PowerPulse: add new desklet

[vicman]

Summary

• Add PowerPulse (powerpulse@vicman.app), a compact Cinnamon desklet that monitors wireless device batteries using UPower (D-Bus) and optional HeadsetControl.
• Shows laptop, mouse, keyboard, headset, speakers and any other UPower device that reports a battery percentage.
• Includes settings, expandable device cards, notifications, and ES/EN translations.

Homepage: https://github.com/vicman/PowerPulse
Contact: powerpulse@vicman.app

Test plan

• ./validate-spice powerpulse@vicman.app passes
• Install from Spices / local copy and add the desklet on Cinnamon 6.x
• Confirm UPower devices appear and HeadsetControl headset is optional
• Confirm settings persist and desklet removes cleanly

[github-actions]

Best-practices scanner

This is a regex-based check for API usage that can pose security, performance or
maintainability issues, or that may already be provided by Cinnamon. Most findings
are advisory and do not automatically disqualify a pull request.

This check is not perfect and will not replace a normal review.

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Found 1 potential issue(s):

⚠️ WARNING

⚠️ sync_file_test

powerpulse@vicman.app/files/powerpulse@vicman.app/providers/headsetControlProvider.js:52

this._available = GLib.file_test(this._command, GLib.FileTest.IS_EXECUTABLE);

file_test() is a synchronous stat call that can block on slow/network filesystems.
Prefer attempting the operation and handling a Gio.IOErrorEnum.NOT_FOUND error instead.

---

Automated pattern check.

[github-actions]

Best-practices scanner

This is a regex-based check for API usage that can pose security, performance or
maintainability issues, or that may already be provided by Cinnamon. Most findings
are advisory and do not automatically disqualify a pull request.

This check is not perfect and will not replace a normal review.

---

Found 1 potential issue(s):

⚠️ WARNING

⚠️ sync_file_test

powerpulse@vicman.app/files/powerpulse@vicman.app/providers/headsetControlProvider.js:52

// Avoid GLib.file_test(); absolute paths are confirmed by spawn in fetch().

file_test() is a synchronous stat call that can block on slow/network filesystems.
Prefer attempting the operation and handling a Gio.IOErrorEnum.NOT_FOUND error instead.

---

Automated pattern check.