Material Item Visibility, Purchasing Filters + Xero Invoice Improvements

• Material item movement summaries: material item screens now include a dedicated movement summary, making it easier to review recent stock activity without leaving the item context.
• Purchase history tooltips: purchase truck icons now expose purchase order details on hover, so users can quickly see the related purchase information behind an item status.
• Delivered purchase status visibility: material item purchase history now shows delivered truck status, giving users a clearer signal when purchased stock has been received.
• Per-location reorder and maximum levels: material views now show reorder and max stock thresholds by location, with blank reorder levels treated as zero for clearer low-stock logic.
• Sales list filtering: users can hide void and invoiced sales from the sales list, helping teams focus on sales that still need action.
• Purchase order filtering: purchase order history can be filtered to focus on non-completed items, reducing noise when reviewing open purchasing work.
• Customer address handling on sales: when switching customers on a sale, users are prompted to choose whether to keep the existing address details or replace them with the new customer's details.
• Xero invoice email handling: invoice emailing through Xero has been cleaned up to reduce inconsistent behaviour.
• Xero discount handling: discounts are handled more cleanly in Xero invoices, including fixes for discounts appearing as separate line items and tax not being deducted correctly after discounts.
• Invoice PDF defaults: invoice PDF generation now defaults more reliably to the Xero invoice PDF where appropriate.
• Stock warnings: stock warning logic now catches zero-stock items with open sales, improving the accuracy of inventory warnings.

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