Shape tools: review follow-ups (Shift, handle boundary, cursor order, feedback)

- The Selection tool takes a Shift-press on a selected object's centre point
  too: a Shift-drag moves the selection held to 45° steps, and a Shift-click
  there takes the object out of the selection, as a Shift-press on the object
  does.
- One rotate zone for the Selection tool and the shape tools
  (`select::rotate_zone`): a press on a bounding-box handle is not a turn, so
  the shape tools' zone matches the Selection tool's classification exactly.
- The shape tools' hover cursor follows the press order (corner and pie widgets,
  then the centre point, then the rotate zone), and a move of the selection
  shows the Selection tool's feedback: SelectionCopy with Alt, ArrowHollow while
  it snaps.
- Engine-level tests for the whole gesture (`crates/engine/src/tests/shapetools.rs`):
  repeated previews and one undo step, Alt copy, Escape then release, a turn
  about the centre, the corner widget still rounding, and an unfilled shape
  moved by the Selection tool.
- docs: evidence in target-app-parity.md's Shapes bullet and the M2 milestone,
  and the Move cursor's entry names the copy and snap cursors.

docs/roadmap.md

@@ -118,6 +118,7 @@ native wording review, layout checks and a web Devanagari font remain. [Notes](l
 |---|---|---|---|
 | M0 | Skeleton + vertical slice | ✅ done | — |
 | M1 | Selection, transform, layers, MCP (common command tools, strict keys, session resources and version-aware result hints) | ✅ mostly done (document-tab artwork drag with lossless resource transfer and one target Undo; malformed MCP app replies discard the connection without replay, #1761; bounded control socket waits and connection-slot recovery, #1726; bounded synthetic control input, #1709; no-op anchor Align keeps Undo, Redo and saved state (#1180 follow-up); transform reference point snaps to anchors/centres; rotated objects keep a rotated bounding box and their angle; Free Transform, Scale and Reflect along a rotated box pending; the Transform fields take one Tab each, the W/H link after them) | 4–6 |
+| M2 | Drawing tools + smart guides | ✅ mostly done (Polygon/Star exact-size count persistence, with repeated-drag, tool-switch and Cancel regression coverage; Curvature point markers without direction handles (#1236, in part); Direct Selection segment click/Delete preserves neighboring edges, #1278; Flare, Reshape, Live Corners widget dragging and per-corner radii and kinds landed, on any path's corners; Shaper rough-shape recognition and orientation steps, the remaining Pen modifier nuances; Shaper Groups with editable sources and separate fill/stroke edits landed; custom ruler origin with drag preview, active-artboard reset, relative X/Y fields and native round-trip (#1212); construction widget/refinements pending); a shape just drawn moves by its centre point and turns from the zone outside a corner with its tool still active (#5477); Tangent and straight-segment perpendicular snapping use saved Smart Guides Geometric Guides preferences and Control bar quick access (#2537); no View submenu | 12–18 |
 | M2 | Drawing tools + smart guides | ✅ mostly done (Polygon/Star exact-size count persistence, with repeated-drag, tool-switch and Cancel regression coverage; Curvature point markers without direction handles (#1236, in part); Direct Selection segment click/Delete preserves neighboring edges, #1278; Flare, Reshape, Live Corners widget dragging and per-corner radii and kinds landed, on any path's corners; Shaper rough-shape recognition and orientation steps, the remaining Pen modifier nuances; Shaper Groups with editable sources and separate fill/stroke edits landed; custom ruler origin with drag preview, active-artboard reset, relative X/Y fields and native round-trip (#1212); construction widget/refinements pending); Tangent and straight-segment perpendicular snapping use saved Smart Guides Geometric Guides preferences and Control bar quick access (#2537); no View submenu | 12–18 |
 | M3 | Paint & appearance (swatches, color, gradient, stroke, appearance, transparency, styles) | ✅ done (M3.7–M3.98): swatches, groups, libraries, tints, Lab spots and Registration; Eyedropper styles highlighted text only (atomic transparency rejection); Eyedropper reads visible locked and outside-isolation sources (#1251); Color Picker, Color panel, Color Guide, Color Themes, Edit Colors and Recolor Artwork (screen-bounded Edit chip list, #3416); gradients that follow every transform, the annotator, linked stops, freeform gradients, focal points, gradients on strokes and Expand; visible strokes when paint is added to inherited None/zero-width art (#1253); stroke geometry, arrowheads, dashes fitted to corners, stroke on type, width profiles and the Width tool (Shift-double-click enables adjoining adjustment in Width Point Edit; finite-arithmetic follow-up regressions and full CI passed ([Validation evidence](target-app-parity.md#evidence-what-ships-today-by-area))), Scale Strokes and preview bounds; Appearance targeting, container appearance, target circles, Expand Appearance; knockout, isolation, blend accuracy, CMYK blending, overprint, Attributes, masks and clipping, Flatten Transparency; graphic styles, links and libraries; CSS library export preserves fractional linear and radial gradient stop positions. Left: freeform gradients in SVG/PDF, mixed spot/process gradients in SVG and PDF gradients mixing a spot color with RGB or Lab stops export as stops or process colors; PDF export writes dithered gradient fills with spot stops, and Perceptual spot gradients with RGB or Lab stops other than white or more than 4,096 stops on their curve, as images in process colors; confirm the Scale Strokes & Effects default; Recolor model selection is available through the engine and MCP only (#2520); the dialog retains its existing controls | 4–8 |
 | M2 | Drawing tools + smart guides | ✅ mostly done (Curvature point markers without direction handles (#1236, in part); Direct Selection segment click/Delete preserves neighboring edges, #1278; Flare, Reshape, Live Corners widget dragging and per-corner radii and kinds landed, on any path's corners; Shaper rough-shape recognition and orientation steps, the remaining Pen modifier nuances; Shaper Groups with editable sources and separate fill/stroke edits landed; custom ruler origin with drag preview, active-artboard reset, relative X/Y fields and native round-trip (#1212); construction widget/refinements pending) | 12–18 |