Drawn arrows become connections (FL-94)

[raj-khan]

FL-94, and FL-95 added to the backlog.

With the pen and Auto shapes on:

• A line or arrow drawn from one shape to another becomes a connection in the drawn direction; heads at both ends make it two-way. The shapes are pinned where they are, so nothing moves.
• An arrow from a shape into open canvas (or from open canvas into a shape) adds a shape of the same kind at the open end, connected, with its title ready to type.
• One that touches no shape (frames and strokes never count as ends) becomes a straight stroke that keeps a clean arrowhead, written in .flow as id arrow: end or both and drawn in SVG too.
• Each is one undoable change, with Keep as drawn in the toast.

FL-95 (new, from feedback): an empty diagram should be a blank canvas you can draw on, not a list of samples.

Tests: 340 unit, all e2e passing except quick.spec.js Ctrl+K, which is a pre-existing local flake under full-suite load (it fails the same way on main and passes alone and in CI).

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