Add server-backed file property filters

webui/src/styles/file-manager.css

@@ -11,6 +11,31 @@
   padding: 4px 0 10px 14px;
 }
 
+.file-property-filter-row {
+  display: flex;
+  align-items: end;
+  gap: 12px;
+  min-width: 0;
+  padding: 0 0 10px 14px;
+}
+
+.file-property-filter-field {
+  display: grid;
+  gap: 4px;
+  min-width: 180px;
+}
+
+.file-property-filter-field > span,
+.file-property-filter-count {
+  color: var(--muted);
+  font-size: var(--font-size-sm);
+}
+
+.file-property-filter-count {
+  align-self: center;
+  margin-left: auto;
+}
+
 .file-list-drop-target.is-active,
 .file-list-drop-target.is-drop-target {
   background: var(--line);
@@ -565,6 +590,15 @@
   .file-search-row {
     grid-template-columns: 1fr;
   }
+
+  .file-property-filter-row {
+    align-items: stretch;
+    flex-direction: column;
+  }
+
+  .file-property-filter-count {
+    margin-left: 0;
+  }
 }
 
 .file-conflict-summary {