Today's Highlight: add chart per entry + expand to 36 (v2.8.0)

[Varnasr]

Summary

Two improvements to Today's Highlight:

1. Every highlight now has a chart

A mini ECharts visualization inside the highlight card, drawn from the relevant data series. Seven chart variants are supported:

Type	Use
line	Single series (formal employment, FCI, GDP, etc.)
pair	Two side-by-side series (top 1% vs bottom 50%)
dual	Two series on shared axis (GDP vs formal employment)
multi	3+ series with per-key normalisation (SSI/FCI/DQI)
bar-inv	Inverted y-axis for rank metrics (press freedom)
csv-line	Sourced from the supplementary CSVs (lazy-loaded if needed)
intl	Grouped bars 2014 vs 2026 across peer countries

CSV-sourced charts auto-trigger loadCSVData() if the data hasn't been fetched yet, then re-render.

2. Expanded 14 → 36 features

Over a month of distinct daily highlights before any repeat. New coverage:

• All 5 supplementary CSV datasets (communal incidents, opposition incarceration, education events, sanitation, cess share)
• All 3 constructed indices with their own dedicated highlights (SSI / FCI / DQI methodology)
• International peer comparisons on both V-Dem and RSF
• More "did you know" angles: female LFPR decline, gig worker 11x growth, rural income flat, 2020 GDP contraction, informal employment > 89%, census 15 years overdue
• Try-this CTAs for Era Comparison, Correlation Explorer, Human Stories
• Categories now: Headline number, Decoupling, Compare regimes, Latest release, Try this, Under the hood, Hidden series, Compare countries, Story behind the number, Open data, Find correlations, Did you know?, Methodology, Surprise stat, Next step

Version 2.8.0.

Test plan

• Reload home page — chart visible inside the highlight card
• Chart matches the highlight content (e.g. inequality highlight shows top1 + bottom50 lines)
• CSV-sourced highlights show a "Loading…" message briefly, then render
• Footer shows "Rotates daily · 36 total"
• Light/dark mode: chart axes and text colors flip correctly

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