feat: refine metadata catalog workflows

frontend/src/shell/database-management/FleetActionSelector.tsx

@@ -44,7 +44,6 @@ export function FleetActionSelector<ActionId extends string>({
   selectedCount,
   hiddenSelectedCount = 0,
   busy = false,
-  busyLabel = "Running…",
   selectRef,
   onRun,
   onClear,
@@ -102,7 +101,7 @@ export function FleetActionSelector<ActionId extends string>({
         className="thot-fleet-action-selector__select"
         aria-label={label}
         value={selectedActionId}
-        disabled={busy}
+        disabled={busy || selectedCount === 0}
         onChange={(event) => setSelectedActionId(event.target.value as ActionId | "")}
       >
         <option value="">Choose an action…</option>
@@ -123,13 +122,14 @@ export function FleetActionSelector<ActionId extends string>({
       <Button
         type="button"
         size="sm"
-        variant={selectedAction?.tone === "destructive" ? "destructive" : "default"}
+        variant="destructive"
+        className="bg-destructive text-destructive-foreground hover:bg-destructive/90"
         disabled={!selectedAction || selectedAction.disabled || busy}
         aria-describedby={unavailableReason ? `${hintId}-reason` : undefined}
         onClick={() => void run()}
       >
         <Play aria-hidden="true" />
-        {busy ? busyLabel : selectedAction?.runLabel ?? "Run action"}
+        Run action
       </Button>
       <Button type="button" size="sm" variant="ghost" disabled={busy} onClick={onClear}>
         <X aria-hidden="true" /> Clear