Improve UI performance by optimizing reactivity

- Replace `ref`s with `shallowRef` when deep reactivity is not needed.
- Replace `readonly`s with `shallowReadonly` where the goal is to only
  prevent `.value` mutation.
- Remove redundant `ref` in `SizeObserver.vue`.
- Remove redundant nested `ref` in `TooltipWrapper.vue`.
- Remove redundant `events` export from `UseCollectionState.ts`.
- Remove redundant `computed` from `UseCollectionState.ts`.
- Remove `timestamp` from `TreeViewFilterEvent` that becomes unnecessary
  after using `shallowRef`.
- Add missing unit tests for `UseTreeViewFilterEvent`.
- Add missing stub for `FilterChangeDetails`.

src/presentation/components/Scripts/View/Tree/TreeView/Bindings/TreeInputFilterEvent.ts

@@ -2,14 +2,6 @@ import type { ReadOnlyTreeNode } from '../Node/TreeNode';
 
 export interface TreeViewFilterEvent {
   readonly action: TreeViewFilterAction;
-  /**
-   * A simple numeric value to ensure uniqueness of each event.
-   *
-   * This property is used to guarantee that the watch function will trigger
-   * even if the same filter action value is emitted consecutively.
-   */
-  readonly timestamp: Date;
-
   readonly predicate?: TreeViewFilterPredicate;
 }
 
@@ -25,7 +17,6 @@ export function createFilterTriggeredEvent(
 ): TreeViewFilterEvent {
   return {
     action: TreeViewFilterAction.Triggered,
-    timestamp: new Date(),
     predicate,
   };
 }
@@ -33,6 +24,5 @@ export function createFilterTriggeredEvent(
 export function createFilterRemovedEvent(): TreeViewFilterEvent {
   return {
     action: TreeViewFilterAction.Removed,
-    timestamp: new Date(),
   };
 }