feat(demo): add Chart Reference dashboard

[alfredo1996]

Summary

Adds a new demo dashboard, Chart Reference, that serves as an exhaustive static reference for every customization option NeoBoard charts support.

• One page per chart type (20 pages: bar, line, pie, table, single-value, gauge, sankey, sunburst, radar, treemap, circle-packing, gantt, map, choropleth, graph, json, markdown, iframe, parameter-select, form)
• Each tile demonstrates ONE `chartOption` value changed from default — the tile title tells you exactly what was tweaked (e.g. `orientation = horizontal`, `stackMode = percent`, `palette = warm`, `colorblindMode = true`)
• No parameter knobs — this is a reference, not a playground. Datasets are small and fixed so visual differences are obvious.
• Every option in `component/src/components/composed/chart-options/*` is covered where it has a meaningful visual effect.

How it co-exists with what's there

Showcase	Job
Chart Gallery	One-look tour of supported widgets
Chart Playground (#850)	Interactive knobs over a single chart
Chart Reference (this PR)	Static side-by-side option comparison
Click Actions / Transformations / Rule-Based Styling	Topic-focused deep dives

Stats

• 20 pages, 183 variant tiles + 20 markdown headers (203 widgets)
• `scripts/demo/chart-reference.json` — 4154 lines
• Per-page tile counts: Bar 17, Line 18, Pie 15, Table 13, KPI 13, Gauge 9, Sankey/Sunburst/Radar/Treemap/Map/Choropleth/Graph/JSON/Markdown 8 each, Circle-Packing/Gantt 6 each, iframe 4, Parameter Select 8, Form 2.

Test plan

• JSON validates
• `node cli/dist/index.js demo seed --only chart-reference` succeeds
• DB query: `SELECT name, jsonb_array_length(layoutJson->'pages') FROM dashboard WHERE name='Chart Reference'` returns 20 pages
• Widget count: 203 widgets present across all pages
• Manual: open the dashboard in the app and skim each page; confirm variants render distinct visual differences

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between 93f65a9 and 1773651.

📒 Files selected for processing (2)

• scripts/demo/chart-reference.json
• scripts/demo/showcases.mjs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/demo-chart-reference

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[alfredo1996]

Superseded by #853 — consolidated into a single PR for easier review (number-range editor + integer/float type + dual-handle slider fix + both demo dashboards).