feat: wrap frontend routes in FrontendLayout via router #[layout] attribute

- All public-facing pages (Home, Archives, Tags, PostDetail, Search,
  About, HomePage) are now wrapped in #[layout(FrontendLayout)]
- Header and Footer stay mounted during page transitions, only the
  <Outlet> content swaps — eliminates full-page flash/flicker
- Login and Register routes moved outside FrontendLayout since they
  are standalone pages without navigation header
- Route order restructured: FrontendLayout block → admin nest → auth pages
- Note: #[end_layout]/#[end_nest] must have a variant after them in the
  enum, otherwise the Routable derive macro fails with 'expected identifier'

src/router.rs

@@ -2,6 +2,7 @@ use dioxus::prelude::*;
 use std::sync::Arc;
 
 use crate::components::admin_layout::AdminLayout;
+use crate::components::frontend_layout::FrontendLayout;
 use crate::context::UserContext;
 use crate::pages::about::About;
 use crate::pages::admin::{Admin, Posts, Write};
@@ -17,26 +18,11 @@ use crate::theme::{use_theme_provider, Theme, ThemePreload};
 #[derive(Clone, Routable, Debug, PartialEq)]
 #[rustfmt::skip]
 pub enum Route {
+    #[layout(FrontendLayout)]
         #[route("/")]
         Home {},
         #[route("/page/:page")]
         HomePage { page: i32 },
-    #[route("/login")]
-    Login {},
-    #[route("/register")]
-    Register {},
-
-    #[nest("/admin")]
-    #[layout(AdminLayout)]
-        #[route("/")]
-        Admin {},
-        #[route("/write")]
-        Write {},
-        #[route("/posts")]
-        Posts {},
-    #[end_layout]
-    #[end_nest]
-
         #[route("/archives")]
         Archives {},
         #[route("/tags")]
@@ -49,6 +35,23 @@ pub enum Route {
         Search {},
         #[route("/about")]
         About {},
+    #[end_layout]
+
+    #[nest("/admin")]
+    #[layout(AdminLayout)]
+        #[route("/")]
+        Admin {},
+        #[route("/write")]
+        Write {},
+        #[route("/posts")]
+        Posts {},
+    #[end_layout]
+    #[end_nest]
+
+    #[route("/login")]
+    Login {},
+    #[route("/register")]
+    Register {},
 }
 
 #[component]