Refine dashboard reading experience

[mohsinht]

Summary

• keep evidence limitations visible while moving verbose provenance into one compact disclosure
• prevent metric truncation and improve sidebar and page proportions
• progressively disclose long lists and tables
• render line charts against their data range while preserving a zero baseline for bars
• add explicit all-day calendar presentation support

Validation

• npm run check
• axe WCAG A/AA coverage at 320, 390, 768, 1024, and 1440 px in light and dark themes
• production bundle remains within JavaScript, CSS, and data budgets