What changed

Four fixes to the AirPods device settings screen, all based on feedback from a LibrePods developer review:

• Other connected devices list now shows the correct MAC address. The bytes were displayed in reverse order, so the address shown didn't match what you'd see in your phone's Bluetooth settings.
• "Volume Swipe Length" is now called "Volume Swipe Wait Time", with a description that actually explains what it does: the setting controls how long to wait between swipes to prevent unintended volume changes, not the swipe distance.
• Removed the "Charging Sounds" toggle. The setting didn't actually control the case charging sound (that's handled elsewhere on the AirPods), and the real effect is unknown, so it's better to not expose a toggle we can't make any promises about.
• Fixed End Call / Mute Mic radio buttons. Rapid taps could misbehave, selecting the already-selected option would still fire commands to the AirPods, and screen readers didn't announce the two options as a radio group.

Technical Context

• MAC byte order: The 0x2E and 0x0E decode paths applied a byte reversal that looked correct at first glance but didn't match what the device actually sends. Verified against LibrePods. Added regression tests: a cross-path test that asserts ConnectedDevices and AudioSource decode the same bytes to the same string (the screen relies on audioSource.sourceMac == device.mac), plus a high-byte test (AA:BB:CC:DD:EE:FF) to lock in %02X upper-case formatting and catch any future sign-extension regression.
• In-case tone: The decode path is kept internally. Dropping it would cause the device's periodic 0x31 frames to hit the "Unhandled message" log branch and skip the lastMessageAt refresh — that timestamp feeds AAP freshness / signal-strength boost logic, so losing the update would visibly degrade signal indicators. An explanatory comment above SETTING_IN_CASE_TONE documents this so a future cleanup doesn't re-remove it.
• Radio buttons: The root cause was two overlapping click handlers on one row (Row.clickable + RadioButton.onClick). Replaced with the Material 3 idiomatic pattern — a single Modifier.selectable on the Row with role = Role.RadioButton, and RadioButton.onClick = null. An if (!selected) onClick() guard prevents redundant commands when the user hammers the already-selected option. Options are now wrapped in Column(Modifier.selectableGroup()) so TalkBack announces them as a mutually exclusive set. Transport-level dedupe was considered and rejected as inconsistent with the rest of the AAP send path and unnecessary once the UI bug is fixed.