The Stroke panel weight dropdown converted one pt-based preset list into
whatever Units > Stroke was set to, which produced ugly rounded values like
0.088 mm, 0.265 mm, 10.583 mm from the pt ladder. Each unit now has its own
native ladder (observed from Illustrator's running dropdowns and typed in),
converted to pt once at use. Points, Millimeters, Centimeters, Inches,
Pixels and Picas each get Illustrator's actual values; the exotic Unit
variants (Feet & Inches, Meters, Yards, Feet) fall back to the pt ladder.
Picas round-trip to exact pt weights (1 pt, 12 pt, 60 pt …) but display as
decimal picas until Unit::number learns 0p1 / 1p3 notation; that is a
system-wide formatter change left for a separate PR.
Also bumps Unit::number precision from 3 to 4 decimals so Illustrator's
sub-eighth-inch strokes (0.0078, 0.0156, 0.0313, 0.0625 in) show their
authored values instead of rounding to 0.008 / 0.016 / 0.031 / 0.063.
Trailing zeros are still trimmed, so 1 pt stays "1".
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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