V102 FAULT-PLANE DEPTH ORIENTATION FIX

Base
- Built from V101.

What changed
- The right-side interpolated fault-plane panel is now explicitly depth-oriented.
- The code checks the stored patch depth_km values and flips the down-dip axis if necessary.
- Top of the right panel = shallow / up-dip.
- Bottom of the right panel = deep / down-dip.
- Labels were changed from the ambiguous single "Down dip" label to "Shallow / up-dip" and "Deep / down-dip" with a downward arrow.
