Add Plotly config for WebGL iframe compatibility

Fix landform animations: barchan, U-valley, volcanoes, lava plateau; add Lab page, zone overlay

Add PhD-level formation processes for 8 landforms with metadata and stage descriptions

Add 6 new landforms, improve animation, add Overview page

Fix: IndexError in alluvial_fan_animated bounds check

v4.3: Multi-Page structure + 5 new landforms (uvala, tower_karst, karren, transverse_dune, star_dune)

Geo-Lab v4.1 - Clean deployment