fix: use accountinfo for bucket statistics

[marshawcoco]

Pull Request

Description

Windows trace evidence showed the bucket list receiving complete accountinfo statistics while datausageinfo was still partial. The Console displayed the partial values because both bucket-list implementations sourced object count and size exclusively from datausageinfo.

This change makes accountinfo.buckets authoritative for bucket object count and size in both the browser root and shared bucket-list component. It reuses the account information already loaded by the permissions context, refreshes that snapshot when the user presses Refresh, preserves valid empty-bucket zero values, and shows unavailable values instead of fabricating zero for missing or malformed statistics. datausageinfo remains available for deployment-wide usage and scanner-oriented views.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Code refactoring
• Performance improvement
• Test improvements
• Security fix

Testing

• Unit tests added/updated
• Manual testing completed

npx -y node@22 --test tests/lib/*.test.js
npx -y node@22 /usr/bin/corepack pnpm type-check
npx -y node@22 /usr/bin/corepack pnpm lint
npx -y node@22 /usr/bin/corepack pnpm format:check
npx -y node@22 /usr/bin/corepack pnpm build

Checklist

• Code follows the project's style guidelines
• Self-review completed
• TypeScript types are properly defined
• All commit messages are in English (Conventional Commits)
• All existing tests pass
• No new dependencies added, or they are justified

Related Issues

Fixes #159.

Related to rustfs/rustfs#3775.

Screenshots (if applicable)

The visual symptom and request-level evidence are documented in rustfs/rustfs#3775 and #159.

Additional Notes

The Windows trace captured complete accountinfo values (1600 objects / 209715200 bytes) and partial datausageinfo values (1502 objects / 196870144 bytes) during the same cold load; the Console displayed the latter exactly. A subsequent datausage refresh converged, which explains why the existing Refresh action appeared to repair the page.

RustFS PR rustfs/rustfs#4698 separately prevents incomplete distributed listings from being accepted by backend usage refreshes. This PR fixes the Console contract independently by using the per-account bucket statistics returned for that purpose instead of selecting a scanner-derived deployment usage snapshot for bucket rows.