Context: #1782 points people to the LumaGlass fork (likaia/MonitorControl) as a possible workaround for the missing Tahoe OSD slider. That issue is now locked and likaia's repo has Issues/Discussions disabled, so posting here instead.

Looked into LumaGlass as a candidate fix. Found a problem: MonitorControl/Support/BrightnessHUDController.swift is referenced in project.pbxproj (Sources build phase, AB10C000.../AB10C001...) but the file itself doesn't exist in any commit on any branch of that repo:

git log --all --diff-filter=A --name-only | grep -i hud
→ only CUSTOM_BRIGHTNESS_HUD_PLAN.md, no .swift file

Likely cause: the fork's .gitignore contains a large templated block (looks like a Jenkins-home template) with a root-level blanket /* ignore + whitelist exceptions, around line ~4670. It appears to silently match and exclude this new root-level Swift file:

git check-ignore -v MonitorControl/Support/BrightnessHUDController.swift
→ .gitignore:4670:/*    MonitorControl/Support/BrightnessHUDController.swift

Impact:

• The fork doesn't build from source as committed (missing-file compile error).
• The actual implementation of the macOS 26 HUD fix — the fork's main feature — isn't in the public source, only in the prebuilt DMG/ZIP release assets linked from the GitHub release. Can't be reviewed/audited from the repo alone.

Rest of the diff against upstream (MenuHandler/SliderHandler UI rewrite, Sparkle feed repoint, MediaKeyTap dependency swap) checked out fine — no risky APIs, no entitlement changes, dependency fork is byte-identical to MonitorControl's own MediaKeyTap fork. This missing file is the one open concern.

@likaia — flagging in case you want to fix the .gitignore/commit the missing file. Mainly posting here for visibility since the fork's own issue tracker is closed and #1782 is locked.