Ad-hoc quote email, accounting improvements, AI lookup fix, and misc service updates

- Quotes: ad-hoc email modal on Quote Details lets staff send to an address not on file;
  QuotesController passes overrideEmail through to NotificationService
- Quotes/Details view: SMS consent display, email/SMS send button state based on consent
- Accounting module: AccountingDisplayHelpers for consistent ledger formatting;
  AccountsController + Accounts views improvements; AccountingEnums additions
- Bills/Expenses: AI account categorization fixes in BillsController and ExpensesController
- InventoryAiLookupService: TDS cure fallback no longer fires on AiAugmentFromUrl path
  (LookupByUrlAsync already has it built in — was double-fetching)
- PdfService: quote/invoice PDF updates
- PricingCalculationService: minor pricing logic fix
- QuoteProfile: mapping updates for new quote fields
- ApplicationDbContextModelSnapshot: catches up to all 4 migrations in this branch

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

src/PowderCoating.Web/Controllers/BillsController.cs

@@ -424,7 +424,8 @@ public class BillsController : Controller
 
         // Payment form defaults
         var bankAccounts = (await _unitOfWork.Accounts.FindAsync(
-            a => a.AccountSubType == AccountSubType.Checking ||
+            a => a.AccountSubType == AccountSubType.Cash ||
+                 a.AccountSubType == AccountSubType.Checking ||
                  a.AccountSubType == AccountSubType.Savings ||
                  a.AccountSubType == AccountSubType.CreditCard))
             .OrderBy(a => a.AccountNumber)
@@ -949,7 +950,8 @@ public class BillsController : Controller
             .ToList();
 
         ViewBag.BankAccounts = allAccounts
-            .Where(a => a.AccountSubType == AccountSubType.Checking ||
+            .Where(a => a.AccountSubType == AccountSubType.Cash ||
+                        a.AccountSubType == AccountSubType.Checking ||
                         a.AccountSubType == AccountSubType.Savings ||
                         a.AccountSubType == AccountSubType.CreditCard)
             .OrderBy(a => a.AccountNumber)