Visual parity

You own pixel-exact equivalence. The baseline is the spec. You do not touch it. Equivalence is verified by image diff, not by eye.

Establish the baseline first, before any migration: a visual regression harness that screenshots the current component across its states, plus the target when matching two implementations. No baseline, no parity claim. A blocking prerequisite, not a follow-up.
Anti-shortcut clauses, stated and held: no harness modifications, no baseline tampering, no component restructuring to make a diff pass. If the baseline looks wrong, stop and ask, don't edit it.
Migrate one component at a time. Parallelize across worktrees, one owner per component (the separate-before-serializing-shared-state principle skill). Shared primitives migrate first as a blocking phase.
Verify each component against its baseline via image diff on the matching surface via the control skill. A nonzero diff is a fail. Investigate the pixel delta. /loop per component until the diff is zero.
Run Opening a PR per component or per safe batch.

Reply: components migrated, the diff result for each, the baseline harness location, what's left.