demo: integrate tomorrow’s complete knowledge workflow

[wfnuser]

Summary

Integrates the independently reviewed demo features into one conflict-resolved branch:

• public URL capture as portable Markdown Source (feat(desktop): capture web Sources as Markdown #144)
• rendered/source Review views (feat(review): add rendered Markdown preview #145)
• Source → Agent → commit → Review lineage (feat(lineage): trace knowledge to Sources and Agents #146)
• explicit Local/Cloud context (feat(ui): make Local and Cloud context explicit #147)
• local and Cloud comments with mentions (feat(comments): unify local and Cloud review threads #148)
• sandboxed interactive HTML View (feat(wiki): render interactive HTML in a sandbox #149)

Deployment order

Merge and deploy wfnuser/cowiki-backend#11 first so Cloud provenance, complete Review content, comments, and notifications are available when this frontend reaches dev.

Verification

• full web test suite
• ESLint
• production web build
• 113 desktop Rust tests
• rustfmt and Clippy with -D warnings
• browser walkthrough covering lineage, Source preview, HTML interaction, Cloud comments, and rendered Review preview

This is the conflict-resolved integration PR for demo validation; individual feature PRs remain available for focused review.

[netlify]

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[wfnuser]

Demo rehearsal result

The combined branch was exercised as one workflow:

1. Open a Cloud wiki page containing a repository-relative Source reference.
2. Open the captured Markdown Source and its original URL.
3. Follow Source → Agent → commit → Review provenance.
4. Execute a self-contained HTML View interaction inside the sandbox.
5. Read the same Cloud comment thread and visible Cloud shared context.
6. Open the linked Review and switch from source diff to rendered before/after Markdown.

Local verification is green: complete web tests/lint/build, 113 desktop Rust tests, strict Clippy, and the production-shaped browser walkthrough. Netlify preview: https://deploy-preview-150--cowiki-test.netlify.app