chore(apps): remove unused code and packages (DEAD-01, DEAD-02, DEAD-03)

Owner approved the deletions. Found by walking imports from each app's
main.ts; sw.ts stays (the PWA plugin's entry).
- user-app: 8 unreachable components, loadingStore.
- user-app-v2: 11 unreachable components, loadingStore.
- both: the unused validators and price helpers, and the gsap and
  @ant-design/icons-vue packages.
- the stray root user-app-v2/ folder (an old package.json and
  vite.config.ts that nothing referenced).
Both apps type-check clean.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/user-app/src/stores/loadingStore.ts

@@ -1,14 +0,0 @@
-// Ported from legacy henza_pwa/src/store/loadingStore.ts — a single global
-// loading flag, converted from the hand-rolled ref-class to Pinia.
-import { defineStore } from 'pinia'
-
-export const useLoadingStore = defineStore('loading', {
-  state: () => ({
-    loading: false,
-  }),
-  actions: {
-    setLoading(loading: boolean) {
-      this.loading = loading
-    },
-  },
-})