fix(gallery): register JS action event listeners for Reset Filters and Clear Selection

Gallery widget has all infrastructure for external JS actions support
but never registered event listeners, causing "Reset All Filters" and
"Clear Selection" actions to fire into the void.

This change:
- Creates useGalleryJSActions() helper to register event listeners
- Integrates hook into GalleryWidget component
- Mirrors datagrid's working implementation pattern

Infrastructure already existed:
- @mendix/widget-plugin-external-events dependency
- Config with name and filtersChannelName
- SelectActionsProvider with clearSelection() method
- Filter system with CombinedFilter

The fix is minimal - just wires up the listeners.

Jira: WC-3462

Author: r0b1n

packages/pluggableWidgets/gallery-web/CHANGELOG.md

@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased]
 
+### Fixed
+
+- We fixed an issue where "Reset All Filters" and "Clear Selection" JavaScript actions did not work with the Gallery widget. Event listeners were not registered despite the required infrastructure being in place.
+
 ## [3.11.0] - 2026-05-27
 
 ### Added

packages/pluggableWidgets/gallery-web/src/components/GalleryWidget.tsx

@@ -9,8 +9,10 @@ import { GalleryRoot as Root } from "./GalleryRoot";
 import { GalleryTopBar as TopBar } from "./GalleryTopBar";
 import { GalleryTopBarControls as TopBarControls } from "./GalleryTopBarControls";
 import { RefreshStatus } from "./RefreshStatus";
+import { useGalleryJSActions } from "../helpers/useGalleryJSActions";
 
 export function GalleryWidget(): ReactElement {
+    useGalleryJSActions();
     return (
         <Root>
             <TopBar>

packages/pluggableWidgets/gallery-web/src/helpers/useGalleryJSActions.ts

@@ -0,0 +1,13 @@
+import { useOnClearSelectionEvent, useOnResetFiltersEvent } from "@mendix/widget-plugin-external-events/hooks";
+import { useGalleryConfig, useSelectActions } from "../model/hooks/injection-hooks";
+
+export function useGalleryJSActions(): void {
+    const config = useGalleryConfig();
+    const selectActions = useSelectActions();
+
+    useOnResetFiltersEvent(config.name, config.filtersChannelName);
+    useOnClearSelectionEvent({
+        widgetName: config.name,
+        listener: () => selectActions.clearSelection()
+    });
+}