BootstrapSpark: merge JsBootSpark features into ReactSparkPortfolio

[markhazleton]

Summary

Consolidates the JsBootSpark feature set into the React application and completes BootstrapSpark brand alignment.

Changes

• Added Bootstrap showcase pages and advanced component demos.
• Added rich data tables experience with sorting, filtering, pagination, export, and song drill-down.
• Added site demo pages for SaaS Dashboard, Team Collaboration, and Product Catalog.
• Reworked Community page to replace the old contact form flow with contribution-focused content and GitHub CTAs.
• Reorganized top navigation with Apps, Showcase, and Site Demos groupings.
• Updated routing, SEO metadata, and sitemap coverage for new and migrated pages.
• Added tsbuildinfo ignore handling to keep source/build artifacts separated.
• Synced implementation artifacts and quickstart guidance with current behavior.

Task Completion

• Tasks: 45/45 complete
• Checklist: requirements 16/16 complete

Quality Gates

• Analyze gate artifact present and passing
• Gate acknowledgements recorded for analyze and critic timing decisions

Gate Acknowledgements

• Explicit proceed decisions are documented in tasks.

Spec Reference

.documentation/specs/001-merge-jsbootspark

Quickfix Reference

N/A

Notes

• Working tree is clean at preflight time.
• No existing PR detected for this branch.
• Required gate metadata and historical gate acknowledgements contain timing inconsistencies for analyze/critic; reviewers should verify final gate artifact state before merge.