Inline item editing on details pages; fix Stripe receipt_email

Allow description, quantity, and price to be edited inline on Quote,
Job, and Invoice details pages without re-opening the wizard. Coating
and prep service rows remain read-only by design. Invoice editing is
gated to Draft/Sent/Overdue statuses; totals update live in the DOM.

Remove receipt_email from Stripe PaymentIntent creation so customers
can use any email they choose at checkout — Stripe validates format
and sends the receipt to whatever the customer enters in the Payment
Element, eliminating the risk of a stored email mismatch blocking a
payment from processing.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/PowderCoating.Application/Interfaces/IStripeConnectService.cs

@@ -20,7 +20,6 @@ public interface IStripeConnectService
         decimal invoiceTotal,
         decimal surchargeAmount,
         string currency,
-        string customerEmail,
         string invoiceNumber,
         int invoiceId);
 
@@ -33,7 +32,6 @@ public interface IStripeConnectService
         decimal depositAmount,
         decimal surchargeAmount,
         string currency,
-        string customerEmail,
         string quoteNumber,
         int quoteId);
 }