perf(desktop): use useDeferredValue in Markdown#2953
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…long renders The Markdown component parses and renders the full text synchronously via react-markdown. For very long assistant responses (e.g. a multi-page code explanation with tables and math), this can block the main thread for 50-100ms during the final markdown pass after streaming completes. Wrap the text input in useDeferredValue so React can: 1. Prioritise the plain-text streaming frame (which is already fast) 2. Abort an in-progress markdown render if a new delta arrives 3. Yield to high-priority updates (scroll, input) during the parse This is especially effective for the transition from streaming (plain text) to complete (markdown): the deferred value lets React start the markdown parse in the background while keeping the cursor and scroll responsive.
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Wrap Markdown text in
useDeferredValueso React prioritises input/scroll over expensive markdown parse during the streaming→complete transition.