fix: theme switching causing constant color transitions, too much shadow on codeblocks in light theme

package.json

@@ -24,6 +24,7 @@
     "astro-icon": "^1.1.5",
     "hast-util-from-html": "^2.0.3",
     "hastscript": "^9.0.1",
+    "jsdom": "^28.1.0",
     "rehype": "^13.0.2",
     "remark-github-blockquote-alert": "^2.0.1",
     "solid-js": "^1.9.11",
@@ -37,6 +38,7 @@
     "@biomejs/biome": "^2.3.15",
     "@types/babel__core": "^7.20.5",
     "@types/hast": "^3.0.4",
+    "@types/jsdom": "^27.0.0",
     "@types/mdast": "^4.0.4",
     "@types/node": "^25.2.3",
     "@types/unist": "^3.0.3",