router implementation

client/src/pages/mod.rs

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+// src/pages/mod.rs
+
+pub mod routing;

client/src/pages/routing/mod.rs

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+// src/pages/routing/mod.rs
+
+pub mod router;
+
+pub use router::{Page, Router};

client/src/pages/routing/router.rs

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+// src/pages/routing/router.rs
+use crate::state::pages::{
+    admin::AdminState,
+    auth::{AuthState, LoginState, RegisterState},
+    form::FormState,
+    intro::IntroState,
+    add_logic::AddLogicState,
+    add_table::AddTableState,
+};
+
+#[derive(Debug)]
+pub enum Page {
+    Intro(IntroState),
+    Login(LoginState),
+    Register(RegisterState),
+    Admin(AdminState),
+    AddLogic(AddLogicState),
+    AddTable(AddTableState),
+    Form(FormState),
+}
+
+pub struct Router {
+    pub current: Page,
+}
+
+impl Router {
+    pub fn new() -> Self {
+        Self {
+            current: Page::Intro(IntroState::default()),
+        }
+    }
+
+    pub fn navigate(&mut self, page: Page) {
+        self.current = page;
+    }
+}