feat: throttle countdown in decision strip (#163)

[jrhubott]

Summary

When the integration's "Minimum interval between position changes" throttle is currently postponing a cover move, the decision strip now shows a live "Next adjustment allowed in {time}" countdown banner (mdi:timer-sand). It renders only while a move is actually blocked (last_skipped_action = time_delta_too_small) and hides once the interval elapses. No integration change was needed — the card already bound the last_skipped_action sensor but never read it. The banner appears in both the root card and the more-info dialog.

Testing

• ✅ 917 tests passing (910 baseline + 4 formatter + 3 decision-strip render)
• ✅ tsc clean, lint clean, dist/ rebuilt
• ✅ Harness updated: throttle-pending flag + controls, mock state-gen emission, mock i18n mirror, and a "Throttled — waiting on interval" scenario

Related Issues

Refs #163