Resolves#272
Changes made:
- Modified the modifier chain in `AssistantBubble` inside `ChatBubble.kt`.
- Applied `animateContentSize()` conditionally via `let { if (!message.isStreaming) it.animateContentSize() else it }`.
Reason:
- Unconditionally using `animateContentSize()` on a streaming chat bubble caused Jetpack Compose to trigger a layout animation for every single token appended. This wasted GPU cycles and contributed to streaming jank.
Impact:
- Eliminates performance issues (PERF-04) during active message streaming in the chat screen. The layout animation will now only occur once when the final (non-streaming) message state is reached. No regressions expected as this modifier change applies exclusively to the `isStreaming` state toggle.
M57
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