1ba30028b5
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>