Fix full-screen logo hiding on notched displays (detect via Spaces API)

[jeffscottmtl]

Summary

On notched MacBooks (Sequoia/Tahoe) the logo did not hide when an app entered native full screen, and once hidden it could stay stuck until the app was relaunched. This fixes both, for any app, on any display.

Root cause

The old getFullScreens() recognised full screen by matching window bounds against the screen frame (windowRect.equalTo(screen.frame)). On notched displays that can never be made to work, because a native full-screen window and a merely maximized (green-zoom) window report identical bounds, both rendering below the notch.

Verified live on macOS 26 with a built-in notched display:

window	reported bounds
maximized Chrome (menu bar visible)	(0, 34, 1710, 1073)
full-screen Chrome	(0, 34, 1710, 1073)

There is also no persistent full-screen-sized window to key off (only a 1-frame flicker during the transition). So any geometry-based rule must pick one horn of a dilemma: either miss full screen (logo never hides) or fire on maximized windows (logo hides when it shouldn't, and gets "stuck" because a maximized window is usually present after exiting).

Fix

Ask the window server directly instead of guessing from rectangles. The CoreGraphics Spaces API (CGSCopyManagedDisplaySpaces) reports each display's current Space type; a native full-screen Space is type == 4. We collect the displays currently in a full-screen Space and map them back to NSScreen frames by display UUID.

This is:

• app-agnostic (works for any app, not specific window shapes),
• per-display (correct on multi-monitor setups), and
• immediate on exit (the Space type flips back to normal the instant full screen ends, so the logo reappears with no stuck state).

Verified across repeated enter/exit cycles on the built-in notched display: FULLSCREEN -> normal -> FULLSCREEN -> normal, logo hides/reappears correctly each time, and stays visible for maximized windows.

Also removes the now-dead isFullScreenWindow() and getOwner() helpers.

Notes

• This uses a private CoreGraphics API. That is consistent with the existing use of the private CGWindowList API in this file, and Logoer ships outside the App Store. If CGSCopyManagedDisplaySpaces ever returns nothing on a future OS, the code degrades gracefully (logo simply stays visible).
• Apps using non-native full screen (e.g. iTerm2's "non-native full screen windows" option) do not create a full-screen Space and are intentionally not matched, since such windows are geometrically indistinguishable from a maximized window.

Closes #29
Closes #30