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- Request at most 25 messages from chat.history (was 200) to reduce payload size and JSON parse cost in the browser. - Cap rendered chat history at 25 messages to avoid main-thread freeze from rendering many markdown messages (fixes 'tab unresponsive'). - Defer applying messages with requestAnimationFrame so the UI can paint 'Loading chat...' before the heavy render. - Cap sessions.list to 40 when loading the chat tab to avoid large session dropdown response. Helps address #10622 (Webchat UI freezes when loading sessions with many messages). Gateway already caps payload size (#18505); this adds client-side limits so the Control UI stays responsive with long sessions. Made-with: Cursor