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, 11 insertions, 0 deletions

diff --git a/app/lib/passkey.server.ts b/app/lib/passkey.server.ts
new file mode 100644
index 0000000..e88c4f8
--- /dev/null
+++ b/app/lib/passkey.server.ts
@@ -0,0 +1,11 @@
+export const rpID =
+  process.env.WEBAUTHN_RP_ID ??
+  (process.env.NODE_ENV === "production" ? "blog.yyamashita.com" : "localhost");
+
+export const origin =
+  process.env.WEBAUTHN_ORIGIN ??
+  (process.env.NODE_ENV === "production"
+    ? "https://blog.yyamashita.com"
+    : "http://localhost:5173");
+
+export const rpName = "microblog";