Move Job Templates from sidebar nav to Jobs page header button

Templates button sits alongside Board and Blank Work Order in the
Jobs index action bar. Nav item and the now-redundant "& Templates"
section title are removed, trimming one more item from the sidebar.

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

src/PowderCoating.Web/Views/Jobs/Index.cshtml

@@ -108,6 +108,9 @@
                     <a asp-action="Board" class="btn btn-outline-secondary text-nowrap">
                         <i class="bi bi-kanban me-1"></i>Board
                     </a>
+                    <a asp-controller="JobTemplates" asp-action="Index" class="btn btn-outline-secondary text-nowrap" title="Manage job templates">
+                        <i class="bi bi-layout-text-window-reverse me-1"></i><span class="d-none d-md-inline">Templates</span>
+                    </a>
                     <a href="@Url.Action("Blank", "WorkOrder")" target="_blank" class="btn btn-outline-secondary text-nowrap" title="Print a blank work order form">
                         <i class="bi bi-printer me-1"></i><span class="d-none d-md-inline">Blank Work Order</span>
                     </a>