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* perf(mothership): restore static markdown parse for settled chat messages Settled/reloaded chat messages rendered through Streamdown's streaming parser (remend + incomplete-markdown repair + per-block re-parse, running the rehype raw/sanitize/harden chain once per block). Because rows are virtualized, every up/down scroll remounted the messages crossing the overscan boundary and re-paid that N-block cost — the scroll lag. - Render never-streamed mounts (reloaded history, or an in-session message scrolled out of the virtualized window and back) with mode='static': one whole-document parse instead of streaming's per-block re-parse. In-session streaming keeps the streaming parser for its mount life (no drain flash). - Cache Prism highlight output in a module-level bounded LRU so a code block re-highlights at most once across the unmount/remount virtualization does on scroll (a component useMemo would not survive the unmount). * fix(mothership): don't cache fallback-highlighted code blocks An unregistered language highlighted via the JavaScript fallback was cached under its own name, so if that Prism grammar registered later in the session a remount would keep serving the stale fallback render. Resolve the grammar inside the highlight helper and skip the cache entirely on the fallback path.