feat(viewer2d): make the lineweight display scale adjustable from the toolbar

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The px-per-mm mapping was a hard-coded guess twice over, and the right
value depends on the monitor - AutoCAD has the same knob as the Adjust
Display Scale slider. Expose it: a slider plus a number box next to the
lineweight toggle, with a readout of what the drawing's own weights come
out to (0.35mm -> 7px, 0.50mm -> 10px at the 20 px/mm default). The
value persists in localStorage.

Retuning applies to the live materials instead of rebuilding the scene.
The hairline cut-off is a millimetre value, so changing the scale moves
every weight by the same factor without changing which bucket a segment
belongs to - each fat batch now remembers its weight in mm, and only
material.linewidth is rewritten. That keeps a drag on the slider instant
even on the 37 MB road drawing.

Measured headless on its 0.35mm gutter line: 2-3px at scale 8, 7px at
20, 14px at 40 - matching the readout in each case.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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minsung

2026-08-05 08:47:59 +09:00

co-authored by Claude Opus 5

parent cf1298749b

commit a924b1ec34

6 changed files with 6086 additions and 9 deletions

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