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>
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