feat: surface missed fonts from workers and sync session bookkeeping - #60
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…in sync Report fontNotFound from findAndReplaceFont and forward worker misses to the main thread so hosts can drive missing-font UI, while replaceMissedFonts adopts the intersection of worker-filtered maps to avoid stale entries in worker-only mode.
mlightcad
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Summary
fontNotFoundfromfindAndReplaceFont(including mapped replacements) so hosts can show missing-font UI, and forward workerfontNotFound/ clear onfontLoadedto the main-threadFontManager.replaceMissedFonts/clearMissedFontsacrossFontManager,WebWorkerRenderer, andUnifiedRenderer; worker-mode adopts the intersection of worker-filtered maps so already-loaded faces do not linger as false misses.Test plan
vitest runforfontManager,lazyFontLoading, andrender-remote-font-loadingtestsfontNotFoundfires once, then clears after lazy loadreplaceMissedFonts/clearMissedFontswith a worker pool and confirm mainmissedFontsmatches worker-filtered state