Extract shared LaunchButton component

[Mr-Godot]

Context

LaunchButton is duplicated in SessionCard.tsx (lines 15-37) and $sessionId.tsx (lines 32-57) with nearly identical logic. Only difference is padding classes.

Action

• Create components/LaunchButton.tsx with a size prop ('sm' | 'md')
• Import in both SessionCard and $sessionId, remove duplicated code

Acceptance Criteria

• Single source of truth for LaunchButton
• Works identically in both card and detail page
• No visual change

[github-actions]

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