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/Edit.cshtml

@@ -115,7 +115,7 @@
                                 <a tabindex="0" class="help-icon" role="button"
                                    data-bs-toggle="popover" data-bs-placement="right" data-bs-trigger="focus"
                                    data-bs-title="Actual Times"
-                                   data-bs-content="Record when the customer actually arrived and when the appointment finished. These are optional and separate from the scheduled times — useful for tracking punctuality and measuring how accurately appointments are estimated.">
+                                   data-bs-content="Record when the customer actually arrived and when the appointment finished. These are optional and separate from the scheduled times &mdash; useful for tracking punctuality and measuring how accurately appointments are estimated.">
                                     <i class="bi bi-question-circle"></i>
                                 </a>
                             </div>
@@ -169,7 +169,7 @@
                                 <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>