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* improvement(ui): delegate streaming animation to Streamdown component Remove custom useStreamingText hook and useThrottledValue indirection in favor of Streamdown's built-in streaming props. This eliminates the manual character-by-character reveal logic (setInterval, easing, chase factor) and lets the library handle animation natively, reducing complexity and improving consistency across Mothership and chat. * improvement(ui): inline passthrough wrapper, add hydration guard - Inline EnhancedMarkdownRenderer which became a trivial passthrough after removing useThrottledValue - Add hydration guard to MarkdownRenderer to prevent replaying the entrance animation when mounting mid-stream with existing content * improvement: removed chat animation * improvement(ui): remove hardcoded fade-in animations from special tags Remove animate-stream-fade-in from OptionsDisplay, CredentialDisplay, MothershipErrorDisplay, and UsageUpgradeDisplay. These components re-render after streaming ends, causing a visible flash as the opacity animation replays. PendingTagIndicator retains its animation since it only renders during active streaming. * fix(ui): use streaming mode for Streamdown during active streams mode='static' disables Remend (auto-closing incomplete markdown), incremental block splitting, and React Transitions. Switch to streaming mode while isStreaming is true so partial markdown renders correctly, without re-adding animation props.