New BSRUnitsCorrelationChart component added to the Vendor tab showing:
- Per-marketplace tabs (DE, ES, FR, IT, UK) with market accent colors
- Dual-axis combo chart: bars (units sold, right axis) + line (BSR rank, left axis)
- Inverted BSR axis by default (lower rank = top) with toggle to flip
- Pearson r correlation calculated and displayed with strength interpretation
- Wired to existing combinedAdsData (filtered) and filteredBsrData
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>