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/PricingTiers/Edit.cshtml

@@ -32,7 +32,7 @@
                             <a tabindex="0" class="help-icon" role="button"
                                data-bs-toggle="popover" data-bs-placement="right"
                                data-bs-title="Tier Name"
-                               data-bs-content="Choose a name that communicates the customer relationship level — for example &lt;em&gt;Silver&lt;/em&gt;, &lt;em&gt;Gold&lt;/em&gt;, &lt;em&gt;Preferred Shop&lt;/em&gt;, or &lt;em&gt;Wholesale&lt;/em&gt;. The name is visible to your staff when editing customers and appears in the quote pricing breakdown.">
+                               data-bs-content="Choose a name that communicates the customer relationship level &mdash; for example &lt;em&gt;Silver&lt;/em&gt;, &lt;em&gt;Gold&lt;/em&gt;, &lt;em&gt;Preferred Shop&lt;/em&gt;, or &lt;em&gt;Wholesale&lt;/em&gt;. The name is visible to your staff when editing customers and appears in the quote pricing breakdown.">
                                 <i class="bi bi-question-circle"></i>
                             </a>
                             <input asp-for="TierName" class="form-control" autofocus />
@@ -41,7 +41,7 @@
 
                         <div class="mb-3">
                             <label asp-for="Description" class="form-label fw-semibold">Description</label>
-                            <input asp-for="Description" class="form-control" placeholder="Optional — shown on customer profiles" />
+                            <input asp-for="Description" class="form-control" placeholder="Optional &mdash; shown on customer profiles" />
                             <span asp-validation-for="Description" class="text-danger"></span>
                         </div>
 
@@ -50,7 +50,7 @@
                             <a tabindex="0" class="help-icon" role="button"
                                data-bs-toggle="popover" data-bs-placement="right"
                                data-bs-title="Discount Percentage"
-                               data-bs-content="This percentage is automatically deducted from the subtotal of every new quote created for a customer on this tier. &lt;strong&gt;Changing this value affects all future quotes&lt;/strong&gt; for customers on the tier — existing quotes are not recalculated. Enter &lt;strong&gt;0&lt;/strong&gt; for standard pricing with no discount.">
+                               data-bs-content="This percentage is automatically deducted from the subtotal of every new quote created for a customer on this tier. &lt;strong&gt;Changing this value affects all future quotes&lt;/strong&gt; for customers on the tier &mdash; existing quotes are not recalculated. Enter &lt;strong&gt;0&lt;/strong&gt; for standard pricing with no discount.">
                                 <i class="bi bi-question-circle"></i>
                             </a>
                             <div class="input-group" style="max-width: 200px;">
@@ -69,7 +69,7 @@
                                 <a tabindex="0" class="help-icon" role="button"
                                    data-bs-toggle="popover" data-bs-placement="right"
                                    data-bs-title="Active Status"
-                                   data-bs-content="Active tiers appear in the tier dropdown when editing a customer record. Uncheck this to hide the tier from the dropdown without deleting it — useful for legacy tiers that still have customers assigned but should not be used for new assignments.">
+                                   data-bs-content="Active tiers appear in the tier dropdown when editing a customer record. Uncheck this to hide the tier from the dropdown without deleting it &mdash; useful for legacy tiers that still have customers assigned but should not be used for new assignments.">
                                     <i class="bi bi-question-circle"></i>
                                 </a>
                                 <div class="form-text">Inactive tiers cannot be assigned to new customers.</div>