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/Bills/Index.cshtml

@@ -1,4 +1,4 @@
-@model List<PowderCoating.Application.DTOs.Accounting.BillExpenseListDto>
+@model List<PowderCoating.Application.DTOs.Accounting.BillExpenseListDto>
 
 @{
     ViewData["Title"] = "Bills / Expenses";
@@ -156,13 +156,13 @@
                                 }
                                 else if (entry.EntryType == "Expense")
                                 {
-                                    <span class=”text-muted”>&mdash;</span>
+                                    <span class="text-muted">&mdash;</span>
                                 }
                             </td>
                             <td><span class="badge bg-@entry.StatusColor">@entry.StatusLabel</span></td>
                             <td class="text-end">@entry.Total.ToString("C")</td>
                             <td class="text-end fw-medium @(entry.BalanceDue > 0 ? "text-danger" : "text-muted")">
-                                @(entry.EntryType == “Bill” ? entry.BalanceDue.ToString(“C”) : “&mdash;”)
+                                @(entry.EntryType == "Bill" ? entry.BalanceDue.ToString("C") : "&mdash;")
                             </td>
                             <td>
                                 @if (entry.EntryType == "Bill")