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/Shared/Modal/ModalContent.vue

@@ -18,7 +18,7 @@
 </template>
 
 <script lang="ts">
-import { defineComponent, ref } from 'vue';
+import { defineComponent, shallowRef } from 'vue';
 
 export default defineComponent({
   props: {
@@ -31,7 +31,7 @@ export default defineComponent({
     'transitionedOut',
   ],
   setup(_, { emit }) {
-    const modalElement = ref<HTMLElement>();
+    const modalElement = shallowRef<HTMLElement>();
 
     function onAfterTransitionLeave() {
       emit('transitionedOut');