Jimmy Lai 4cd3ca26d7 perf: improve stats action reliability and reduce CI noise (#87945) ...

## Summary

Comprehensive improvements to the PR stats action for more reliable benchmarks and reduced CI noise.

### Vercel KV Integration
- Add `@vercel/kv` for historical data persistence
- Track metrics over time with `loadHistory()` / `saveToHistory()`
- Display trend sparklines in comments when history is available

### Comment Generation Refactor
- New `METRIC_LABELS` and `METRIC_GROUPS` configuration system
- Organized metrics by category (Dev Server, Production Builds, Production Runtime)
- Better formatting utilities (`prettifyTime`, `formatChange`, `generateTrendBar`)
- Bundle group totals for KV persistence

### Noise Reduction
- Significance thresholds: `50ms AND 10%` for time, `1KB AND 1%` for size
- Additional `<2%` filter for long-running operations (builds)
- Filters typical CI variance while catching real regressions

### Stats Config Updates
- Add `measureDevBoot: true` to enable dev boot benchmarks
- Fix `appDevCommand` to include `dev` subcommand
- Add `--webpack` flag to `appBuildCommand`
- Rename "Client Bundles (main, webpack)" to "Client Bundles (main)"
- Add `turbopack: {}` to test configs

### GitHub Actions Updates
- New `action.yml` with bundler input parameter
- Workflow improvements in `pull_request_stats.yml`

### New Files
- `scripts/test-stats-benchmark.sh` - Local testing script
- `.github/actions/next-stats-action/src/util/stats.js` - Shared stats utilities
- `.github/actions/next-stats-action/test-local.js` - Local comment testing

## Test Plan
```bash
cd .github/actions/next-stats-action
node test-local.js              # Basic test
node test-local.js --with-history  # Test with trend sparklines
```

2026-01-06 12:36:41 +01:00

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