added audio codec selector for bluetooth headphones

[temidaradev]

Pull Request

Motivation

This PR adds a Bluetooth codec selector to the Bluetooth panel using real, system-reported profiles instead of hardcoded/fake options.

Why this is needed:

• Users need a quick way to switch codec/profile (AAC/LDAC/etc.) per connected headset.
• Codec handling in bluetooth menu itself may be better than launching Blueman or using command line.

What this PR does:

• Adds codec selector UI for connected audio Bluetooth devices.
• Detects real profiles from PipeWire/Pulse stack (pw-cli/wpctl, fallback to pactl).
• Applies selected profile through backend commands.
• Improves switching reliability with pending/single-flight handling to prevent snap-back and double-click behavior.

Type of Change

Mark the relevant option with an "x".

• Bug fix
• New feature
• Breaking change
• Refactoring

Related Issue

• Closes #N/A

Testing

Describe how you tested your changes and mark the relevant items.

Manual validation performed:

• Verified profile discovery for WH-1000XM5 from live PipeWire data.

• Verified codec profile parsing returns real options (a2dp-sink-sbc, a2dp-sink-aac, a2dp-sink/LDAC description).

• Verified race-condition fixes (selection stability during async apply/query refresh).

• Tested on niri

• Tested on Hyprland

• Tested on sway

• Tested with different bar positions and density settings

• Tested at different interface scaling values

• Tested with multiple monitors (if applicable)

Screenshots / Videos

Bluetooth panel screenshot(s) attached in discussion showing connected WH-1000XM5 and codec-related UI flow.

Checklist

• Code follows project style guidelines
• Self-reviewed my code
• No new warnings or errors
• Documentation or comments updated (if relevant)

Additional Notes

• Backend preference is pactl when available; otherwise wpctl + pw-cli is used.
• Selector is shown only when real codec/profile options are discovered for the device.