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, 12 insertions, 0 deletions

diff --git a/app/lib/session.server.ts b/app/lib/session.server.ts
new file mode 100644
index 0000000..13a7cd1
--- /dev/null
+++ b/app/lib/session.server.ts
@@ -0,0 +1,12 @@
+import { createCookieSessionStorage } from "react-router";
+
+export const { getSession, commitSession, destroySession } = createCookieSessionStorage({
+  cookie: {
+    name: "__session",
+    secrets: [process.env.SESSION_SECRET ?? "dev-secret-change-in-production"],
+    secure: process.env.NODE_ENV === "production",
+    httpOnly: true,
+    sameSite: "lax",
+    maxAge: 60 * 60 * 24 * 30,
+  },
+});