feat: initial LMS frontend with adaptive navigation and routing

main.py

@@ -0,0 +1,93 @@
+import flet as ft
+
+from app.layout import main_layout
+from app.pages.login import login_page
+from app.pages.articles import articles_page
+from app.pages.courses import courses_page
+from app.pages.my_courses import my_courses_page
+from app.pages.progress import progress_page
+from app.pages.profile import profile_page
+from app.state import state
+
+async def main(page: ft.Page):
+    page.title = "LMS Frontend"
+
+    # register font
+    page.fonts = {
+        "NotoSansThai": "assets/fonts/NotoSansThai-Regular.ttf",
+        "NotoSansThaiMedium": "assets/fonts/NotoSansThai-Medium.ttf",
+        "NotoSansThaiBold": "assets/fonts/NotoSansThai-Bold.ttf",
+    }
+
+    page.theme = ft.Theme(font_family="NotoSansThai")
+
+    # GLOBAL CONTAINER (รองรับ Persistent Layout + Dynamic Content)
+    main_container = ft.Container(expand=True)
+
+    # ROUTES MAP
+    routes = {
+        "/articles": articles_page,
+        "/courses": courses_page,
+        "/my_courses": my_courses_page,
+        "/progress": progress_page,
+        "/profile": profile_page,
+    }
+
+    # ROUTING
+    async def route_change(e):
+        print(">>> route_change:", page.route)
+
+        # กัน user แอบเข้า /main โดยไม่ login
+        if page.route != "/login" and not state.access_token:
+            await page.push_route("/login")
+            return
+
+        # LOGIN
+        if page.route == "/login":
+            page.views.clear()
+
+            page.views.append(
+                ft.View(
+                    route="/login",
+                    controls=[
+                        login_page(page, on_login_success=go_articles)
+                    ],
+                    horizontal_alignment=ft.CrossAxisAlignment.CENTER,
+                    vertical_alignment=ft.MainAxisAlignment.CENTER,
+                )
+            )
+
+        # MAIN
+        else:
+            # สร้าง view ครั้งเดียว
+            if not page.views or page.views[-1].route != "/main":
+                page.views.clear()
+
+                page.views.append(
+                    ft.View(
+                        route="/main",
+                        controls=[
+                            main_layout(page, main_container)
+                        ],
+                    )
+                )
+
+            # เปลี่ยน content อย่างเดียว
+            if page.route in routes:
+                main_container.content = routes[page.route]()
+            else:
+                main_container.content = ft.Text("404 NOT FOUND")
+
+        page.update()
+
+    # LOGIN SUCCESS
+    async def go_articles():
+        print(">>> GO ARTICLES")
+        await page.push_route("/articles")
+
+    page.on_route_change = route_change
+
+    # start app
+    await page.push_route("/login")
+
+ft.run(main)