Introduce a cinematic capture animation when a unit captures a property:
a small window shows the capturing unit hopping atop the building, which
then squishes down to reflect remaining capture points (or pops back up
in the new owner's color if the capture completes).
- Add AdvanceWarsCaptureAnim.js with the full cut-in animation sequence
- Display remaining capture-points as a strength number on partially-
captured buildings, tinted toward the owner's color
- Add `before` field to capturing events so the animation knows the
starting HP
- Support partial unit sync so units are revealed action-by-action
during turn replay instead of snapping to end-of-turn positions
- Add depth bias so units always render above buildings on the same tile
