refactor: use codebuff/custom branch instead of commit hash for opentui

Switch from pinned commit to tracking the codebuff/custom branch for easier updates.

Author: brandonkachen

bun.lock

@@ -28,9 +28,9 @@
   },
   "dependencies": {
     "@codebuff/sdk": "workspace:*",
-    "@opentui/core": "github:CodebuffAI/opentui#48803504f3bd5fce838a70bbae765d096c61d3a9",
+    "@opentui/core": "github:CodebuffAI/opentui#codebuff/custom",
     "@opentui/core-darwin-arm64": "0.1.26",
-    "@opentui/react": "github:CodebuffAI/opentui#48803504f3bd5fce838a70bbae765d096c61d3a9",
+    "@opentui/react": "github:CodebuffAI/opentui#codebuff/custom",
     "react": "^19.0.0",
     "react-reconciler": "^0.32.0",
     "remark-parse": "^11.0.0",