Edit the prompt appendix as markdown, bump twui

The install-wide appendix now uses the shared CodeEditor (AceEditor,
markdown mode) instead of a plain textarea, discarding by remounting the
editor with the saved text. The storage quota field moves to the twui
0.1.6 number input, so the dependency is bumped with it.

package.json

@@ -40,7 +40,7 @@
         "@modelcontextprotocol/sdk": "^1.32.1",
         "@moduletrace/bun-sqlite": "^1.3.0",
         "@moduletrace/bunext": "^1.3.3",
-        "@moduletrace/twui": "^0.1.5",
+        "@moduletrace/twui": "^0.1.6",
         "@tiptap/extension-bubble-menu": "3.32.0",
         "@tiptap/extension-mention": "3.32.0",
         "@tiptap/extension-placeholder": "3.32.0",