Morphs the DOM on content edits instead of reloading the whole page - #177
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Following forester's example, we can do more granular updates in the HTML dev server using idiomorph.
The dev server split one reload event into two. A rebuild triggered only by .typ sources now refetches the page and morphs it into the live DOM, so scroll position, focus, selection, open and media playback survive an edit. A rebuild that touched a declared asset, a copy-glob match, a font or rheo.toml still navigates, since the browser holds those bytes under an unchanged URL and a morph would never refetch them.
The watcher now reports which, and serves Idiomorph plus the client from /.rheo/live.js.