Miscellaneous UI and pricing updates from prior sessions

- PricingCalculationService: powder coverage and specific gravity math fixes
- Dashboard/Index: minor widget updates
- Jobs/Details, Jobs/Intake: shop floor and intake view improvements
- Quotes/Details: detail view updates
- GiftCertificates/Details: detail view update
- job-photos.js: photo gallery improvements

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/PowderCoating.Web/Views/GiftCertificates/Details.cshtml

@@ -38,7 +38,7 @@
         }
         @if (Model.ExpiryDate.HasValue)
         {
-            <span class="ms-2 small">· Expires @Model.ExpiryDate.Value.Tz(ViewBag.CompanyTimeZone as string).ToString("MMMM d, yyyy")</span>
+            <span class="ms-2 small">&middot; Expires @Model.ExpiryDate.Value.Tz(ViewBag.CompanyTimeZone as string).ToString("MMMM d, yyyy")</span>
         }
     </div>
 </div>