Fix command center permission prompt + layout picker in narrow windows

[posthog]

Summary

Reported by Sarah Sanders: in a 1x2 command-center layout, when the window is narrow / not fullscreen, the permission prompt buttons (Next / Submit) become unreachable because they fall below the cell's overflow-hidden boundary. Sarah also flagged "scrolling weirdness" when picking a different layout from the layout selector.

What changed

SessionView.tsx — the permission box at the bottom of a session pane previously had no height constraint and no scroll, so when its content was taller than the cell it just spilled out and got clipped. It now:

• Caps at max-h-1/2 of the cell height with overflow-y-auto, so the user can scroll to reach the buttons when the cell is short.
• In compact mode (used for command-center cells), drops the mx-auto + 750px maxWidth to mirror PromptInput's behavior, so it fills the narrow cell edge-to-edge.

CommandCenterToolbar.tsx — the layout Select.Content was using Radix's default position="item-aligned", which tries to keep the currently-selected option aligned with the trigger and shifts the popover up/down depending on which preset is selected. Switching to position="popper" gives a stable, predictable below-trigger placement.

Test plan

• Resize the window narrow enough that a 1x2 command-center cell is short, drop a task into a cell, trigger a permission prompt (e.g. plan mode "Next" step), and confirm Next / Submit / Cancel are reachable (visible or scrollable to).
• Confirm the permission box now scrolls internally instead of overflowing the cell.
• Open the layout selector with 1x2 selected, then with 3x3 selected — confirm the popover appears below the trigger in both cases without "jumping".
• Verify nothing changed visually for full-window task view (non-compact path still uses mx-auto p-2 + 750px max-width).

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Created with PostHog Code

[greptile-apps]

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