fix(rebalance): show cleanup warnings and progress state

[cxymds]

Pull Request

Description

Display backend rebalance cleanup warnings in the rebalance pool table and avoid showing mixed completed/idle pool states as fully completed. This makes failed or partially inactive pools easier to diagnose after a rebalance run.

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

node --test tests/lib/pool-operations.test.js tests/lib/pool-overview-source.test.js
node_modules/.bin/eslint lib/pool-operations.ts 'app/(dashboard)/rebalance/page.tsx' tests/lib/pool-operations.test.js tests/lib/pool-overview-source.test.js
node_modules/.bin/prettier --check lib/pool-operations.ts 'app/(dashboard)/rebalance/page.tsx' tests/lib/pool-operations.test.js tests/lib/pool-overview-source.test.js

pnpm commands could not be executed in the current environment because Corepack rejects the existing devEngines.packageManager.version value ^11.4.0 with Invalid package manager specification in package.json (pnpm@^11.4.0); expected a semver version. Direct full tsc --noEmit is also blocked by existing repository-wide TypeScript configuration/source errors outside this change.

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

Closes N/A

Screenshots (if applicable)

N/A

Additional Notes

The branch intentionally includes only rebalance UI/model/test files. Other pre-existing local workspace changes were not staged.