V122 QUICK FF DEPTH ORIENTATION / AUTO DELAY / SLIP TOOLS

Base:
- Built from v121.

New quick finite-fault editor controls:
- Row1 shallow/deep toggle
  * Row1: shallow = top row is up-dip / shallower.
  * Row1: deep = top row is down-dip / deeper.
  * This flips the row-to-depth direction without changing the visual 5x5 workflow.

- Auto delay from 0
  * Finds an active zero-delay cell and treats it as the rupture/epicenter cell.
  * Uses patch-center distance and the current rupture velocity to fill delay_s for all active cells.

- Slip % of focused + Apply slip %
  * Click/focus a visible cell.
  * Enter a percent.
  * Press Apply slip % to set all active cells to focused-cell slip × percent/100.

CSV save:
- Adds Row1=shallow/deep into the metadata comment so the orientation can be preserved.
