Picking the two points of a Linear dimension snapped to anchors and to the
line under the pointer, but showed no guides and ignored the art around it.
The picks now go through the drawing tools' Smart Guides (DrawSnap), hovering
too, so the guides show before each click: a point slides into line with other
objects' anchors and centres, and the second onto the construction guides
through the first. An anchor of the line under the pointer still wins (it
links the dimension to that path), then a guide, then the closest point of the
line (#2432). The guides go once the dimension is being placed.
Test: linear_picks_show_and_snap_to_smart_guides (fails on the old tool, which
showed no overlays while hovering). docs/dimensions.md updated.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Drag out from a segment, corner, circle or arc to place a dimension; plain clicks pick two points or two lines. Radial dimensions on perfect arcs, picas, Away/Between and Left/Center/Right text placement. The Properties panel edits a selected dimension, with Apply to All (dimension.applyToAll) and Set as Default. Dimension Selected Paths, the Arc/R/Ø prefixes and the custom defaults are left out. The refresh returns at once in documents without dimensions (Document::dimensions); a linked dimension moved on its own keeps its place; modes, units, line types, arrows and text placement are enums; the tool has its own icon.
