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Progress Bar Migration (#6488)

* Migration through Phase 4 Progress Bar (#6438)

* feat(progress-bar): 2nd-gen migration phases 1-4 (setup, API, a11y)

Creates the 2nd-gen `<swc-progress-bar>` component through phase 4:

- Core: `ProgressBarBase` extending `LinearProgressMixin` with
  `indeterminate` boolean; types file re-exporting shared linear-progress
  surface; no variant (single accent fill).
- SWC: `ProgressBar` with full `role="progressbar"` render template,
  determinate value attrs, indeterminate suppression via Lit `nothing`,
  `aria-labelledby`/`aria-label`/`aria-describedby` wiring, description
  slot support.
- Mixin: replace hard-coded meter docs URL with a computed `docsHref`
  getter derived from `this.localName` so each concrete component gets an
  accurate docs link with no per-subclass override.
- 1st-gen: `@deprecated` JSDoc on `progress`, `sideLabel`, and `label`
  string attribute for renamed/replaced APIs.
- Migration plan: phases 1-4 checklists updated; B9 (role placement on
  shadow vs host) flagged for a11y expert review.

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

* fix(progress-bar): lint

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

* Phase 5: progress-bar full fidelity  (#6455)

* chore(progress-bar): update reduced motion

* style(progress-bar): value changes

* style(progress-bar): spacing in storybook

* fix(progress-bar): remove meta JSDoc and stories .gitkeep per review

* chore(progress-bar): storybook, tests and update to migration skill (#6456)

* chore(progress-bar): storybook, tests and update to migration skill

* test(progress-bar): remove duplicate test and target warnings by type/message

* test(progress-bar): update with waitFor

* fix(progress-bar): address feedback from PR Review

* chore(progress-bar): added migration guide (#6485)

* chore(progress-bar): added change logs and prettier fix

* fix(progress-bar): additional example in doc

* fix(progress-bar): fix... (continued)

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