refactor(dashboard): move search box to filter bar after period dropdown

Search was hidden in card header — now inline with filters for better
discoverability. Compact refresh button to icon-only. On mobile, search
and period dropdown share the same row via flex.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/app/static/css/style.css

@@ -430,7 +430,7 @@ tr.mapping-deleted td {
     border-radius: 0.375rem;
     font-size: 0.9375rem;
     outline: none;
-    min-width: 180px;
+    width: 160px;
 }
 .search-input:focus { border-color: var(--blue-600); }
 
@@ -705,7 +705,7 @@ tr.mapping-deleted td {
         gap: 0.375rem;
     }
     .filter-pill { padding: 0.25rem 0.5rem; font-size: 0.8125rem; }
-    .search-input { min-width: 0; width: 100%; }
+    .search-input { min-width: 0; width: auto; flex: 1; }
     .page-btn.page-number { display: none; }
     .page-btn.page-ellipsis { display: none; }
     .table-responsive { display: none; }