* fix: select top-level auto layout frames by their empty area
Checked against Figma desktop 126 with real pointer input. The gaps and
padding of a top-level frame with auto layout (any direction or grid,
filled or not, on the page or in a section) select, highlight, and drag
the frame, while clicks on its layers still select those layers. A plain
top-level frame's empty area stays background, as #900 recorded; its
oracle scenarios only used frames without auto layout.
Auto layout frames are hit by their bounds even without a fill, and a
press on such a frame's empty area no longer starts a marquee.
* feat(canvas): outline auto layout children with dotted lines, as in Figma
Hovering a horizontal or vertical auto layout frame outlines its visible
direct children, and a single selected layer dots the border of its auto
layout parent, in the container's outline color. Grid and plain frames,
grandchildren, and multi-selections show none. Line weight and dash were
measured from Figma 126 screenshots: 1 px with 1.75 px dashes and 1.25 px
gaps in screen space.
The editor gains a transforming flag that canvas input sets while layers
move, resize, or rotate; the outlines and the padding and gap markers of a
selected auto layout frame hide while it is set, as Figma's do.
The children outline a selected auto layout frame drew under the pointer
now uses the same stroke, and the dash effect is freed after each draw.
* fix(canvas): select unfilled frames by their empty area only on a click
Live Figma 126, with real pointer input on a top-level card holding an
unfilled auto layout row and an unfilled plain frame, with and without
auto layout on the card: a click on either frame's empty area selects
that frame, while a ⌘-click looks through it to the card.
Only top-level auto layout frames now own their empty area in hit
testing, so a deep hit no longer stops at a nested unfilled auto layout
frame. A click that ends on an open container selects the frame child
under the point by its bounds, filled or not, which plain frames did not
get before; boards that open by themselves keep their empty area as
background.
* fix(canvas): select an empty unfilled frame on the page by its bounds
Live Figma 126: a click inside an empty frame without a fill selects it,
on the page and in a section. The section case already did after the
previous commit; on the page the click found nothing, since an unfilled
frame without children is not hit. A click that hits nothing now looks
for a frame under the point among the scope's children, which skips
boards that hold layers, as their empty area stays background.
* refactor(scene-graph): read the containers the selection opens in their own helper
* fix(canvas): open a selected container, so repeated clicks reach deeper layers
In Figma, clicking again at the same point inside a selected frame,
component, or instance selects the layer under the pointer, so repeated
clicks walk down to a text in a nested component such as shadcn's
calendar. The click hit test opened only the ancestors of the selection,
so a selected nested container stopped the walk at itself and only a
double-click went deeper.
A selected container with layers now opens like its ancestors; groups
and booleans stay closed, as in Figma. Pressing inside the selection
still drags it, and its empty area keeps it selected.
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