Add Nextcloud icon for GNOME Online Accounts

[christiansass]

Mint-Y theme missing Nextcloud icon for GNOME Online Accounts

Summary

The Mint-Y icon theme includes owncloud.png and goa-account-owncloud.png icons at all standard sizes, but has no corresponding nextcloud.png or goa-account-nextcloud.png icons.

As a result, when a Nextcloud account is configured in GNOME Online Accounts, the account entry in System Settings displays the OwnCloud logo instead of the Nextcloud logo.

Current behavior

The Nextcloud account in System Settings > Online Accounts shows the OwnCloud icon because Mint-Y only provides goa-account-owncloud.png — GNOME Online Accounts falls back to it as the closest match.

Expected behavior

The Nextcloud account should display the official Nextcloud logo, as it does in the Mint-X theme (which already includes nextcloud.png and goa-account-nextcloud.png at all sizes).

Notes

• The Mint-X theme already has the correct Nextcloud icons — only Mint-Y is affected.
• Nextcloud has been a separate project from OwnCloud since 2016.
• The Nextcloud logo is licensed under the Nextcloud Trademark Guidelines and is freely usable for identification purposes.
• Icons are needed at all sizes where goa-account-owncloud.png exists: 16, 22, 24, 32, 48, 64, 96, 256 (plus @2x variants).

Environment

• Linux Mint with Cinnamon desktop
• Mint-Y icon theme
• GNOME Online Accounts 3.50.x
• Nextcloud account configured via System Settings > Online Accounts