When zones have Units='Percent' in the database but their Coords contain
pixel values (>100), ParsePercentagePolygon treats them as percentages,
causing wild scaling (e.g., 639% * 1920 / 100 = 12269) followed by
clamping to monitor bounds, producing degenerate full-frame zones.
Add a pre-check in Zone::Load that scans coordinate values before calling
ParsePercentagePolygon. If any value exceeds 100, log a warning and use
ParsePolygonString (pixel path) instead. Also add unit tests for both
ParsePolygonString and ParsePercentagePolygon.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
