Fix recording indicator not being detected after YellowDot startup on macOS 15.7.7

[InvWorld]

Summary

This PR fixes an issue on macOS 15.7.7 where the screen recording indicator is not hidden if it appears after YellowDot has already started.

Problem

On macOS 15.7.7, YellowDot only works reliably if the recording indicator is already visible when the application launches.

Reproduction steps:

1. Launch YellowDot.
2. Start a screen recording.
3. The purple recording indicator remains visible.
4. Change the dot color setting manually.
5. The indicator is immediately detected and hidden.

Interestingly, if YellowDot is launched while the recording indicator is already present, the indicator is hidden correctly.

Cause

The application was operating on previously discovered window information instead of always querying the current WindowServer state.

As a result, indicator windows that appeared after YellowDot startup were not always detected automatically.

Solution

• Query the current window list whenever brightness adjustments are applied.
• Remove dependence on stale window information.
• Enumerate all relevant windows when performing detection.

Result

Recording indicators that appear after YellowDot has already started are now detected and hidden automatically without requiring any manual interaction.

Tested

• macOS 15.7.7
• YellowDot started before screen recording
• YellowDot started after screen recording
• Manual color switching no longer required