adk web: Links in chat responses should open in a new tab
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Descripción
### Description
When the agent responds with a URL in `adk web`, clicking it navigates away
from the chat — the user loses their conversation. Links rendered in chat
messages should open in a new browser tab.
### Steps to reproduce
1. `adk web --reload_agents`
2. Ask the agent a question that produces a response containing a URL
3. Click the link in the rendered chat message
4. The browser navigates away from the ADK web UI — the conversation is lost
### Expected behavior
External links (`http://…` / `https://…`) in chat responses should open in a
new tab (`target="_blank"`) with `rel="noopener noreferrer"`.
### Suggested fix
In the Angular web UI component that renders chat messages, add
`target="_blank"` and `rel="noopener noreferrer"` to auto-linked URLs.
For example, if links are rendered via Angular's markdown/HTML binding, a
directive or pipe could post-process `` elements:
```ts
// Wherever chat message HTML is rendered:
// Add target="_blank" rel="noopener noreferrer" to external tags
Workaround
We're currently injecting a MutationObserver script into
google/adk/cli/browser/index.html post-install that patches links as they
appear in the DOM. This works but has to be re-applied after every
pip install.
Environment
- adk-python version: latest (pip)
- Browser: Chrome / Safari / Firefox (all affected)
- OS: macOS / Linux
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