feat(lynx): add lynx-toggle headless package

[junghyeonsu]

Summary

Adds @seed-design/lynx-toggle — a headless hook for toggle (pressed) state + tap.

Changes

• useToggle: mirrors @seed-design/react-toggle's API (pressed/defaultPressed/onPressedChange) but composes lynx-use-controllable-state + lynx-use-press-tap
  • pressed (on/off), active (pressed-down visual), rootProps (bindtap/touch handlers)
• ToggleContext + useToggleContext (throw on missing provider)
• ToggleContext typed with @lynx-js/react's Context<T> so the d.ts stays portable

Verification

• bunchee build + typecheck green
• 9 tests passing (controlled/uncontrolled, disabled, bindtap → toggle, active state)
• Real UI verification will happen in the ImageFrame ReactionButton PR

Stack

PR 3/4 — base: lynx-image-pkg (PR #1646). Depends on PR #1645 (headless split). Merge #1645 → #1646 → this.

🤖 Generated with Claude Code

[changeset-bot]

🦋 Changeset detected

Latest commit: c317571

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@seed-design/lynx-toggle	Minor

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