V130 compile fix
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Base: v129_csv_dip_station49_no_shallow_damping

Fixes MinGW errors in tsunami_gui_win32.c:
- Restored quick_ff_rel_d_from_row() before quick_ff_auto_delay_from_zero_cell().
- Restored quick_ff_recompute_relative_grid() before quick_ff_wnd_proc().
- Added quick_ff_update_mw_preview() forward declaration in the same helper block.

No physics changes from v129.
Okada remains unused/scalar branch remains unchanged.
