feat: rewrite app as BYO HTML case study viewer

[developeranku]

Summary

• Rewrite stackdeck as an internal viewer for hand-authored HTML case studies (one folder per deck under case-studies/, one HTML file per slide rendered in a sandboxed 1920x1080 iframe). Removes the old editor, IR, blocks, presets, themes, storage, and tests.
• Adds the viewer route /c/[slug] (chrome with breadcrumb, sidebar contents, dark stage), present mode, slide and asset routes, and a printable /c/[slug]/print for PDF export.
• Adds three seed case studies: acme-churn, linen-rebrand, vector-onboarding.
• Establishes a minimal light UI with elevated surfaces, indigo primary CTAs, soft pastel tag chips, warm amber editorial dot, and a dark recessed stage where the white slide pops.

Test plan

• npm run dev, confirm / lists the three seed decks with cover thumbnails.
• Open each deck, verify the sidebar contents preview, prev/next pager at the bottom, and keyboard shortcuts (← → Home End Space F).
• Press F to enter present mode, navigate slides, ESC to exit.
• Hit /c/<slug>/print and verify the print toolbar plus paginated 1920x1080 output.
• Drop a new folder into case-studies/ with a meta.json and at least one HTML slide, confirm it appears on the index without code changes.
• Sanity check responsive breakpoints at 1100px and 900px.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
stackdeck	Ready	Preview, Comment	May 7, 2026 10:42am