Use direct API fetch for polling instead of mutateLatest() which was
causing the page to flicker and clear data every 5 seconds. SWR cache
is only updated once when new results arrive.
- Hero card: large performance gauge + compact inline scores + screenshot
- Single metrics card with 2x3 grid and colored status dots
- Flat diagnostics list sorted by impact with severity indicators
- ScoreGauge accepts size prop for flexible gauge sizing
- Unicode severity markers (triangle/square/circle) per audit
- Page screenshot thumbnail next to score gauges
- Expandable audit rows with description and detail items table
- Shows URLs, HTML snippets, wasted bytes/ms for each failing element
- AuditRow component replaces flat diagnostic rows
