This removes some longstanding Safari iOS positioning hacks and refactors the mobile positioning strategy across Safari, Chrome and Firefox. See PR descriptions for more details.
Co-authored-by: Joffrey JAFFEUX <j.jaffeux@gmail.com>
* UX: increase button sizes and timeline size
* UX: bring back tracking btn on topic timeline desktop
* Scope flexing topic-navigation area to mobile + make all buttons same font-size
