Show UPower device batteries in Bluetooth panel

[erbmicha]

What changed

• Fall back to UPower when a connected Bluetooth device does not expose BlueZ Battery1 data.
• Match UPower HID batteries to Bluetooth devices by normalized address.
• Keep native BlueZ battery readings as the preferred source.
• Add focused model tests for fallback matching, source precedence, mismatches, and unready devices.

Testing

• bash test/shell.d/bluetooth-test.sh
• ./test/shell reached 180 of 184 passing test files. Three failures require the absent omarchy-pkgs checkout. The unrelated network-qr-test.sh passed when rerun alone.
• Loaded the exact source files in the running Omarchy Bluetooth widget and visually confirmed the Apple keyboard battery displays as 3% beneath the device name without clipping or layout changes.

[Copilot]

Pull request overview

Adds UPower battery fallback support to the Bluetooth panel while preserving native BlueZ readings.

Changes:

• Matches UPower HID batteries by normalized Bluetooth address.
• Displays fallback battery percentages for connected devices.
• Adds focused tests for matching, precedence, and invalid devices.

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Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
shell/plugins/panels/bluetooth/Model.js	Resolves battery percentages from BlueZ or matching UPower devices.
shell/plugins/panels/bluetooth/Panel.qml	Supplies UPower devices and renders resolved percentages.
test/shell.d/bluetooth-test.sh	Tests fallback matching and source precedence.

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