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/CreditMemos/Create.cshtml

@@ -33,7 +33,7 @@
                     <div class="mb-3">
                         <label asp-for="CustomerId" class="form-label">Customer <span class="text-danger">*</span></label>
                         <select asp-for="CustomerId" asp-items="customers" class="form-select">
-                            <option value="0">— select customer —</option>
+                            <option value="0">&mdash; select customer &mdash;</option>
                         </select>
                         <span asp-validation-for="CustomerId" class="text-danger small"></span>
                     </div>
@@ -51,7 +51,7 @@
                     <div class="mb-3">
                         <label asp-for="Reason" class="form-label">Reason <span class="text-danger">*</span></label>
                         <input asp-for="Reason" class="form-control"
-                               placeholder="e.g. Price adjustment, billing error, goodwill credit…" />
+                               placeholder="e.g. Price adjustment, billing error, goodwill credit&hellip;" />
                         <span asp-validation-for="Reason" class="text-danger small"></span>
                     </div>
 
@@ -65,7 +65,7 @@
                     <div class="mb-4">
                         <label asp-for="ExpiryDate" class="form-label">
                             Expiry Date
-                            <span class="text-muted small ms-1">(optional — leave blank for no expiry)</span>
+                            <span class="text-muted small ms-1">(optional &mdash; leave blank for no expiry)</span>
                         </label>
                         <input asp-for="ExpiryDate" type="date" class="form-control" />
                         <span asp-validation-for="ExpiryDate" class="text-danger small"></span>