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fe80b4d3e4
Cancel the full thumbnail upload/render stream on page or workspace teardown and on matching thumbnail clearing. Deferred library thumbnails can otherwise query a main missing from the next WASM scene and abort the renderer (F112). Complete the upload observable after its callback so successful requests also release their subscriptions. Add async regressions for pending current and library frames, late upload callbacks, clearing, and successful rendering. They fail before the fix. Document the thumbnail lifecycle in the frontend memory. Frontend CI passes lint, 1499 tests / 7272 assertions, and formatting. Live WASM update-main followed by navigation no longer crashes; an uninterrupted library request refreshes its PNG thumbnail too. AI-assisted-by: GPT-6