When a user visits a direct video link (e.g. `/?v=...`) while logged in,
the application auto-authenticates and redirects the view to `#view=for-you`.
Previously, `setHashView` unconditionally removed all query parameters, causing
the video modal to fail to open because the `v` parameter was lost before it could be read.
This change:
1. Updates `setHashView` to accept an options object, allowing specific parameters to be preserved.
2. Updates `handleAuthLogin` in `app.js` to detect if a `v` parameter is present and request its preservation during the view switch.
google-labs-jules[bot]