fix: map-server screenshot now renders properly

- Merged ochafik/post-fixes which reverts sandbox from srcdoc to document.write
  (CesiumJS doesn't work with srcdoc iframes)
- Fixed map-server name in screenshot test ('Map Server' not 'CesiumJS Map Server')
- Simplified screenshot generation script (removed complex debugging code)
- Increased map-server wait time to 45s for reliable tile loading
- Regenerated all 13 screenshots

Author: ochafik

README.md

@@ -4,21 +4,21 @@
 
 ## Example Gallery
 
-| | | |
-|:---:|:---:|:---:|
-| [![Map](examples/map-server/grid-cell.png "Interactive 3D globe viewer using CesiumJS")](examples/map-server) | [![Three.js](examples/threejs-server/grid-cell.png "Interactive 3D scene renderer")](examples/threejs-server) | [![ShaderToy](examples/shadertoy-server/grid-cell.png "Real-time GLSL shader renderer")](examples/shadertoy-server) |
-| [**Map**](examples/map-server) | [**Three.js**](examples/threejs-server) | [**ShaderToy**](examples/shadertoy-server) |
-| [![Sheet Music](examples/sheet-music-server/grid-cell.png "ABC notation to sheet music")](examples/sheet-music-server) | [![Wiki Explorer](examples/wiki-explorer-server/grid-cell.png "Wikipedia link graph visualization")](examples/wiki-explorer-server) | [![Cohort Heatmap](examples/cohort-heatmap-server/grid-cell.png "Customer retention heatmap")](examples/cohort-heatmap-server) |
-| [**Sheet Music**](examples/sheet-music-server) | [**Wiki Explorer**](examples/wiki-explorer-server) | [**Cohort Heatmap**](examples/cohort-heatmap-server) |
+|                                                                                                                                     |                                                                                                                                         |                                                                                                                                                        |
+| :---------------------------------------------------------------------------------------------------------------------------------: | :-------------------------------------------------------------------------------------------------------------------------------------: | :----------------------------------------------------------------------------------------------------------------------------------------------------: |
+|            [![Map](examples/map-server/grid-cell.png "Interactive 3D globe viewer using CesiumJS")](examples/map-server)            |              [![Three.js](examples/threejs-server/grid-cell.png "Interactive 3D scene renderer")](examples/threejs-server)              |                  [![ShaderToy](examples/shadertoy-server/grid-cell.png "Real-time GLSL shader renderer")](examples/shadertoy-server)                   |
+|                                                   [**Map**](examples/map-server)                                                    |                                                 [**Three.js**](examples/threejs-server)                                                 |                                                       [**ShaderToy**](examples/shadertoy-server)                                                       |
+|       [![Sheet Music](examples/sheet-music-server/grid-cell.png "ABC notation to sheet music")](examples/sheet-music-server)        |   [![Wiki Explorer](examples/wiki-explorer-server/grid-cell.png "Wikipedia link graph visualization")](examples/wiki-explorer-server)   |             [![Cohort Heatmap](examples/cohort-heatmap-server/grid-cell.png "Customer retention heatmap")](examples/cohort-heatmap-server)             |
+|                                           [**Sheet Music**](examples/sheet-music-server)                                            |                                           [**Wiki Explorer**](examples/wiki-explorer-server)                                            |                                                  [**Cohort Heatmap**](examples/cohort-heatmap-server)                                                  |
 | [![Scenario Modeler](examples/scenario-modeler-server/grid-cell.png "SaaS business projections")](examples/scenario-modeler-server) | [![Budget Allocator](examples/budget-allocator-server/grid-cell.png "Interactive budget allocation")](examples/budget-allocator-server) | [![Customer Segmentation](examples/customer-segmentation-server/grid-cell.png "Scatter chart with clustering")](examples/customer-segmentation-server) |
-| [**Scenario Modeler**](examples/scenario-modeler-server) | [**Budget Allocator**](examples/budget-allocator-server) | [**Customer Segmentation**](examples/customer-segmentation-server) |
-| [![System Monitor](examples/system-monitor-server/grid-cell.png "Real-time OS metrics")](examples/system-monitor-server) | [![Transcript](examples/transcript-server/grid-cell.png "Live speech transcription")](examples/transcript-server) | [![Video Resource](examples/video-resource-server/grid-cell.png "Binary video via MCP resources")](examples/video-resource-server) |
-| [**System Monitor**](examples/system-monitor-server) | [**Transcript**](examples/transcript-server) | [**Video Resource**](examples/video-resource-server) |
+|                                      [**Scenario Modeler**](examples/scenario-modeler-server)                                       |                                        [**Budget Allocator**](examples/budget-allocator-server)                                         |                                           [**Customer Segmentation**](examples/customer-segmentation-server)                                           |
+|      [![System Monitor](examples/system-monitor-server/grid-cell.png "Real-time OS metrics")](examples/system-monitor-server)       |            [![Transcript](examples/transcript-server/grid-cell.png "Live speech transcription")](examples/transcript-server)            |           [![Video Resource](examples/video-resource-server/grid-cell.png "Binary video via MCP resources")](examples/video-resource-server)           |
+|                                        [**System Monitor**](examples/system-monitor-server)                                         |                                              [**Transcript**](examples/transcript-server)                                               |                                                  [**Video Resource**](examples/video-resource-server)                                                  |
 
 ### Starter Templates
 
-| | |
-|:---:|:---|
+|                                                                                                       |                                                                                                                                                                                                                                                                                                                            |
+| :---------------------------------------------------------------------------------------------------: | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | [![Basic](examples/basic-server-react/grid-cell.png "Starter template")](examples/basic-server-react) | The same app built with different frameworks — pick your favorite!<br><br>[React](examples/basic-server-react) · [Vue](examples/basic-server-vue) · [Svelte](examples/basic-server-svelte) · [Preact](examples/basic-server-preact) · [Solid](examples/basic-server-solid) · [Vanilla JS](examples/basic-server-vanillajs) |
 
 This repo contains the SDK and [specification](https://github.com/modelcontextprotocol/ext-apps/blob/main/specification/draft/apps.mdx) for MCP Apps Extension ([SEP-1865](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1865)).