Bug fix
Removed content-visibility: auto from broad <ul>/<ol> selectors and .v2-tag-section in the V2 elite stylesheet.
On the slate (dark) theme it caused:
- Black flashes while scrolling
- Link lists below the index mosaic appearing collapsed/broken (intrinsic-size mismatch → scrollbar jumps)
The tags page already uses collapsed <details> (native render skipping), so the optimization was redundant and harmful. A warning note was added to prevent reintroduction.
CSS cache-bust bumped to ?v=2.9.2.
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