Add new styles for home and landing pages

- Created home.css with comprehensive styles for the home page layout, including typography, buttons, and responsive design adjustments.
- Created landing.css to style the landing page, focusing on typography, layout, and responsive behavior for various screen sizes.

scripts/dashboard-preview.ts

@@ -0,0 +1,57 @@
+// Isolated browser QA server. Never opens or changes the user's database.
+import { fixture } from "../src/habits/test-fixture";
+import { createApi } from "../src/api";
+import index from "../src/index.html";
+
+const f = fixture();
+const origin = "http://127.0.0.1:3107";
+const previewCookie = "minabot_dashboard_preview_session";
+const app = createApi(
+  f.db,
+  {
+    origin,
+    clientId: "",
+    clientSecret: "",
+    cookieSecret: "preview-only-secret-at-least-32-characters",
+  },
+  undefined,
+  () => Date.parse("2026-09-04T12:00:00Z"),
+);
+const server = Bun.serve({
+  hostname: "127.0.0.1",
+  port: 3107,
+  routes: {
+    "/__preview/login": () =>
+      new Response(null, {
+        status: 302,
+        headers: {
+          Location: "/",
+          "Set-Cookie": `${previewCookie}=${"a".repeat(43)}; Path=/; HttpOnly; SameSite=Lax`,
+        },
+      }),
+    "/api/*": async (request) => {
+      // Translate only the preview cookie; never use or overwrite a real session.
+      const cookie = request.headers
+        .get("cookie")
+        ?.split(";")
+        .map((value) => value.trim())
+        .find((value) => value.startsWith(`${previewCookie}=`));
+      const headers = new Headers(request.headers);
+      headers.set(
+        "cookie",
+        cookie ? cookie.replace(previewCookie, "minabot_session") : "",
+      );
+      const response = await app.fetch(new Request(request, { headers }));
+      const setCookie = response.headers.get("set-cookie");
+      if (setCookie)
+        response.headers.set(
+          "set-cookie",
+          setCookie.replace("minabot_session", previewCookie),
+        );
+      return response;
+    },
+    "/*": index,
+  },
+  development: true,
+});
+console.log(`Disposable dashboard preview: ${server.url}__preview/login`);