Add white theme, post delete, and passkey authentication

- Rewrite CSS to light/white theme
- Add delete button (auth-gated) with confirm dialog
- Add passkey register/login/logout routes via @simplewebauthn
- Gate compose form and delete behind session authentication
- Add credentials table to SQLite schema
- Add SESSION_SECRET and WebAuthn env vars to docker-compose

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/app/routes/auth.logout.tsx b/app/routes/auth.logout.tsx
new file mode 100644
index 0000000..3b60231
--- /dev/null
+++ b/app/routes/auth.logout.tsx
@@ -0,0 +1,18 @@
+import { redirect } from "react-router";
+import type { Route } from "./+types/auth.logout";
+import { getSession, destroySession } from "~/lib/session.server";
+
+export async function loader() {
+  return redirect("/");
+}
+
+export async function action({ request }: Route.ActionArgs) {
+  const session = await getSession(request.headers.get("Cookie"));
+  return redirect("/", {
+    headers: { "Set-Cookie": await destroySession(session) },
+  });
+}
+
+export default function Logout() {
+  return null;
+}