fix: correctly cancel select all assets (#26067)

web/src/lib/stores/asset-interaction.svelte.ts

@@ -6,6 +6,7 @@ import { fromStore } from 'svelte/store';
 
 export class AssetInteraction {
   selectedAssets = $state<TimelineAsset[]>([]);
+  selectAll = $state(false);
   hasSelectedAsset(assetId: string) {
     return this.selectedAssets.some((asset) => asset.id === assetId);
   }
@@ -65,6 +66,8 @@ export class AssetInteraction {
   }
 
   clearMultiselect() {
+    this.selectAll = false;
+
     // Multi-selection
     this.selectedAssets = [];
     this.selectedGroup.clear();

web/src/lib/stores/assets-store.svelte.ts

@@ -1,3 +0,0 @@
-import { writable } from 'svelte/store';
-
-export const isSelectingAllAssets = writable(false);