chore: deploy analytics sites with trend charts

[MillenniumFalconMechanic]

Ticket

Closes #4825

Summary

• Copy regenerated static analytics sites to gh-pages/ directory for deployment
• Adds event_charts.json data files for all three apps (HCA, AnVIL Explorer, LungMAP)
• Updates templates with trend chart rendering code
• Updates file download data to use count-only format

Test plan

• All three sites verified locally before copying
• Verify charts appear on deployed site after merge

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR updates the generated static analytics dashboards (AnVIL Explorer, HCA Data Explorer, LungMAP) in gh-pages/ to support export-event trend charts, and simplifies file download reporting to “count-only” totals to reduce payload/UI complexity.

Changes:

• Add event_charts.json time-series data files for each site and update index.html to fetch/render trend charts via Chart.js.
• Change file download datasets (file_downloads.json, file_download_events.json) from row-level tables to total-only JSON and update templates accordingly.
• Update per-app generate_static_site.py scripts to write output directly into the deployable gh-pages/ folders.

Reviewed changes

Copilot reviewed 20 out of 21 changed files in this pull request and generated 12 comments.

Show a summary per file

File	Description
gh-pages/lungmap/index.html	Adds event trend chart rendering and converts file download sections to total-only cards.
gh-pages/lungmap/data/meta.json	Regenerated metadata timestamp.
gh-pages/lungmap/data/file_downloads.json	Switches to { "total": ... } format.
gh-pages/lungmap/data/file_download_events.json	Switches to { "total": ... } format.
gh-pages/lungmap/data/event_charts.json	Adds monthly event chart series data.
gh-pages/hca-explorer/index.html	Adds event trend chart rendering and converts file download sections to total-only cards.
gh-pages/hca-explorer/data/pageviews.json	Regenerated pageview data.
gh-pages/hca-explorer/data/monthly_traffic.json	Regenerated traffic series data.
gh-pages/hca-explorer/data/meta.json	Regenerated metadata + updated rollup values.
gh-pages/hca-explorer/data/file_downloads.json	Switches to { "total": ... } format.
gh-pages/hca-explorer/data/file_download_events.json	Switches to { "total": ... } format.
gh-pages/hca-explorer/data/event_charts.json	Adds monthly event chart series data.
gh-pages/anvil-explorer/index.html	Adds event trend chart rendering and converts file download sections to total-only cards.
gh-pages/anvil-explorer/data/meta.json	Regenerated metadata timestamp.
gh-pages/anvil-explorer/data/file_downloads.json	Switches to { "total": ... } format.
gh-pages/anvil-explorer/data/file_download_events.json	Switches to { "total": ... } format.
gh-pages/anvil-explorer/data/event_charts.json	Adds monthly event chart series data.
analytics/lungmap-analytics/sheets/generate_static_site.py	Changes generator output directory to gh-pages/lungmap.
analytics/hca-explorer-sheets/generate_static_site.py	Changes generator output directory to gh-pages/hca-explorer.
analytics/anvil-explorer-sheets/generate_static_site.py	Changes generator output directory to gh-pages/anvil-explorer.

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