Merge pull request #517 from aakhter/pr/grouped-vertical-rail

feat(tabs): grouped vertical rail from owner tab layouts

src/web/public/index.html

@@ -3829,6 +3829,8 @@
   <script defer src="terminal-keycode229-recovery.js"></script>
   <!-- Hardened markdown HTML sanitizer (wires DOMPurify). Must precede app.js. -->
   <script defer src="sanitize-html.js"></script>
+  <!-- Owner tab layout projection (grouped vertical rail); pure, read by app.js. -->
+  <script defer src="tab-layout-browser.js"></script>
   <script defer src="app.js"></script>
   <script defer src="tab-rail-resize.js"></script>
   <script defer src="terminal-ui.js"></script>