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/map-server/server.ts

@@ -21,6 +21,7 @@ import {
   RESOURCE_URI_META_KEY,
 } from "@modelcontextprotocol/ext-apps/server";
 import { startServer } from "./server-utils.js";
+import { randomUUID } from "crypto";
 
 const DIST_DIR = path.join(import.meta.dirname, "dist");
 const RESOURCE_URI = "ui://cesium-map/mcp-app.html";
@@ -182,6 +183,9 @@ export function createServer(): McpServer {
           text: `Displaying globe at: W:${west.toFixed(4)}, S:${south.toFixed(4)}, E:${east.toFixed(4)}, N:${north.toFixed(4)}${label ? ` (${label})` : ""}`,
         },
       ],
+      _meta: {
+        widgetUUID: randomUUID(),
+      },
     }),
   );