Add native Roam renderer for presentations

[mdroidian]

Summary

• add a parallel native renderer under presentation2 / slides2 while leaving the existing presentation / slides path available
• delegate slide trees, layout source blocks, notes, and collapsible nodes to ui.react.Block, and formatted titles to ui.react.BlockString
• preserve presentation orchestration including Reveal layouts, themes, notes, transitions, hiding, auto-animate, focus restoration, and progressive collapsibles
• restore native bullets, suppress Roam indentation multibars, normalize title typography/alignment, and contain iframe/video media inside their configured layouts
• add architecture notes, reproducible baseline/coverage fixtures, side-by-side screenshots, native-feature proof, and walkthrough videos

Why

The current renderer reconstructs Roam blocks as custom HTML. That loses native component behavior and lifecycle for code blocks, queries, search results, embeds, block view types, Excalidraw, Mermaid, tables, and other extension-owned renderers. The new path keeps Presentation-specific orchestration but lets Roam render the content itself.

Validation

• npm run build:roam — source built with 0 errors
• authenticated Roam baseline: 17 slides from each renderer, no page errors
• post-fix comparison: native bullets present and zero visible .rm-multibar guides across all 17 slides
• native feature deck: 2 code editors, 2 KaTeX renders, live query/search, page and block embeds, Document and Numbered views, Excalidraw rectangle drawing, Mermaid SVG, and native table
• checked-in full-resolution comparisons, contact sheets, capture metrics, and both renderer walkthrough videos

Closes #6

[coderabbitai]

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