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/Customers/Details.cshtml

@@ -1,4 +1,4 @@
-@model PowderCoating.Application.DTOs.Customer.CustomerDto
+@model PowderCoating.Application.DTOs.Customer.CustomerDto
 
 @{
     ViewData["Title"] = !string.IsNullOrWhiteSpace(Model.CompanyName)
@@ -123,7 +123,7 @@
                                     }
                                     else
                                     {
-                                        <span class=”text-muted”>Not set &mdash; invoices go to contact email</span>
+                                        <span class="text-muted">Not set &mdash; invoices go to contact email</span>
                                     }
                                 </p>
                             </div>
@@ -531,7 +531,7 @@
                         <div class="mb-3">
                             <label class="form-label fw-semibold">Reason <span class="text-danger">*</span></label>
                             <select name="Reason" class="form-select" required id="creditReasonSelect">
-                                <option value="">— Select reason —</option>
+                                <option value="">&mdash; Select reason &mdash;</option>
                                 <option value="Pre-payment / Deposit">Pre-payment / Deposit</option>
                                 <option value="Gift / Gift Card">Gift / Gift Card</option>
                                 <option value="Overpayment credit">Overpayment credit</option>