chore: clean up repo root and improve .gitignore

- Remove debug scripts: check_albums.js, check_albums.ts
- Remove git-filter-repo binary from root
- Untrack server.log (was accidentally committed)
- Delete .DS_Store files
- Rewrite .gitignore with clear sections: deps, next.js,
  TypeScript, testing, logs, env, OS/editor, agent tools,
  one-off scripts, deployment, user content
- Add .Jules/ and *.log glob to .gitignore

.gitignore

@@ -1,60 +1,64 @@
-# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
-
-# dependencies
+# ── Dependencies ─────────────────────────────────────
 /node_modules
 /.pnp
 .pnp.*
+
+# Yarn (keep patches/plugins/releases)
 .yarn/*
 !.yarn/patches
 !.yarn/plugins
 !.yarn/releases
 !.yarn/versions
 
-# testing
+# ── Next.js ──────────────────────────────────────────
+/.next/
+/out/
+/build
+next-env.d.ts
+
+# ── TypeScript ────────────────────────────────────────
+*.tsbuildinfo
+
+# ── Testing & Coverage ───────────────────────────────
 /coverage
 /test-results/
 /playwright-report/
-.agent/
 
-# next.js
-/.next/
-/out/
-
-# production
-/build
-
-# misc
-.DS_Store
-*.pem
-
-# debug
+# ── Logs ─────────────────────────────────────────────
+*.log
 npm-debug.log*
 yarn-debug.log*
 yarn-error.log*
 .pnpm-debug.log*
-server.log
 
-# env files (can opt-in for committing if needed)
+# ── Environment ──────────────────────────────────────
 .env*
 !.env.local.example
 
-# vercel
+# ── OS & Editor ──────────────────────────────────────
+.DS_Store
+Thumbs.db
+*.pem
+.vscode/settings.json
+.idea/
+
+# ── Agent & Dev Tools ────────────────────────────────
+.agent/
+.Jules/
+
+# ── One-off Scripts (Root) ───────────────────────────
+/check_albums.js
+/check_albums.ts
+/git-filter-repo
+
+# ── Deployment ───────────────────────────────────────
 .vercel
 
-# typescript
-*.tsbuildinfo
-next-env.d.ts
-
-# internal dev docs
-docs/dev/
-
-# Build cache
-tsconfig.tsbuildinfo
-content/about.md
-
-#content
+# ── User Content (personal gallery config) ───────────
 content/settings.yaml
 content/gallery.yaml
+content/about.md
 
-#git-filter-repo    
-git-filter-repo
+# ── Internal Dev Docs ────────────────────────────────
+docs/dev/
+docs/ideas.md