Fix controls disappearing after dragging a window to another monitor

[Qurtison]

Problem

After dragging a window to another monitor with the top-edge strip (or SUPER + drag), the minimize, maximize and close buttons disappear.

The drag controller moves windows with hl.dsp.window.move({ x, y, relative = false }). That changes the window's position but not the monitor or workspace Hyprland files it under. So once the drag ends, win.monitor still names the old monitor, and winMonitor falls back to it. The old monitor's overlay keeps hosting the controls at coordinates outside its own screen, so they can't be seen.

Reproduced on Hyprland 0.56.2 with two monitors (DP-1 3440×1440 at 0,0 and DP-2 1920×1080 at 3440,0): a floating window moved to x=4000 still reported monitor: DP-1, workspace: 1.

Fix

• src/lua/mousefirst.lua: new MOUSE_FIRST.adopt(address, x, y, w, h). It finds the monitor under the window's top-center point, using the same logical size calculation as monitor_state. If that differs from the window's current monitor, it moves the window to that monitor's active workspace (follow = true) and re-applies the final size and position, because the workspace move shifts floating windows on its own.
• src/js/hypr.js: evalAdopt() builder.
• src/DragController.qml: _finish() calls it after the final move or snap. Both overlay drags and handed-over native drags go through this path.

It does nothing when the window stays on the same monitor.

Testing

• node --test tests/*.test.mjs: 18/18 pass.
• Moved a floating window to DP-2 coordinates and called MOUSE_FIRST.adopt. Afterwards Hyprland reported monitor: DP-2, workspace: 2 at the same position, and mousefirst status showed the active window on DP-2.

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