Subtitle: small minds → small models

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/shell/nav.json

@@ -1,6 +1,6 @@
 {
   "_doc": "Shared navigation IR — ONE source for both the React app (src/layout/Sidebar.jsx) and the Gradio Space (tiny-army app.py build_sidebar). Each item carries routing for both hosts: `href` + `view`/`page` drive React's hash router and active state; `space` is the Gradio tab label the item navigates to. React renders items with an `href`; the Space renders items with a `space`. `brand` is used by the Space only (React uses config.name).",
-  "brand": { "title": "Tiny Army", "icon": "⚔️", "subtitle": "small minds, big dreams" },
+  "brand": { "title": "Tiny Army", "icon": "⚔️", "subtitle": "small models, big dreams" },
   "sections": [
     {
       "title": "World",