fix(ui): keep trash counter in sync with trash changes

Reload the rail trash count after every operation that changes the
trash contents, not just navigation and empty-trash: moving photos to
trash (grid, panel, viewer), restoring, permanent delete and deleting
an album. Previously the counter stayed stale until the next route
change.

frontend/src/routes/(app)/albums/[id]/+page.svelte

@@ -13,6 +13,7 @@
 	import { density } from '$lib/stores/density.svelte';
 	import { selection } from '$lib/stores/selection.svelte';
 	import { photoUpdates } from '$lib/stores/photo-updates.svelte';
+	import { trash } from '$lib/stores/trash.svelte';
 	import { viewerReturn } from '$lib/stores/viewer-return';
 	import { transfer } from '$lib/stores/transfer.svelte';
 	import { contextMenu, type ContextMenuItem } from '$lib/stores/context-menu.svelte';
@@ -295,6 +296,7 @@
 			await photosApi.deleteBatch(selection.ids);
 			selection.clear();
 			pendingDelete = false;
+			await trash.load();
 		} catch (e) {
 			error = (e as Error).message;
 		} finally {