fix(linux-rust): Clear stale tray battery on device switch

[Ryder-C]

Problem

When switching from Airpods Max to Airpods (or vice versa), the tray displays battery data from the previous device. Airpods populates battery_l, battery_r, battery_c while Airpods Max populates battery_headphone, the old fields are never cleared so the tray icon doesn't update.

Fix

Reset all battery fields to None when a new device connects, so only the active device's data is shown.

[coderabbitai]

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