Fix traffic row highlight after closing details pane

[VickTor61]

Closes issue: #51

📜 Summary of changes:

• Fixed traffic table row highlight staying active after closing the request details pane.
• Lifted selected row state to TrafficTableV2/index.jsx.
• Passed selectedRowId down through GroupByNone, NetworkInspector, NetworkTable, and VirtualTableV2.
• Added onSelectedRowChange handler instead of passing the state setter directly.
• Updated VirtualTableV2 to use controlled row selection.
• Cleared the selected row id in handleClosePane, removing the blue highlight when the pane closes.

🎥 Demo Video:

Screen.Recording.2026-06-04.at.10.33.45.PM.mov

✅ Checklist:

• Make sure linting and unit tests pass.
• No install/build warnings introduced.
• Verified UI in browser.
• For UI changes, added/updated analytics events if applicable.
• For changes in extension's code, manually tested in Chrome and Firefox.
• Added/updated unit tests for this change.
• Raised pull request to update corresponding documentation if already exists.
• Added demo video showing the changes in action.

🧪 Test instructions:

1. Run the web app locally.

2. Run the Requestly desktop Electron app against the local web app.

3. Generate traffic through the Requestly proxy, for example:

   curl --proxy http://127.0.0.1:8281 http://example.com/

[CLAassistant]

All committers have signed the CLA.