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/themeConfig/colors.json

@@ -1,8 +1,8 @@
 {
   "white": "#fff",
   "black": "#000",
-  "primary": "#1C2D56",
-  "primaryLighten": "#1C3362",
+  "primary": "#23493c",
+  "primaryLighten": "#2E5E4E",
   "secondary": "#8D6A46",
   "light": "#f9f9f9",
   "grey": "#898989",