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Less measuring when leaving chat start

The chat view avoids a repeated height measurement around an empty message box when sending or opening a conversation.

User impact: Targeted change

For chat users: less repeated measurement around an empty message box during send/open transitions. All messages stay rendered. No action needed.

The handover from the start screen to a conversation does slightly less browser work. An empty message box now uses its normal height without an extra measurement and height adjustment. Multiline drafts still grow as before.

From chat start to the conversationEmpty message boxConversationUse the normal CSS heightAll messages stay available
The empty box needs less measuring; the full conversation stays rendered.

In five alternating production-build pairs on the same test machine, the median send transition changed from 264.0 to 228.9 ms and opening a chat from 1580.3 to 1531.4 ms. These are small, variable results from a CPU-throttled browser with software graphics, not a promise for every device or AI provider.

All messages remain rendered and available to accessibility tools. Appearance, motion settings, focus and scrolling stay the same. No action is needed.

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