Introduce new TreeView UI component

Key highlights:

- Written from scratch to cater specifically to privacy.sexy's
  needs and requirements.
- The visual look mimics the previous component with minimal changes,
  but its internal code is completely rewritten.
- Lays groundwork for future functionalities like the "expand all"
  button a flat view mode as discussed in #158.
- Facilitates the transition to Vue 3 by omitting the Vue 2.0 dependent
  `liquour-tree` as part of #230.

Improvements and features:

- Caching for quicker node queries.
- Gradual rendering of nodes that introduces a noticable boost in
  performance, particularly during search/filtering.
  - `TreeView` solely governs the check states of branch nodes.

Changes:

- Keyboard interactions now alter the background color to highlight the
  focused item. Previously, it was changing the color of the text.
- Better state management with clear separation of concerns:
  - `TreeView` exclusively manages indeterminate states.
  - `TreeView` solely governs the check states of branch nodes.
  - Introduce transaction pattern to update state in batches to minimize
    amount of events handled.
- Improve keyboard focus, style background instead of foreground. Use
  hover/touch color on keyboard focus.
- `SelectableTree` has been removed. Instead, `TreeView` is now directly
  integrated with `ScriptsTree`.
- `ScriptsTree` has been refactored to incorporate hooks for clearer
  code and separation of duties.
- Adopt Vue-idiomatic bindings instead of keeping a reference of the
  tree component.
- Simplify and change filter event management.
- Abandon global styles in favor of class-scoped styles.
- Use global mixins with descriptive names to clarify indended
  functionality.

src/presentation/components/Scripts/View/Tree/TreeViewAdapter/UseSelectedScriptNodeIds.ts

@@ -0,0 +1,40 @@
+import {
+  computed, inject, readonly, ref,
+} from 'vue';
+import { InjectionKeys } from '@/presentation/injectionSymbols';
+import { SelectedScript } from '@/application/Context/State/Selection/SelectedScript';
+import { getScriptNodeId } from './CategoryNodeMetadataConverter';
+
+export function useSelectedScriptNodeIds(scriptNodeIdParser = getScriptNodeId) {
+  const { selectedScripts } = useSelectedScripts();
+
+  const selectedNodeIds = computed<readonly string[]>(() => {
+    return selectedScripts
+      .value
+      .map((selected) => scriptNodeIdParser(selected.script));
+  });
+
+  return {
+    selectedScriptNodeIds: readonly(selectedNodeIds),
+  };
+}
+
+function useSelectedScripts() {
+  const { events } = inject(InjectionKeys.useAutoUnsubscribedEvents)();
+  const { onStateChange } = inject(InjectionKeys.useCollectionState)();
+
+  const selectedScripts = ref<readonly SelectedScript[]>([]);
+
+  onStateChange((state) => {
+    selectedScripts.value = state.selection.selectedScripts;
+    events.unsubscribeAllAndRegister([
+      state.selection.changed.on((scripts) => {
+        selectedScripts.value = scripts;
+      }),
+    ]);
+  }, { immediate: true });
+
+  return {
+    selectedScripts: readonly(selectedScripts),
+  };
+}