ui redesign, markdown fix + metadata and auth header

.gitignore

@@ -8,10 +8,8 @@ Thumbs.db
 
 # Environment
 .env
-.env.local
-.env.development.local
-.env.test.local
-.env.production.local
+.env.*
+!.env.example
 docker-compose.override.yml
 
 # Backend (Rust)
@@ -27,9 +25,8 @@ frontend/yarn-debug.log*
 frontend/yarn-error.log*
 frontend/.pnpm-debug.log*
 
-# Data (Persistent storage)
-# We might want to keep the directory structure but ignore the actual content
-# data/posts/*
-# data/uploads/*
-# !data/posts/hello-world.md
-# !data/posts/another-post.md
+# Persistent runtime data — your blog's content lives here on the deployed
+# host, not in the repo. The two seed posts under data/posts/ ship with the
+# initial commit; new files created by the editor stay local.
+data/uploads/
+data/config.json