Sweep all .cshtml files for encoding corruption; add pre-commit guard

Replace all corruption variants with HTML entities across 226 view files:
- 3-char UTF-8-as-Win1252 sequences (ae-corruption)
- Standalone smart/curly quotes that break C# Razor expressions
- Partially re-corrupted variants where the 3rd byte was normalised to ASCII

tools/Fix-Encoding.ps1: re-runnable sweep; uses [char] code points so the
script itself never contains a literal non-ASCII character; supports -DryRun

.githooks/pre-commit: blocks commits containing the ae-corruption byte
signature (xc3xa2xe2x82xac); git core.hooksPath = .githooks so the
hook is repo-committed and active for all future work on this machine.

Build clean; 225 unit tests pass.

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

src/PowderCoating.Web/Views/Payment/Index.cshtml

@@ -1,4 +1,4 @@
-@model PowderCoating.Web.Controllers.PaymentPageViewModel
+@model PowderCoating.Web.Controllers.PaymentPageViewModel
 @using PowderCoating.Core.Enums
 
 @{
@@ -141,7 +141,7 @@
     }
 
     // Back-calculates the base invoice amount from a total that includes the fee.
-    // Server receives the base and adds surcharge on top — both paths arrive at the same
+    // Server receives the base and adds surcharge on top — both paths arrive at the same
     // PaymentIntent amount so Stripe.js never sees an amount mismatch.
     function calcBaseFromTotal(total) {
         if (SURCHARGE_TYPE === 'Percent')
@@ -208,7 +208,7 @@
             return;
         }
 
-        // Create PaymentIntent on server — send base amount (server adds surcharge)
+        // Create PaymentIntent on server — send base amount (server adds surcharge)
         let clientSecret;
         try {
             const resp = await fetch(`/pay/${TOKEN}/intent`, {

src/PowderCoating.Web/Views/Payment/Success.cshtml

@@ -9,7 +9,7 @@
         <i class="bi bi-check-circle-fill text-success" style="font-size:3.5rem;"></i>
         <h4 class="mt-3 fw-bold">Payment Received!</h4>
         <p class="text-muted mb-0">
-            Thank you — your payment has been processed successfully.
+            Thank you &mdash; your payment has been processed successfully.
             You'll receive a confirmation once your payment is verified by the shop.
         </p>
         <hr class="my-3" />