Tapping an empty booster opens the get-one dialog; confirming watches a
rewarded ad and, on earn, grants +1 of that booster and logs booster_granted
(source: ad). Covered by a widget test using an uninitialized AdService whose
showRewarded() resolves true.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Mount BoosterBar below the tray (only while playing), guarded so legacy
GameScreen tests without a SaveRepository keep passing. Tapping a booster
arms targeting: shuffle applies immediately; hammer/line-bomb arm a board
tap (hammer clears a cell, line-bomb opens a row/column chooser). An empty
booster opens a get-one dialog (ad grant lands in Task 15).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
airkjw