Add accessible progress bars #174
- MA
## Summary - add an accessible, brand-accent `ProgressBar` primitive to `@chopin/visuals` - normalize decimal, out-of-range, extreme, and non-finite values safely - add zero, in-progress, and complete design-audit coverage
## Scope ProgressBar only. Badges, metric deltas, tooltips, and product adoption remain separate slices.
## Stack - depends on #173
## Verification - focused tests: 36 pass - `bun test`: 1,497 pass, 2 PostgreSQL skips, 0 fail - `bun run types` - `bun run ci` - `bun run build` - `git diff --check`
## Component preview

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