v0.3.1

Fixes the silent full-page reload when clicking + on a quantity already at its per-order cap (Blocksy cart auto-update submits the cart form on any change event, even a no-op one). At-cap + clicks are now intercepted before the theme sees them and flash the "Maximum N per order." note — in the mini-cart drawer a temporary inline warning is shown instead. Typed values clamped back to the current cart quantity no longer trigger a pointless cart update either.