Hide churned trial accounts from company/health screens by default

- Companies list and Company Health now hide Expired/Canceled accounts
  whose subscription ended 14+ days ago; show/hide toggle via banner
- KPI cards on Company Health exclude churned tenants when hidden
- showChurned param threads through sort, pagination, search, and filter forms
- Powder catalog: fix missing UnitPrice on user-contributed entries;
  add back-sync to fill catalog gaps on existing matches; wire
  AiAugmentFromUrl and manual inventory Create into catalog contribute path

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

src/PowderCoating.Core/Interfaces/Services/ICompanyListService.cs

@@ -31,10 +31,13 @@ public interface ICompanyListService
 {
     /// <summary>
     /// Returns a paged, searched, and sorted slice of non-deleted companies together with the
-    /// total unfiltered count for pagination.
+    /// total count for pagination and the count of churned accounts that are currently hidden.
+    /// When <paramref name="hideChurned"/> is true, Expired/Canceled companies whose subscription
+    /// ended more than 14 days ago are excluded from results (but still counted for the banner).
     /// </summary>
-    Task<(List<Company> Companies, int TotalCount)> GetPagedAsync(
-        string? searchTerm, string sortColumn, string sortDirection, int page, int pageSize);
+    Task<(List<Company> Companies, int TotalCount, int ChurnedCount)> GetPagedAsync(
+        string? searchTerm, string sortColumn, string sortDirection, int page, int pageSize,
+        bool hideChurned = true);
 
     /// <summary>
     /// Returns job, quote, customer, and wizard completion counts for each of the supplied