fix(command-center): question prompt no longer blocks thread scroll

[digvijay208]

Summary

Fixes #2510.

When a question/permission prompt appeared in a Command Center cell, the ComposerSlot wrapper had shrink-0, preventing the flex layout from yielding space to the ThreadView above. Combined with ActionSelector's max-h-[80vh] (80% of the viewport, not the cell), the question card could consume the entire visible area in a compact command-center cell, making it impossible to scroll up to read past messages.

Root cause

Flex column (height: 100% of cell)
|-- ThreadView   -> min-h-0 flex-1 (scrollable)  <- got crushed to 0
`-- ComposerSlot -> shrink-0 [x] + ActionSelector max-h-[80vh] [x]

Changes

packages/ui/src/features/sessions/components/SessionView.tsx

In ComposerSlot, drop shrink-0 and add max-h-[50%] in compact mode so the question card never consumes more than half the cell height. The thread above remains scrollable. Non-compact (full task view) behavior is unchanged.

Testing

• Open the Command Center with a task that triggers a question prompt (multi-step question tool call)
• • Confirm the conversation thread is still visible and scrollable above the question card
• • Confirm the question card itself scrolls if content is taller than 50% of the cell
• • Confirm full task view (non-compact) works exactly as before

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