Décision Panel isn't scrollable on Mac OS --> the lowest choose button is not reachable when decisions text description is long

[tjoignant]

[pbean]

Fixed by #280 — the decision, escalation, confirm, sweep-options and story-checkpoint TUI dialogs now scroll their bodies (the repo's docked-buttons pattern), so the choose/skip (and Resolve/Re-arm/close) buttons stay reachable with long content on any terminal size. Ready for review.