Product customisation

Product customisation options; flash claims on/off; leaner Add/Edit product screens.

New

• Product customisation — per-product form fields (short text, select, checkbox) under Edit product → Advanced, with Require online / Require in store per field
• Custom Add to cart label — optional button text when customisation is enabled
• Enable flash claims — toggle under Settings → Pages → Flash → Claims (on by default; off makes the gallery browse-only)

Improved

• Online product page — customise-then-add flow; required online fields enforced before add to cart
• POS and quotes — optional Customise button; required in-store fields block charge/quote when incomplete
• Customisations everywhere — answers show on cart, order detail, pick slip, tax invoice and quote PDFs, and order/fulfillment/quote/refund emails
• Add product — essentials only; preorder, backorder, variations, royalty, and customisation stay on Edit → Advanced
• Edit product — Show advanced / Hide advanced for customisation, variations, siblings, preorder, backorder, and royalty (auto-opens when any are set; hidden fields still save)
• Product slug — relabelled URL and made less prominent
• Flash claims — require Contact page enabled; disabling Contact turns claims off
• Order notes — trash icon sizing fixed so delete is visible again
• Other improvements and bug fixes