feat(web): add Deep Analysis page (/analysis.html) as second Vite entry

[vsits-proxy-builder]

Summary

Adds the Deep Analysis page as a second Vite entry point alongside the dashboard from PR #19. Sourced from Design Agent's 2026-05-20 addendum archive, with the chart-layer ported from Highcharts to Apache ECharts to match the post-PR-#19 codebase.

What changed

• 6 new files added under web/:
  • web/analysis.html — second Vite entry
  • web/src/analysis-main.jsx — React entry
  • web/src/AnalysisApp.jsx — top-level composition
  • web/src/components/analysis-sections.jsx — section components
  • web/src/components/analysis-charts.jsx — five ECharts components (CapacityScenarioChart, CacheSensitivityChart, QuotaWindowsChart, SubstitutionChart, HypothesisRangeChart) — ported from Highcharts to ECharts during this commit, not lifted verbatim from the archive
  • docs/web-handoff-2026-05-17/ANALYSIS_PAGE.md — addendum handoff doc (corrected to the current state: ECharts, scrubbed IP)
• 2 edits:
  • web/vite.config.mjs — added rollupOptions.input.analysis so vite builds both entry points
  • web/src/lib/chartBase.jsx — added LineChart to the registered ECharts component set (needed by the 2 line/area charts on the analysis page)

Provenance note

The Design Agent archive (/tmp/Claude Meter(2).zip) was generated against a snapshot of the project from before PR #19 merged — so its chartBase.jsx, charts.jsx, and package.json were Highcharts-era regression state, and its README.md referenced the pre-rotation droplet IP. Only the genuinely-new pieces were applied; the chart layer was re-ported to match the current ECharts codebase.

Bundle impact

Page	Pre-PR-#21 (gzip JS)	Post-PR-#21 (gzip JS)	Delta
/ (dashboard)	254.18 KB	~264 KB	+10 KB (LineChart registration)
/analysis.html	n/a	~271 KB	new page

Shared chunk served once, cached across both pages.

Test plan

• cd web && npm install && npm run build succeeds; both index.html and analysis.html produced
• Dev server smoke test — both entry points serve HTTP 200 through Vite; both analysis-*.jsx modules resolve cleanly
• Operator visual check — load /analysis.html in a browser via npm run dev, confirm all 5 new charts render against live /api/v1/dataset data
• Operator visual check — confirm dashboard at / still renders unchanged from current production
• Codex pre-merge review

Known soft notes

• Bundle grew ~10 KB gzip on the dashboard page from the LineChart registration. Cheaper than splitting chartBase.jsx into entry-conditional registrations; flagged for future code-splitting if bundle weight becomes a concern.
• ECharts aria config is enabled on the analysis page same as the dashboard; ECharts a11y is less mature than Highcharts'. Same soft-regression flag as PR feat(web): add Vite + React dashboard redesign (handoff from Design Agent) #19.

🤖 Generated with Claude Code

[vsits-codex-review-agent]

Approved. I reviewed 5831d3a at HEAD with emphasis on the ECharts translation risks, dual-entry Vite wiring, and the analysis-page handoff note.

Checks run:

• Verified all three analysis-page markLine usages are nested under series, not at top-level.
• Verified HypothesisRangeChart keeps its per-line lineStyle overrides on each markLine.data entry, preserving distinct parity vs hypothesis styling.
• Verified QuotaWindowsChart reverses both y-axis categories and series data consistently, yielding Q7d at the top and Q5h at the bottom as annotated in-code.
• Verified CacheSensitivityChart uses a line series with areaStyle and a series-scoped markLine at xAxis: 88.
• Verified SubstitutionChart uses per-bar itemStyle.color like the dashboard pattern, and CapacityScenarioChart / tooltip wiring are coherent.
• Verified web/src/lib/chartBase.jsx imports LineChart from echarts/charts and the registration now matches actual usage.
• Verified web/vite.config.mjs resolves both index.html and analysis.html via resolve(__dirname, ...); production build confirms __dirname works in this config.
• Verified analysis-sections.jsx imports resolve cleanly (fmtN from derive.js, Footer from the current sections.jsx) with no leftover Highcharts-specific dependencies.
• Verified docs/web-handoff-2026-05-17/ANALYSIS_PAGE.md matches the stated provenance, uses <droplet> placeholders, and no tracked file contains a literal droplet IP (rg -n '143\\.|ssh root@[0-9]' $(git ls-files) returned no matches).
• Ran cd web && npm install && npm run build.

Measured build output:

• public/index.html: 1021 raw / 462 gzip
• public/analysis.html: 1054 raw / 480 gzip
• public/assets/index-C27HMDkz.js: 1269 raw / 588 gzip
• public/assets/analysis-DdAqeKnU.js: 27910 raw / 7938 gzip
• public/assets/styles-d46ryG66.js (shared JS chunk): 795074 raw / 262243 gzip
• public/assets/styles-jh9ZJAEq.css: 13312 raw / 3288 gzip

These are all in-family with the expected figures. The only warning was Vite's standard chunk-size warning for the shared ECharts bundle.

— Codex review