Fix grid layout workspace ID mismatch with split-monitor-workspaces

[stsolovey]

Fixes #86

The grid layout uses formula-based workspace ID calculation which doesn't work correctly with split-monitor-workspaces or hyprsplit plugins.

This PR rewrites build_overview_layout() to query actual workspaces from the monitor via getWorkspacesCopy() instead of calculating IDs.

Changes:

• Query workspaces filtered by current monitor
• Add virtual workspace IDs for empty grid cells
• Remove side effects (rawMonitorFocus, moveWorkspaceToMonitor)
• Add .count() guards for safe map access

Also includes Hyprland 0.53 compatibility from #89.

[Schlafhase]

This looks promising! Could you explain how exactly the build_overview_layout function works now? Also I think this repo might be abandoned considering that the last commit was 1 month ago and it didn't update to 0.53. Do you want to help me maintain my fork?

[raybbian]

Thank you for the PR! Unfortunately, this doesn't allow you to place windows on arbitrary workspaces - you can't place a window on the center workspace for example (that workspace then becomes the first workspace for the monitor).

Ultimately I'd like a way for workspaces to remember which location they were on (This would enable a new layout)

[stsolovey]

@raybbian Makes sense. Thanks for the feedback. I've switched to GNOME for now and can't actively test on Hyprland. Feel free to merge or close as you see fit.

[stsolovey]

@Schlafhase The new approach queries actual workspaces via getWorkspacesCopy() instead of calculating IDs by formula. This makes it compatible with split-monitor-workspaces.

Re: fork collaboration — I've switched to GNOME for now, so can't commit to active maintenance. But thanks for the offer.