chore: release mix_generator 2.1.2 and mix_annotations 2.1.2

[leoafarias]

Release both packages as patch 2.1.2.

mix_generator 2.2.0 → 2.1.2

Everything unreleased since 2.1.1 ships under a single ## 2.1.2:

• FEAT variant widget constructors (feat(mix_generator): generate variant widget constructors #968)
• FEAT nested styler types by convention (feat(mix_generator): derive nested styler types for StyleSpec fields by convention #961) — see breaking note below
• FIX @MixWidget generic call<T>() (fix(generator): support generic @MixWidget call methods #958)

(The 2.2.0 that #968 set was never tagged/published, so renumbering down is safe.)

mix_annotations 2.1.1 → 2.1.2

• DOCS nested-styler convention comment (feat(mix_generator): derive nested styler types for StyleSpec fields by convention #961)

Notes

• Breaking-change flag stays honest: the nested-styler entry keeps its **Breaking** note (nested StyleSpec params now take the styler). It's narrow — only external specs with nested StyleSpec fields, compile-time — but real. Shipping it under a patch is a deliberate maintainer call; ^2.1.1 consumers pick up 2.1.2 exactly as they would 2.2.0, so the number is a signal, not a gate.
• Dependency constraint left at mix_annotations: ^2.1.1 — the generator has no functional dependency on the annotations doc change, and the caret already admits 2.1.2. Say the word to tighten it to ^2.1.2.
• Docs/version-only; no code change. Dry-runs pass for both (only the expected uncommitted + monorepo-override notices).

Launch after merge

git tag mix_annotations-v2.1.2 <merge-sha> && git push origin mix_annotations-v2.1.2
git tag mix_generator-v2.1.2  <merge-sha> && git push origin mix_generator-v2.1.2