Added a per-player “Placement Mode” for the Dimensional Pocket: right-click a block icon in the pocket GUI to select it, then right-click a block in the world while holding the pocket to place that block.

Each placement consumes 1 from the pocket’s stored count for that material (storage is clamped so it won’t go negative).
Easy “turn it off”: right-click the same icon again in the GUI, or shift-right-click while holding the pocket.

Opening the pocket GUI always resets back to normal mode (no placement mode selected)