Add manual "Sync Columbia" action and status to powder catalog admin

Phase 3: SuperAdmin-triggered sync. Adds a SyncColumbia POST action that runs
a full catalog sync on demand (bypassing the schedule) and reports the result
via TempData. The catalog index header gains a "Sync Columbia" button (with a
syncing spinner) and a status line showing the scheduled-sync on/off state,
last-synced time, and last-run summary, read from the platform settings.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/PowderCoating.Web/Controllers/PowderCatalogController.cs

@@ -1,5 +1,6 @@
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
+using PowderCoating.Application.Constants;
 using PowderCoating.Application.DTOs.Common;
 using PowderCoating.Application.DTOs.Inventory;
 using PowderCoating.Application.Interfaces;
@@ -19,15 +20,21 @@ public class PowderCatalogController : Controller
 
     private readonly IUnitOfWork _unitOfWork;
     private readonly IInventoryAiLookupService _aiLookupService;
+    private readonly IColumbiaCatalogSyncService _columbiaSyncService;
+    private readonly IPlatformSettingsService _platformSettings;
     private readonly ILogger<PowderCatalogController> _logger;
 
     public PowderCatalogController(
         IUnitOfWork unitOfWork,
         IInventoryAiLookupService aiLookupService,
+        IColumbiaCatalogSyncService columbiaSyncService,
+        IPlatformSettingsService platformSettings,
         ILogger<PowderCatalogController> logger)
     {
         _unitOfWork = unitOfWork;
         _aiLookupService = aiLookupService;
+        _columbiaSyncService = columbiaSyncService;
+        _platformSettings = platformSettings;
         _logger = logger;
     }
 
@@ -135,6 +142,11 @@ public class PowderCatalogController : Controller
             }
         };
 
+        // Columbia sync status for the admin panel (last run + master switch).
+        ViewBag.ColumbiaSyncEnabled = await _platformSettings.GetBoolAsync(ColumbiaIntegrationConstants.SettingEnabled);
+        ViewBag.ColumbiaLastSyncedAt = await _platformSettings.GetAsync(ColumbiaIntegrationConstants.SettingLastSyncedAt);
+        ViewBag.ColumbiaLastResult = await _platformSettings.GetAsync(ColumbiaIntegrationConstants.SettingLastResult);
+
         return View(vm);
     }
 
@@ -422,6 +434,24 @@ public class PowderCatalogController : Controller
         return Json(results);
     }
 
+    /// <summary>
+    /// Manually triggers a full Columbia Coatings catalog sync (SuperAdmin only). Bypasses the
+    /// scheduled interval. Reports the run outcome via TempData on the catalog index.
+    /// </summary>
+    [HttpPost]
+    [ValidateAntiForgeryToken]
+    public async Task<IActionResult> SyncColumbia(CancellationToken cancellationToken)
+    {
+        var result = await _columbiaSyncService.RunSyncAsync(cancellationToken);
+
+        if (result.Success)
+            TempData["Success"] = $"Columbia sync complete &mdash; {result.Summary}";
+        else
+            TempData["Error"] = $"Columbia sync failed: {result.ErrorMessage}";
+
+        return RedirectToAction(nameof(Index));
+    }
+
     // Private helpers
 
     private async Task ApplyTdsCureFallbackAsync(InventoryAiLookupResult result, string? colorName)

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

@@ -110,12 +110,42 @@
             <div class="text-muted small">Platform-level lookup library for inventory autofill, SDS/TDS links, and curing specs.</div>
         </div>
         <div class="d-flex gap-2">
+            <form asp-action="SyncColumbia" method="post" class="d-inline"
+                  onsubmit="this.querySelector('button').disabled=true;this.querySelector('button').innerHTML='<span class=\'spinner-border spinner-border-sm me-1\'></span>Syncing&hellip;';">
+                @Html.AntiForgeryToken()
+                <button type="submit" class="btn btn-outline-primary" title="Pull the latest Columbia Coatings catalog now">
+                    <i class="bi bi-cloud-download me-1"></i>Sync Columbia
+                </button>
+            </form>
             <a asp-action="Create" class="btn btn-primary">
                 <i class="bi bi-plus-circle me-1"></i>Add Powder
             </a>
         </div>
     </div>
 
+    @{
+        var columbiaLastSynced = ViewBag.ColumbiaLastSyncedAt as string;
+        var columbiaLastResult = ViewBag.ColumbiaLastResult as string;
+        var columbiaEnabled = ViewBag.ColumbiaSyncEnabled is true;
+    }
+    <div class="alert alert-light border d-flex flex-wrap align-items-center gap-2 small mb-4 alert-permanent">
+        <span class="badge @(columbiaEnabled ? "bg-success" : "bg-secondary")">
+            Scheduled sync @(columbiaEnabled ? "on" : "off")
+        </span>
+        @if (!string.IsNullOrWhiteSpace(columbiaLastSynced) && DateTime.TryParse(columbiaLastSynced, out var lastSyncedAt))
+        {
+            <span class="text-muted">Last synced @lastSyncedAt.ToLocalTime().ToString("MMM d, yyyy h:mm tt")</span>
+        }
+        else
+        {
+            <span class="text-muted">Never synced</span>
+        }
+        @if (!string.IsNullOrWhiteSpace(columbiaLastResult))
+        {
+            <span class="text-muted">&mdash; @columbiaLastResult</span>
+        }
+    </div>
+
     <div class="row g-3 mb-4 powder-catalog-summary">
         <div class="col-sm-6 col-xl-2">
             <div class="card h-100">