[Feature][Mobile] Add a Web search action when selecting text in chat messages

Description

When selecting text in a chat message in the T3 Code mobile app (Android, Play Store 1.1.0), the selection menu has no way to search the selected text on the web. Other apps (e.g. Chrome, most messaging apps) offer a "Web search" / "Search" action in the text selection toolbar, which makes it quick to look up product names, terms, or errors mentioned in an assistant response.

Android chat markdown uses a custom selectable renderer (#8779, SelectableMarkdownText.android.tsx / @t3tools/mobile-markdown-text), which may be why the system "Web search" action isn't shown.

Expected behavior

• Selecting text in a chat message shows a Web search (or Search) action alongside Copy / Select all.
• Tapping it opens the user's default browser/search app with the selected text as the query (e.g. Android Intent.ACTION_WEB_SEARCH, or a search URL fallback).
• Ideally the same on iOS (the system "Search Web" / "Look Up" items).

Related

• #5342 — native text selection within assistant responses (closed)
• #6456 — reply to selected assistant response text (closed)
• #8779 — Android selectable markdown

Start with SelectableMarkdownText.android.tsx and the @t3tools/mobile-markdown-text integration, then trace how text-selection actions are exposed on Android. Check whether the existing native selection behavior can provide a Web search action, and review the corresponding iOS path if present. Done means selected chat text offers Search/Web search and opens the default browser or search app with that text as the query.