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/Create.cshtml

@@ -1,10 +1,10 @@
-@model PowderCoating.Application.DTOs.Appointment.CreateAppointmentDto
+@model PowderCoating.Application.DTOs.Appointment.CreateAppointmentDto
 
 @{
     ViewData["Title"] = "New Appointment";
     ViewData["PageIcon"] = "bi-calendar-plus";
     ViewData["PageHelpTitle"] = "New Appointment";
-    ViewData["PageHelpContent"] = "Create an appointment to schedule a customer visit, drop-off, pick-up, or consultation. Select the Type first — the Linked Job field appears once a type is chosen. Reminder notifications fire before the scheduled start time.";
+    ViewData["PageHelpContent"] = "Create an appointment to schedule a customer visit, drop-off, pick-up, or consultation. Select the Type first — the Linked Job field appears once a type is chosen. Reminder notifications fire before the scheduled start time.";
 }
 
 <div class="d-flex justify-content-end align-items-center mb-4">
@@ -143,7 +143,7 @@
                                 <a tabindex="0" class="help-icon" role="button"
                                    data-bs-toggle="popover" data-bs-placement="right" data-bs-trigger="focus"
                                    data-bs-title="Reminder Settings"
-                                   data-bs-content="Enable a reminder to receive an in-app notification before the appointment. Set how many minutes in advance — e.g., 30 for a brief heads-up, 1440 for a full day before. Reminders are per-appointment and do not send external emails or SMS.">
+                                   data-bs-content="Enable a reminder to receive an in-app notification before the appointment. Set how many minutes in advance &mdash; e.g., 30 for a brief heads-up, 1440 for a full day before. Reminders are per-appointment and do not send external emails or SMS.">
                                     <i class="bi bi-question-circle"></i>
                                 </a>
                             </div>