Canvas · Tools: select, move and snap, resize, draw, pen, text, brush

ToolLayer lies over an InfiniteCanvas and carries its tools. Select
takes the topmost shape a press reaches, Shift adds or drops one, a
drag moves the selection and snaps its nearest edge or middle to
another shape's within reach, a handle resizes it, Shift keeping a
corner's shape, and a drag on empty space draws a SelectionBox that
takes what lies wholly inside. The shape tools draw by a drag toward
any corner, Shift keeping them square; the pen adds a point per press
and a double press ends the path; text drops a line where pressed; the
brush strokes a path its width. A drag may end in the layer or out of
it; each gesture ends once and asks the owner. SelectionBox,
TransformHandles and SnapIndicator draw the marks.

ToolPalette picks a tool from icons named in tips; BrushSettings sets a
brush's width and hue; HistoryPanel lists the steps done, the undone
ones quiet, and takes the drawing to a step on Enter or a double press.

The model changes: lines and arrows end at a named corner, so they run
either way, and paths carry their width. Three Lucide icons: hexagon,
slash and move-up-right.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tasks/ch31-43.md

@@ -44,15 +44,15 @@
 
 ## T32b Canvas · Tools
 
-- [ ] SelectionBox
-- [ ] TransformHandles
-- [ ] SnapIndicator
-- [ ] ToolPalette
-- [ ] ShapeTools — rect, ellipse, polygon, line, arrow
-- [ ] PenTool / PathEditor
-- [ ] TextTool
-- [ ] BrushTool / BrushSettings
-- [ ] HistoryPanel
+- [x] SelectionBox
+- [x] TransformHandles
+- [x] SnapIndicator
+- [x] ToolPalette
+- [x] ShapeTools — rect, ellipse, polygon, line, arrow
+- [x] PenTool / PathEditor
+- [x] TextTool
+- [x] BrushTool / BrushSettings
+- [x] HistoryPanel
 
 ## T32c Canvas · Panels