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.md

@@ -115,7 +115,7 @@ Per-component lines live in `tasks/`. Tags there:
 - [x] T31b Project · Issues and boards
 - [x] T31c Project · Plans
 - [x] T31d Project · Time and databases
-- [ ] T32a Canvas · Plane — `tasks/ch31-43.md`
+- [x] T32a Canvas · Plane — `tasks/ch31-43.md`
 - [ ] T32b Canvas · Tools
 - [ ] T32c Canvas · Panels
 - [ ] T32d Canvas · Graphs and boards
@@ -374,3 +374,4 @@ Per-component lines live in `tasks/`. Tags there:
 | T31d | 1 | FAIL | a focused segment past the strip's fold stayed hidden; the tracker lost focus as Start and Stop swapped; Stop and Skip went untested; percent did not refuse content |
 | T31d | 2 | PASS | |
 | T32a | 1 | FAIL | the plain wheel panned against every scroll box; the handlers panned from the render's viewport, so events within a frame overwrote each other; the fit's cap at one went untested |
+| T32a | 2 | PASS | |