fix(ui): declare cn 0.2.6 and verify the bump #34 shipped

[suiramdev]

Summary

Declares cn 0.2.6 in the two packages that depend on it, and verifies the bump that #34 already shipped by accident: @shadcn/lint depends on cn@0.2.6 exactly, the caret ranges admitted it, and Bun deduped the workspace onto one copy — so node_modules ran 0.2.6 while both manifests still said 0.2.5. Look at packages/ui/src/lib/utils.test.ts first: it caught the change, and it was pinning a merge that cannot happen at runtime.

Motivation

• The declared range and the resolved version disagreed, which makes a lockfile refresh look like a version change.
• 0.2.6 is not CLI-only: dist/index.js and dist/engine.js are byte-identical to 0.2.5, dist/tables.js is not, and GROUP_COUNT goes 379 → 384.
• The golden-corpus test caught it locally, and CI has no test job, so nothing else would have.
• Six where: paths in that corpus went stale in the Feature-Sliced Design move and now point at the real files again.

Drawbacks

• The commit verifies a bump that is already in dev; the evidence arrives after the fact, not before.
• One row of the corpus becomes two, which is slightly more to maintain — the alternative is a row that pins an impossible call.
• The lefthook change relaxes a failure mode. A commit that stages no lintable file now passes the hook silently.

Prior art

• The repository already treats a class-merge change as a restyle: this corpus exists because cn replaced clsx + tailwind-merge, and it records the previous output verbatim.
• tailwind-merge 3 is no longer the arbiter for theme utilities: its animate validator accepts only built-in names, so it cannot group animate-fd-*. Grouping them is the 0.2.6 fix, since both set animation in Tailwind v4.
• --no-error-on-unmatched-pattern is oxlint's own flag for the empty-input case, not a wrapper script.

Notes

• No visual change. The AI panel of the documentation site was opened in a browser and renders one animation class per state: animate-fd-fade-in → fd-fade-in, and the dialog → ask-ai-open.
• Evidence, measured rather than argued: 307 real cn() call sites replayed through 0.2.5 and 0.2.6 report 0 differences; all 1 989 510 ordered pairs of the 1 411 recognized class tokens report 28, every one of them two animation classes collapsing; recognition gains 6 tokens and loses 0.
• Unreachable: three source lines carry two animation classes — two ternaries in ai-search.tsx, where only one branch reaches cn, and the data-open/data-closed pairs in alert-dialog.tsx and popover.tsx, which sit under different variants.
• Tests: no new test. The existing corpus row is corrected, and both branches now agree across 0.2.5, 0.2.6 and tailwind-merge 3.
• apps/fumadocs pages: none. A dependency bump that changes no documented behavior needs no docs page; packages/ui/AGENTS.md gains the rule that a cn upgrade is a restyle until the corpus says otherwise.
• Gates: bun run check, bun run check-types, bun run check:fsd, bun run docs:check (38 pages, 0 errors, 0 warnings), bun run build, and all three suites — 16 + 294 + 134 pass.
• The lefthook fix was needed to commit this at all: every source file here is under packages/ui, which oxlint.config.ts ignores. Verified it still fails on a real violation.

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