Yetu Radio player rebuilt around listening, not decoration

The Yetu Radio player was overhauled to behave like a real listening tool instead of a static media block.

We added favorite-state persistence through local storage, share actions that can use the Web Share API when available, and clearer “now playing” messaging tied to the time of day.

We also tightened the mobile layout, simplified the status indicators, and made the frequency and coverage details easier to scan on smaller screens.