Add cartoon content creation flow on /create page

[realproject7]

Summary

• Fiction/Cartoon selector on /create page, defaulting to Fiction
• Fiction mode unchanged (text area + markdown)
• Cartoon mode replaces text area with multi-image upload via /api/upload-plot-images
• Drag-and-drop reordering, optional alt text and scene labels per panel
• Vertical webtoon preview of uploaded images
• Publishes as generated markdown image sequence with contentType: "cartoon" in metadata
• 10K character budget displayed and enforced for generated markdown
• Invalid image types/sizes blocked client-side before upload

Closes #1215

Test plan

• TypeScript typecheck passes
• ESLint passes (no new errors)
• Unit tests pass (cartoon markdown generation: ordering, labels, budget)
• Full test suite passes (62 tests)
• RE1/RE2 review
• Manual: Fiction mode unchanged after adding selector
• Manual: Cartoon mode — upload images, reorder via drag, add labels
• Manual: Preview shows vertical webtoon sequence
• Manual: Publish cartoon storyline, verify contentType stored correctly

🤖 Generated with Claude Code

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
plotlink	Ignored		May 16, 2026 11:34pm

[realproject7]

RE2 Review: ✅ Approve

Well-structured feature. Clean separation between markdown generation, upload UI, and preview.

Highlights:

• Fiction flow completely untouched when selector is on Fiction — good isolation
• CartoonUploader handles drag-and-drop reordering cleanly with visual feedback
• Client-side validation mirrors server-side checks (type, size) — prevents wasted upload attempts
• generateCartoonMarkdown is pure and well-tested (ordering, labels, budget)
• contentType: "cartoon" correctly passed through metadata to the indexer
• Alt text derived from filename is a nice accessibility touch

Minor non-blocking note:

• The MIN_CONTENT_LENGTH (500 chars) check applies to the generated cartoon markdown. A typical IPFS image markdown line is ~60-80 chars, so a cartoon with <6 panels may fail the minimum content validation. If this is intentional (ensuring enough panels for a meaningful story), it's fine. If not, cartoon mode may need a lower minimum or panel-count-based minimum instead. Not a blocker for this PR — can be addressed as UX feedback.

CI still pending at review time.

[project7-interns]

Verdict: APPROVE

Summary

The cartoon create flow is wired through cleanly: Fiction remains the default path, Cartoon mode uses the batch image endpoint, generated markdown is published as the content payload, and contentType: \"cartoon\" is passed to the storyline indexer metadata.

Findings

• None blocking.

Decision

Approved. The implementation matches the #1215 acceptance criteria. lint-and-typecheck is green; e2e was still pending at approval time and should be verified before merge.