chore: remove bundled IBM Plex fonts

package.json

@@ -102,12 +102,9 @@
     "@codemirror/search": "^6.6.0",
     "@codemirror/state": "^6.5.4",
     "@codemirror/view": "6.39.13",
-    "@fontsource/ibm-plex-mono": "^5.2.7",
-    "@fontsource/ibm-plex-sans": "^5.1.1",
     "@heroui/scroll-shadow": "^2.3.18",
     "@heroui/system": "^2.4.23",
     "@heroui/theme": "^2.4.23",
-    "@ibm/plex": "^6.4.1",
     "@lezer/highlight": "^1.2.3",
     "@octokit/rest": "^22.0.1",
     "@opencode-ai/sdk": "^1.17.12",