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/CatalogItems/Index.cshtml

@@ -3,7 +3,7 @@
     ViewData["Title"] = "Product Catalog";
     ViewData["PageIcon"] = "bi-book";
     ViewData["PageHelpTitle"] = "Product Catalog";
-    ViewData["PageHelpContent"] = "The Product Catalog is a library of standard items (wheels, brackets, panels, etc.) that your shop regularly quotes and invoices. Each item has a fixed price — when a catalog item is added to a quote or job, that price is used exactly as entered. No markup, no prep services, and no complexity charges are added on top. Organize items into categories to keep the catalog easy to browse.";
+    ViewData["PageHelpContent"] = "The Product Catalog is a library of standard items (wheels, brackets, panels, etc.) that your shop regularly quotes and invoices. Each item has a fixed price — when a catalog item is added to a quote or job, that price is used exactly as entered. No markup, no prep services, and no complexity charges are added on top. Organize items into categories to keep the catalog easy to browse.";
     var totalItemsCount = ViewBag.TotalItemsCount ?? 0;
     var activeItemsCount = ViewBag.ActiveItemsCount ?? 0;
     var averagePrice = ViewBag.AveragePrice ?? 0m;