Heavy media assets v1

Cherry-pick safe changes from Andrewsbranch ac699db5

Brings in homepage theme tweaks, password-protect updates, publication
table refinements, papers data refresh, gatsby config additions, and
the dynamic-belief-games markdown / project entry updates. Three small
DBG project images added (jpg/webm under 1MB).

Deferred until heavy binaries are hosted/replaced:
- src/components/dbg/{DbgMicrosite,DbgProjectHome,dbg-microsite.css}
- src/pages/projects/dynamic-belief-games.js + overview.js + internal/*
- src/pages/projects/computer-algebra-hamiltonian-geometry.{js,css}
- src/pages/projects/scalable-robust-bayesian-co-clustering.{js,css}

These pages JS-import 14 multi-MB PNGs/webms not yet in repo. Heavy
binaries (~130MB total) copied to ~/Downloads/cvc-heavy-binaries/ for
upload to Google Drive; pages will land in a follow-up swapping in
public Drive URLs.

Skipped entirely: the accidental dbg-radios/ Rust simulation dump,
static/projects/dynamic-belief-games/DBG_progress/ MkDocs HTML output,
dbglayout.md, radio_sim symlink, and the re-introduction of the
deleted /research-themes route.