nexus: add cursor theme selector to wallpaper & style page

[vitormarquesgithub]

What this adds

• A cursor theme selector and size selector directly in the Wallpaper & style page, replacing the previous separate sub-page approach
• Discovers all cursor themes installed in /usr/share/icons, ~/.local/share/icons and ~/.icons
• Highlights the currently active theme/size with a check mark in the popup list, and scrolls to it automatically on open
• Applies theme and size immediately via hyprctl setcursor
• Persists selection to gsettings and to $cursorTheme / $cursorSize in the Hyprland variables config
• PopupRow gained a popupIcon prop so each row can set a distinct icon for its trigger button, independent of the row's leading icon

Notes

• Assumes cursor variables are stored as $cursorTheme and $cursorSize in the Hyprland variables config
• Theme list is populated lazily on page open, not at shell startup

Demo

2026-07-01.04-50-18.mp4

[PixelKhaos]

This might be something to hold off on a bit, as I think instead of adding too many toplevel options there, might be a subpage of "colours and style" where this functionality can sit as a single dropdown selector.

[soramanew]

This definitely shouldn't be a separate page there. Perhaps a dropdown input like the default apps options, or a separate page if we add more related options. I'm holding back on this for now, we can decide where to add it when we have more related options.

[vitormarquesgithub]

This might be something to hold off on a bit, as I think instead of adding too many toplevel options there, might be a subpage of "colours and style" where this functionality can sit as a single dropdown selector.

I've since reworked it, the cursor theme and size selection are now inline dropdowns directly in the Wallpaper & style page, no separate subpage. Happy to adjust placement further once there's a clearer direction.

[vitormarquesgithub]

This definitely shouldn't be a separate page there. Perhaps a dropdown input like the default apps options, or a separate page if we add more related options. I'm holding back on this for now, we can decide where to add it when we have more related options.

Understood, I'll wait for your call on placement. The current implementation already uses a dropdown inline in the Wallpaper & style page, similar to the default apps approach. Ready to rework whenever you decide on the final structure.

[soramanew]

Please use the PopupRow component instead of modifying the Menu component. Menus are not scrollable, the PopupRow is there specifically for this purpose

[vitormarquesgithub]

Hey @soramanew, thanks for the feedback!
I've reverted Menu.qml back to its original state and replaced the theme/size selectors with CursorThemeRow/CursorSizeRow, which extend PopupRow and use a VerticalFadeListView inside the popup content — same scrollable pattern used elsewhere. Both rows also scroll to the currently active theme/size on open.
As part of this I added a popupIcon prop to PopupRow (wired to BlobPopup's existing icon alias) so each row can set its own trigger icon instead of the hardcoded view_apps default — happy to revert that part if you'd rather keep PopupRow's API untouched.
I've also updated the PR description to reflect the current implementation.
Also wanted to say thanks for the guidance and patience — I'm still fairly new to this stack and to the codebase, so pointers like this really help. I'll keep digging into the architecture so I can contribute better on future PRs.