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/EmailBroadcast/SelectCompanies.cshtml

@@ -75,7 +75,7 @@
                                     <div class="fw-semibold">@company.CompanyName</div>
                                     <div class="small text-muted">#@company.CompanyId</div>
                                 </td>
-                                <td>@(string.IsNullOrWhiteSpace(company.PrimaryContactName) ? "—" : company.PrimaryContactName)</td>
+                                <td>@(string.IsNullOrWhiteSpace(company.PrimaryContactName) ? "&mdash;" : company.PrimaryContactName)</td>
                                 <td>
                                     @if (string.IsNullOrWhiteSpace(company.PrimaryContactEmail))
                                     {
@@ -87,7 +87,7 @@
                                     }
                                 </td>
                                 <td>
-                                    <div>@(string.IsNullOrWhiteSpace(company.CompanyAdminName) ? "—" : company.CompanyAdminName)</div>
+                                    <div>@(string.IsNullOrWhiteSpace(company.CompanyAdminName) ? "&mdash;" : company.CompanyAdminName)</div>
                                     @if (!string.IsNullOrWhiteSpace(company.CompanyAdminEmail))
                                     {
                                         <div class="small text-muted">@company.CompanyAdminEmail</div>