fix(webui): use tabler fork icon

THIRD_PARTY_NOTICES.md

@@ -5,6 +5,37 @@ nanobot Python distribution (`pip install nanobot-ai`).
 
 ---
 
+## Tabler Icons — interface icons (MIT)
+
+- **Source**: https://github.com/tabler/tabler-icons
+- **Bundled**: `nanobot/web/dist/assets/index-*.js` (inline `arrow-fork` SVG)
+
+```
+MIT License
+
+Copyright (c) 2020-2026 Paweł Kuna
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+```
+
+---
+
 ## KaTeX — math rendering (MIT)
 
 - **Source**: https://github.com/KaTeX/KaTeX

webui/src/components/MessageBubble.tsx

@@ -63,10 +63,10 @@ function ForkArrowIcon({ className }: { className?: string }) {
       className={className}
       aria-hidden
     >
-      <path d="M5 19c8 0 8-14 16-14" />
+      <path d="M16 3h5v5" />
-      <path d="M14 5h7v7" />
+      <path d="M8 3H3v5" />
-      <path d="M5 5c5 0 7 3 9 7" />
+      <path d="m21 3-7.536 7.536A5 5 0 0 0 12 14.07V21" />
-      <path d="M14 12h5v-5" />
+      <path d="m3 3 7.536 7.536A5 5 0 0 1 12 14.07V15" />
     </svg>
   );
 }