fix: show active speaker in full screen when no participant is selected

Maximilian Fußrequested to merge
m.fuss/web-app:126-fullscreen-mode-has-no-active-speaker-view into main

As well as fixing the issue of updating the focused participant to the latest speaker, this MR also (re-)introduced pinning for the full-screen view.

If a user activates full-screen mode by clicking the button on a grid tile, the selected participant will be pinned by default.

Bildschirmfoto_2025-08-12_um_16.18.05

Closes https://git.opentalk.dev/opentalk/frontend/web/web-app/-/issues/2719

Edited by Maximilian Fuß

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