CarPlay indicator sync, lock screen fix, new app icon, release automation

[fethica]

Changes

• CarPlay: now-playing indicators in the station list update when the station changes from outside CarPlay (phone UI, lock screen, next/previous)
• Lock screen: now-playing info refreshes when the player finishes loading, so duration is accurate and the live indicator no longer sticks when switching from a live stream to an MP3
• App icon: new waveform design, matching the Android version
• Loader logo: same new artwork, so the loading screen matches the icon
• Release automation: pushing a tag like v3.1.0 builds an unsigned .ipa for sideloading and creates a GitHub release with generated notes

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