perf(dashboard): lazy-load usage analytics charts

[KooshaPari]

Summary

• Lazy-load Recharts from the shared usage analytics chart components instead of importing it statically from the dashboard analytics bundle.
• Split Recharts-backed analytics charts into focused modules so the frozen file-size and dead-code ratchets stay green.
• Preserve existing no-data/no-cost branches so empty chart cards do not download the Recharts chunk.
• Reset the dynamic import cache on chunk-load failure so a later render can retry.

Related Issues

• Related to perf(dashboard): v3.8.31 production dashboard still loads multi-MB global font/icon/chart/provider assets #4436

Validation

• npx prettier --write src/shared/components/analytics/charts.tsx src/shared/components/analytics/index.tsx src/shared/components/analytics/chartColors.ts src/shared/components/analytics/rechartsCore.tsx src/shared/components/analytics/rechartsUsageCharts.tsx src/shared/components/analytics/rechartsDonuts.tsx tests/unit/shared/analytics-recharts-lazy.test.ts
• npx eslint src/shared/components/analytics/charts.tsx src/shared/components/analytics/index.tsx src/shared/components/analytics/chartColors.ts src/shared/components/analytics/rechartsCore.tsx src/shared/components/analytics/rechartsUsageCharts.tsx src/shared/components/analytics/rechartsDonuts.tsx tests/unit/shared/analytics-recharts-lazy.test.ts --quiet
• node --import tsx/esm --test tests/unit/shared/analytics-recharts-lazy.test.ts
• npm run check:file-size
• npm run typecheck:core -- --pretty false
• npm run build (passes; existing open-sse/services/browserPool.ts dynamic dependency warnings remain)
• PR Test Policy local check after commit
• Pre-commit/push: npx lint-staged, docs sync, npm run check:any-budget:t11, node scripts/check/check-tracked-artifacts.mjs
• npm run test:unit
• npm run test:coverage
• CI coverage check passed
• SonarQube PR analysis passed

Tests Added Or Updated

• Added tests/unit/shared/analytics-recharts-lazy.test.ts to guard that Recharts is only imported through the lazy loader boundary.

Coverage Notes

• Production code changed under src/shared/components/analytics/.
• Covered by a focused unit test for the lazy-loading boundary, TypeScript, focused ESLint, file-size guard, production build, and commit/push hooks. Full unit and coverage suites were not run locally, but CI unit shards and coverage completed successfully.

Reviewer Notes

• This is a first narrow slice for perf(dashboard): v3.8.31 production dashboard still loads multi-MB global font/icon/chart/provider assets #4436: it removes the shared usage analytics module's static Recharts dependency, but other dashboard pages still have separate static Recharts imports and can be handled in follow-up PRs.
• Build output still reports the existing open-sse/services/browserPool.ts dynamic dependency warning; this PR does not touch that path.
• The remaining Integration Tests (2/2) failure is inherited from upstream main at base SHA d0396c2 and fails the same chat-pipeline.test.ts and memory-pipeline.test.ts tests there.

[gemini-code-assist]

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