Re-hover edit handles after the edit annotation is rebuilt under the cursor

[mattdawkins]

• After dragging a line/polygon vertex, the handle could not be grabbed again until the mouse left it and came back.
• A follow-up store update (e.g. userModified, stereo length write-back) rebuilds the edit annotation; GeoJS only fires mouseon when the hovered handle index changes, so the new handle under a stationary cursor never re-selects.
• After a rebuild in edit mode, clear the handle features' stale hover state and replay the mouse position.

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