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Three correctness fixes for the `vanilla-css` Tailwind target, each previously untested: 1. Preserve marker utilities. Utilities that produce no declarations (`group`, `peer`, `group/<name>`) were silently dropped when rewriting `className` to the semantic name, breaking every descendant `group-*` / `peer-*` variant. They're now kept on the element (`"play-button group"`), alongside any other class Tailwind doesn't recognize. 2. Flag class-name collisions. Two distinct elements that derive the same class name but resolve to different utilities would have their conflicting declarations silently merged into one rule (e.g. the forward/back `seek-icon`, buffering vs preview `spinner-icon`, current/duration `time-value`). The plugin now tracks a per-name utility signature and throws a fixable DiagnosticError on mismatch, while identical recurrences (repeated `Tooltip.Popup`) pass cleanly. 3. Emit referenced theme variables. The generated CSS referenced `var(--spacing)`, `var(--color-*)`, `var(--ease-*)` etc. with nothing defining them. `emitCss` now accepts a `resolveThemeVar` resolver (backed by `design.resolveThemeVar`) and emits a leading, transitively resolved theme block — scoped to the skin's hoist root when set — so the output resolves without a separate Tailwind theme on the page. Adds 11 tests (markers, collisions, theme emission incl. transitive, already-declared, scoped, and back-compat). Compiler suite: 169 passing. Note: `@property`-registered `--tw-*` slots (e.g. `--tw-content`) resolve to undefined and are left for a follow-up.