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docs(infield-button): add Phase 1 migration plan (#6441)

* docs(infield-button): add Phase 1 migration plan

Adds the Phase 1 (prep) migration plan for swc-infield-button: 1st-gen
API surface, breaking changes, 2nd-gen API decisions, core/SWC split,
and the full Setup/API/Styling/A11y/Testing/Docs checklist.

Design and CSS inputs are confirmed against the Figma S2 In-field button
spec and the spectrum-two infieldbutton/index.css baseline. Styling and
section structure follow the migration-prep template and align with the
button/action-button plans. Updates the components README nav.

Co-authored-by: Cursor <cursoragent@cursor.com>

* chore: updated docs

* revert(storybook): remove preview.ts change from infield-button PR

The Sidenav accessibility-migration-analysis entry in preview.ts belongs
to a separate commit and should not be part of this migration plan PR.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* docs(infield-button): address review comments

- S3: clarify that standalone use retains its own focus-visible ring; the
  outline:none suppression applies only in composed field contexts
- Drop 'active' from public API: not in ButtonBase; :active CSS handles
  pressed visual; no toggle use case in-field
- Drop 'type' from public API: not in ButtonBase; concrete template hardcodes
  type="button"; submit/reset deferred to A3
- static-color: add note that if ButtonBase gains staticColor (PR #6410),
  swc-infield-button must explicitly exclude it
- Default slot: fix wording — slots are in the concrete template, not
  provided by ButtonBase (which has no render method)
- Render template: replace BEM modifier classMap with attribute selectors;
  quiet and size are reflected so :host([quiet]) / :host([size="s"]) apply
- Remove fill wrapper div from template; add Phase 5 note to verify whether
  the wrapper is required or ::slotted() alone is sufficient

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* revert(storybook): r... (continued)

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