Add basic login screen with form-based authentication

Adds /login route with HTML template that handles GET (show form) and
POST (authenticate). On successful login, sets session cookie and
redirects to /. Also adds framework support for redirects and cookies
in route handlers.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

express/basic/routes.ts

@@ -1,18 +1,29 @@
 import { DateTime } from "ts-luxon";
 import type { Call, Result, Route } from "../types";
 import { html, render } from "../util";
+import { loginRoute } from "./login";
 
 const routes: Record<string, Route> = {
     hello: {
         path: "/hello",
         methods: ["GET"],
-        handler: async (call: Call): Promise<Result> => {
+        handler: async (_call: Call): Promise<Result> => {
             const now = DateTime.now();
             const c = await render("basic/hello", { now });
 
             return html(c);
         },
     },
+    home: {
+        path:'/',
+        methods:['GET'],
+        handler:async(_call:Call): Promise<Result> => {
+            const c = await render('basic/home')
+
+            return html(c)
+        }
+    },
+    login: loginRoute,
 };
 
 export { routes };