Add web/.gitignore (node_modules + build output)

web/.gitignore

@@ -0,0 +1,15 @@
+# DOP /web — build & dependency exclusions
+# Source lives in git; generated/heavy artifacts stay out.
+
+# Dependencies (never commit)
+node_modules/
+
+# Compiled Tailwind output — regenerable via: npm run build
+# (dist.css is currently committed for deployment convenience;
+#  it is NOT source-of-truth. Rebuild before deploy to avoid stale copy.)
+assets/css/dist.css
+
+# OS / editor noise
+.DS_Store
+Thumbs.db
+*.log