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.Infrastructure/Services/StripeConnectService.cs

@@ -162,7 +162,6 @@ public class StripeConnectService : IStripeConnectService
         decimal invoiceTotal,
         decimal surchargeAmount,
         string currency,
-        string customerEmail,
         string invoiceNumber,
         int invoiceId)
     {
@@ -175,7 +174,6 @@ public class StripeConnectService : IStripeConnectService
             {
                 Amount = amountInCents,
                 Currency = currency.ToLower(),
-                ReceiptEmail = customerEmail,
                 Description = $"Invoice {invoiceNumber}",
                 Metadata = new Dictionary<string, string>
                 {
@@ -215,7 +213,6 @@ public class StripeConnectService : IStripeConnectService
         decimal depositAmount,
         decimal surchargeAmount,
         string currency,
-        string customerEmail,
         string quoteNumber,
         int quoteId)
     {
@@ -228,7 +225,6 @@ public class StripeConnectService : IStripeConnectService
             {
                 Amount = amountInCents,
                 Currency = currency.ToLower(),
-                ReceiptEmail = customerEmail,
                 Description = $"Deposit for quote {quoteNumber}",
                 Metadata = new Dictionary<string, string>
                 {