feat: add semantic CSS stylesheets (#3274)

Co-authored-by: Cursor Agent <cursoragent@cursor.com>

biome.json

@@ -109,5 +109,27 @@
 		"parser": {
 			"tailwindDirectives": true
 		}
-	}
+	},
+	"overrides": [
+		{
+			"includes": ["docs/spec.json"],
+			"files": {
+				"maxSize": 2097152
+			},
+			"json": {
+				"formatter": {
+					"expand": "always"
+				}
+			}
+		},
+		{
+			"includes": ["packages/pdf/src/semantic/__fixtures__/**/*.css"],
+			"formatter": {
+				"enabled": false
+			},
+			"linter": {
+				"enabled": false
+			}
+		}
+	]
 }