updateModelContext with structured YAML frontmatter (#271)

* map-server: fix async/await in ontoolresult, remove unused getViewStorageKey

* fix(map-server): improve updateModelContext and fix initialization

- Use structured YAML frontmatter format for model context (like pdf-server)
- Add tool name, altitude, and cleaner data format
- Fix initialization deadlock: app.connect() was inside ontoolresult handler
  which could never fire until connected
- Fix view state persistence: widgetUUID now properly extracted from
  ontoolresult and used to restore persisted camera position
- Server now includes widgetUUID in tool result _meta for widget identification

* fix(pdf-server): use widgetUUID for page persistence

- Add widgetUUID to tool result _meta for widget identification
- Use widgetUUID instead of generated key (pdfUrl+toolId) for localStorage
- Enables reliable page restoration when revisiting PDF widgets

* fix(transcript-server): use structured YAML frontmatter for model context

- Add tool name, listening status, and unsent entry count in frontmatter
- Consistent format with pdf-server and map-server

* update names

* drop bogus altitude

* Update mcp-app.ts

examples/transcript-server/src/mcp-app.ts

@@ -329,18 +329,31 @@ function updateSendButton() {
   sendBtn.disabled = unsentEntries.length === 0;
 }
 
+/**
+ * Update model context with structured YAML frontmatter (like pdf-server, map-server).
+ */
 function updateModelContext() {
   const caps = app.getHostCapabilities();
   if (!caps?.updateModelContext) return;
 
   const text = getUnsentText();
+  const unsentCount = getUnsentEntries().length;
   log.info("Updating model context:", text || "(empty)");
 
+  // Build structured markdown with YAML frontmatter
+  const frontmatter = [
+    "---",
+    "tool: transcribe",
+    `status: ${isListening ? "listening" : "paused"}`,
+    `unsent-entries: ${unsentCount}`,
+    "---",
+  ].join("\n");
+
+  const markdown = text ? `${frontmatter}\n\n${text}` : frontmatter;
+
   app
     .updateModelContext({
-      content: text
-        ? [{ type: "text", text: `[Live transcript]: ${text}` }]
-        : [],
+      content: [{ type: "text", text: markdown }],
     })
     .catch((e: unknown) => {
       log.warn("Failed to update model context:", e);