Add FPS-adaptive "ultra performance" + gate model load on WebGPU adapter

Update summarize.js

Update summarize.js

Update summarize.js

Update summarize.js

Update summarize.js

Update summarize.js

Update summarize.js

Stream summary text live instead of revealing it all at once

Rescope summaries to one button per H1/H2 section

Add on-device AI summaries for article content blocks