Merge branch 'main' into equation-update

Updated allometric equations (incl. generic mangrove ELSE option), planting schedule defaults, and documentation

Update allometric equations with corrected coefficients - R. racemosa: TB = 2.0738 · (D²H)^0.67628 (was 1.938) - A. germinans: TB = 1.5595 · (D²H)^0.55864 (was 1.486) - Updated allometry.py, config files, dashboard documentation, and tests

chore: UI/UX cleanup, grouped accordions, tooltips as labels, compact mortality layout, reset button

Dashboard cleanup: remove per-hectare chart, improve table formatting, clarify table names and titles

Refactor declining_increment_growth to accumulate increments, fix negative height/DBH; enable robust multi-model support

Initial commit: ER model for Nigeria mangroves