drop-deck: mobile viewport polish + manual phone QA (HITL — manual test required)

[DanielBonaker]

Parent

• Drop Deck (Game 001) — implementation PRD #12 (Drop Deck PRD)

What to build

Final polish for mobile: viewport meta, CSS for 375×667 portrait, 44×44 hit-target audit, no-rotation-gesture verification, no scroll-conflict with system gestures.

This is HITL because acceptance requires manual testing on a real phone — automated tests can't fully verify mobile interaction behavior.

Acceptance criteria

• Viewport meta tag set correctly
• CSS layout works at 375×667 viewport
• All interactive elements ≥44×44 (audit; document in PR)
• No board-level rotation gestures registered (verified by code review and manual test)
• No scroll-conflict with system swipe gestures (manual test)
• Drag works with touch (not just mouse)
• Manual phone QA: human runs game on actual phone before close — drags one round, tops out, retries, verifies no UI glitches

Blocked by

• drop-deck: round system + InRound→InShop transition #24, drop-deck: booster shop slot (Small/Medium/Large) #25, drop-deck: shop completion (remove/skip/passive slots) #26, drop-deck: hold-swap with 44×44 button #28 (most UI surface must exist to audit)

HITL note

Implementation is AFK — CSS, audit, automated verification can be done by night-shift. Acceptance criteria includes a manual phone test that requires a human + an actual phone before merging.