refactor(ui): replace modal dialogs with toast/sheet components

Remove DialogVant/NotifyVant and add Toast and Sheet components with
useToast, useReveal, and usePageTransition composables. Rework
Navigation, RegisterView, and styles across both apps; rebuild dist assets.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/user-app/src/components/home/AccountStrip.vue

@@ -78,7 +78,7 @@ const fiat = computed(() => (props.customer ? props.customer.fiatDebtRial.split(
 .acct {
   border-radius: 20px;
   padding: 18px;
-  background: @ink;
+  background: @primary;
   color: #fff;
   box-shadow: 0 22px 44px -32px rgba(20, 22, 26, 0.9);
 }

apps/user-app/src/components/home/CategoryRail.vue

@@ -61,8 +61,8 @@ const emit = defineEmits<{ (e: 'select', cat: HomeCategory): void }>()
 }
 
 .rail__chip.is-active {
-  background: @ink;
-  border-color: @ink;
+  background: @primary;
+  border-color: @primary;
   color: #fff;
 }
 

apps/user-app/src/components/home/RateStrip.vue

@@ -39,7 +39,7 @@ const perGram = computed(() => (props.quote ? props.quote.pricePerGramRial.split
   gap: 10px;
   padding: 10px 14px;
   border-radius: 14px;
-  background: @ink;
+  background: @primary;
   color: #fff;
   box-shadow: 0 10px 24px -18px rgba(20, 22, 26, 0.9);
 }