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/Appointments/Details.cshtml

@@ -1,10 +1,10 @@
-@model PowderCoating.Application.DTOs.Appointment.AppointmentDto
+@model PowderCoating.Application.DTOs.Appointment.AppointmentDto
 
 @{
     ViewData["Title"] = $"Appointment {Model.AppointmentNumber}";
     ViewData["PageIcon"] = "bi-calendar-event";
     ViewData["PageHelpTitle"] = "Appointment Details";
-    ViewData["PageHelpContent"] = "View all details for this appointment. Edit to update status or record actual times. Deleting permanently removes the record — consider setting status to Cancelled instead to preserve history.";
+    ViewData["PageHelpContent"] = "View all details for this appointment. Edit to update status or record actual times. Deleting permanently removes the record — consider setting status to Cancelled instead to preserve history.";
 }
 
 <div class="d-flex justify-content-end gap-2 mb-4">