chore: remove bundled IBM Plex fonts

packages/ui/package.json

@@ -42,9 +42,6 @@
     "@dnd-kit/core": "^6.3.1",
     "@dnd-kit/sortable": "^10.0.0",
     "@dnd-kit/utilities": "^3.2.2",
-    "@fontsource/ibm-plex-mono": "^5.2.7",
-    "@fontsource/ibm-plex-sans": "^5.1.1",
-    "@ibm/plex": "^6.4.1",
     "@lezer/highlight": "^1.2.3",
     "@opencode-ai/sdk": "^1.17.12",
     "@pierre/diffs": "1.3.0-beta.6",