the orphaned-cache-file sweep ran a synchronous recursive listSync on
the UI isolate at startup against a cache that can hold 10k files; use
the async listing instead. memoize adjustChatNameColor keyed by (color,
background, target contrast) since chat repeats the same handful of
palette colors thousands of times and low-contrast ones pay a 16-step
search per call.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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