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/Unsubscribe/EmailConfirm.cshtml

@@ -1,6 +1,6 @@
 @{
     ViewData["Title"] = "Email Preferences Updated";
-    Layout = null; // Standalone page — no sidebar, no nav
+    Layout = null; // Standalone page — no sidebar, no nav
     var alreadyDone = (bool)(ViewBag.AlreadyUnsubscribed ?? false);
     var name = (string?)ViewBag.CustomerName;
 }