fix: permission panel scrolls the dialog box not the bottom container

[ShekharDhangar]

Fixes #2289

Summary

• Moves max-h-[50vh] overflow-y-auto from the outer SessionView wrapper to the ActionSelector box itself, so the scroll appears on the bordered dialog box rather than the app's bottom panel
• Removes the now-redundant inner max-h-[30vh] overflow-auto wrappers from ExecutePermission and McpPermission to avoid double scrollbars
• Removes the broken max-h-1/2 min-h-0 from SessionView — max-h-1/2 (percentage) doesn't resolve in a flex container without a definite parent height, so it never actually constrained anything

Demo

posthog_code.mp4

Test plan

• Trigger a permission dialog with a long command (e.g. ask Codex to write a file with large content)
• Verify the scroll appears on the bordered dialog box, not the bottom bar
• Verify buttons (Yes, proceed etc.) are reachable by scrolling within the dialog
• Trigger an MCP tool permission with large JSON input and verify the same behaviour

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Created with PostHog Code

[greptile-apps]

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