Optimize pretext demos

[pearmini]

[Copilot]

Pull request overview

This PR restructures the repository’s pnpm workspace to scope demos under demo/pretext and adds a multi-page Vite setup plus new/updated Pretext demo pages (Air Text, U.S. Map Paper, Yin Yang) to support improved demo workflows.

Changes:

• Update pnpm workspace + lockfile to treat demo/pretext as the demo package (and remove the old demo package root).
• Add multi-entry Vite build configuration for the Pretext demos and expose root-level scripts to dev/build/preview them.
• Replace the old demo/ landing/config files with new demo pages and assets under demo/pretext/.

Reviewed changes

Copilot reviewed 7 out of 22 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pnpm-workspace.yaml	Workspace now includes demo/pretext instead of demo.
pnpm-lock.yaml	Updates importer key and workspace link path for the moved demo package.
package.json	Replaces demo:dev with demo:pretext:* scripts.
demo/vite.config.js	Removed; Vite config moved under demo/pretext.
demo/index.html	Removed old demo index page.
demo/pretext/vite.config.js	Adds multi-page Vite build inputs and dependency optimization.
demo/pretext/package.json	Adds build/preview scripts for the demo package.
demo/pretext/index.html	New demo landing page linking to sub-demos.
demo/pretext/yinyang/index.{js,html,css}	New Yin Yang demo page implementation + styling.
demo/pretext/us-map-paper/index.{js,html,css}	New U.S. Map Paper demo implementation + styling.
demo/pretext/us-map-paper/state-notes.js	Adds embedded per-state Wikipedia extracts used by the map demo.
demo/pretext/air-text/index.{js,html,css}	New Air Text demo implementation + styling.
demo/pretext/air-text/{helpers.js,content.js}	Adds helpers/content used by Air Text demo.
demo/pretext/public/logo.svg	Adds logo asset for the demo landing page.
.gitignore	Updates ignored demo lockfile path to demo/pretext/pnpm-lock.yaml.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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