Stop mobile horizontal overflow in the TPP + EDCR…

Details

The interactive explainers' control rows didn't wrap, spilling ~140px
past a 390px viewport and forcing horizontal page scroll on mobile — a
separate cause from the nav overflow already fixed. Below 700px, wrap the
pill rows and give single-line strips an internal overflow-x scroller,
add min-width:0 to the flex children, and clamp the stage to 100% width.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YB1axhX3kbHCFJbX7LhfH8

Files changed (2)