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/TwoFactorSetup/Setup.cshtml

@@ -1,4 +1,4 @@
-@{
+@{
     ViewData["Title"] = "Set Up Two-Factor Authentication";
 }
 
@@ -15,7 +15,7 @@
         <div class="card-body">
             <ol class="mb-0 ps-3">
                 <li class="mb-3">
-                    <strong>Install an authenticator app</strong> on your phone if you haven't already —
+                    <strong>Install an authenticator app</strong> on your phone if you haven't already &mdash;
                     <em>Google Authenticator</em>, <em>Microsoft Authenticator</em>, or <em>Authy</em> all work.
                 </li>
                 <li class="mb-3">