Fix React purity violations in component rendering

[Copilot]

Fixes lint errors blocking CI, primarily React Compiler purity rule violations.

Changes

sidebar.tsx - Math.random() purity violation

// Before: useMemo with impure function
const width = React.useMemo(() => {
  return `${Math.floor(Math.random() * 40) + 50}%`
}, [])

// After: useState with lazy initializer
const [width] = React.useState(() => `${Math.floor(Math.random() * 40) + 50}%`)

SchemaRenderer.tsx & statistic.tsx - Dynamic component resolution

• Suppressed "cannot create components during render" for intentional dynamic component patterns
• Component references are resolved from registry/icon library, not created inline

Minor fixes

• @ts-ignore → @ts-expect-error in statistic.tsx (ESLint requirement)
• Empty interface warning suppression in native-select.tsx (valid type re-export pattern)

Original prompt

引用: https://github.com/objectstack-ai/objectui/actions/runs/21476284581/job/61861016274#step:8:1

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Project	Deployment	Review	Updated (UTC)
objectui	Ready	Preview, Comment	Jan 29, 2026 11:44am
objectui-components	Ready	Preview, Comment	Jan 29, 2026 11:44am
objectui-crm-app	Error		Jan 29, 2026 11:44am

[github-actions]

✅ All checks passed!

• ✅ Type check passed
• ✅ Tests passed
• ✅ Lint check completed