## Summary
- When clicking the refresh button in the preview panel, the app now
preserves the current route instead of defaulting to the root path (/)
- Store the current URL in a ref when refresh is clicked, then use it as
the iframe src during reload
- Added E2E test to verify route preservation on refresh

Fixes #253

## Test plan
- E2E test `refresh preserves current route` verifies the fix:
  1. Create an app
2. Navigate to a different route using JavaScript (simulating
client-side navigation)
  3. Click refresh
  4. Verify the address bar still shows the navigated route (not /)
- Existing `refresh app` test continues to pass

🤖 Generated with [Claude Code](https://claude.com/claude-code)
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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Ensures the preview iframe keeps the current client-side route on
refresh and after HMR remounts.
> 
> - Track route changes (`pushState`/`replaceState`) and persist per-app
URL via `previewCurrentUrlAtom`; initialize navigation from preserved
URL
> - Use `currentIframeUrlRef` and validated same-origin URL as iframe
`src` on reload; reset history on app change
> - Update `PreviewIframe` navigation history, address bar
(`data-testid="preview-address-bar-path"`), and reload logic; avoid
unintended src resets on re-render
> - Add E2E test `refresh preserves current route` with a multi-page
React Router fixture to verify behavior
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
d715ec38b8fb94383eafe3a31b901d407468ab4e. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Refresh in the preview panel now preserves the current route instead of
resetting to /. Routes are also restored after HMR remounts; adds an E2E
test to confirm this; fixes #253.

- **Bug Fixes**
- Track route changes (pushState/replaceState) and persist the current
URL per app via previewCurrentUrlAtom; on reload, validate same-origin
and use it as the iframe src; reset on app change.
- Add a data-testid to the address bar and a Playwright test that
navigates via a react-router link in a multi-page app, refreshes, waits,
and asserts the route remains.

<sup>Written for commit d715ec38b8fb94383eafe3a31b901d407468ab4e.
Summary will update on new commits.</sup>

<!-- End of auto-generated description by cubic. -->

---------
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>