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/PlatformNotifications/Details.cshtml

@@ -23,7 +23,7 @@
                 <div class="card-body">
                     <dl class="row small mb-0">
                         <dt class="col-5 text-muted">Company</dt>
-                        <dd class="col-7">@(ViewBag.CompanyName ?? (Model.CompanyId > 0 ? $"#{Model.CompanyId}" : "—"))</dd>
+                        <dd class="col-7">@(ViewBag.CompanyName ?? (Model.CompanyId > 0 ? $"#{Model.CompanyId}" : "&mdash;"))</dd>
                         <dt class="col-5 text-muted">Type</dt>
                         <dd class="col-7">@Model.NotificationType</dd>
                         <dt class="col-5 text-muted">Channel</dt>