Addresses the remaining round-4 codex findings (the `short_src`
byte-slice panic + the arc-handle reverse-iteration fixes already
landed via an earlier sweep).
- `cmd_set_ellipse_arc` clamps `sweep_angle` to ±360° — an API /
MCP sweep beyond a full turn just over-draws; it now persists a
sane single-revolution value.
- Path hit-test (`point_in_node`) follows the flattened, bezier-
aware outline instead of the bounding box: a curved or thin path
no longer selects empty bbox space, a zero-height stroked path
stays clickable, and a filled closed path is hittable across its
interior (new `point_in_polygon` even-odd test).
- The viewport-less `apply_release` now commits / clears
`path_anchor_drag` + `arc_handle_drag` (parity with
`apply_release_with_viewport`) so a drag can't leak across that
release path.
op-editor-core 242 / op-editor-ui 157 / op-host-native 21 tests green.
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