Viewer UX improvements, cachecannon template, and combine bypass flag

[thinkingfish]

Summary

• Topology rendering: rewrite LLC group layout with explicit row packing and bestCols() for even core distribution across rows; fix wrapping for large LLC groups (e.g. 32 cores → 4×8 instead of 15,15,2)
• Percentile chart Y-axis: rescale Y when selecting a subset of quantiles via legend pin; fix null zoomLevel crash when pins are active at default zoom
• Light theme: eliminate gradients on main containers, fix card backgrounds to match chart brightness, fix Reset button spacing from granularity selector, fix uneven core cell widths when caches toggled off
• Cachecannon template: expand KPIs with GET/SET latency histograms, cache hit/miss rates, byte TX rate, and operation counts using correct metric names (cache_hits, cache_misses, get_count, set_count)
• Parquet combine: add --bypass-time-check flag to skip timestamp alignment quality validation

Test plan

• Load a parquet file with histogram percentile charts, click legend items to pin individual quantiles — verify Y-axis rescales to fit selected series
• View topology diagram with 32+ cores — verify even row distribution with no dangling cores
• Toggle light theme — verify no gradients on cards/containers, consistent backgrounds
• View cachecannon parquet — verify all KPI charts render with correct data
• Run rezolus parquet combine --bypass-time-check — verify alignment check is skipped with warning

🤖 Generated with Claude Code