Polish the manual invoice feature with 4 improvements:
1. Admin invoice form: numeric fields (unit_price, discount_amount) now
display values with thousand-separators (e.g. 1,000,000 instead of
1000000) via formatStateUsing/dehydrateStateUsing for easier reading
of large Rial amounts. The placeholder/subtotal/total calculations
also strip commas before arithmetic.
2. Fix 'total amount payable = 0' bug in the form. The placeholder
had a typo: 'foreach ( as )' overwrote the loop variable
and made the inner calculation use the array instead of each item,
so the sum was always 0. Now correctly iterates with .
3. Customer dashboard widget: add an 'Invoices pending payment' card
showing the count, with a link to /my-account/?tab=invoices if > 0.
Relabel the existing 'Pending payment' card to 'Pending payment
(orders)' to clarify it's for orders, not invoices.
4. Customer profile financial status: include manual invoices in the
accounting_balance and pending_payments_total. Show a breakdown
list (orders vs invoices) under the balance card, plus two new stat
cards (pending invoices count/total, paid invoices count/total)
with a link to the invoices tab.
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