Issue #3611898: Add a Remove all button to the graphical seat map's selection panel

Frank Mablyrequested to merge
issue/yoyaku-3611898:3611898-add-a-remove into 1.x

Adds a Remove all button to the graphical seat map's "Your selection" panel.

Problem

The panel lets a visitor release seats one at a time with the per-seat remove (×) button, but there is no way to clear the whole selection in one action.

Change

  • A clear operation on the seat-op endpoint (SeatSelectionController::act) releases every seat the session holds for the slot in a single pass, through the same booking engine and slot lock as the per-seat release.
  • The panel shows a full-width Remove all button below the total, only when at least one seat is held; clicking it posts clear, resets the held seats to available on the map and empties the panel.
  • New JS strings go through Drupal.t(); the button is styled with the existing panel tokens (theme-aware).

Follow-up to the graphical seat map (#3611792).

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