feat: bootstrap-from-figma + patterns platformization

[leefanv]

Summary

Two intertwined product changes that ship together.

1. Bootstrap from Figma — visual theme only

• New /__omit/bootstrap endpoint (GET/PUT/DELETE) on dev-server
• BootstrapBanner in workspace Library page: paste a figma.com URL → copy a Claude prompt, or pick one of 8 built-in palette swatches as a no-URL fallback
• useThemeStore.importTheme() merges design tokens into draft + immediately applies; only baseline-known semanticColors / spacing keys are accepted
• /bootstrap-from-figma skill extracts colors + spacing only. Patterns are intentionally decoupled.

2. Patterns platformization — project-local, on demand

• Removed the 8 starter patterns from omit-design init. New projects start with empty patterns/
• Removed --starters flag, importStarters handler, POST /__omit/starters/import endpoint, Library "Import 8 starters" button, "Suggested from Figma" panel
• New /distill-patterns-from-prd skill — reads a PRD, reuses existing patterns where possible, writes new ones only for gaps; HARD-GATEs on user review
• /add-pattern conversational mode — 5 fixed questions when no PRD
• /new-design HARD-GATE rewritten: auto-invokes distill (with PRD) or add-pattern conversational (without PRD) when patterns/ is empty
• "Distill patterns from this PRD" button in PRDs tab

Docs swept: README, preset-mobile/README, dev-server/README, eslint-plugin/README, PATTERNS.md, CONTRIBUTING, docs/architecture, docs/release no longer mention 8 patterns, --starters, or patterns.config.json (already removed in 0.3.x).

Test plan

• bun run build — all packages green (engine + dev-server + cli + preset-mobile + playground)
• omit-design init <name> → patterns/ contains only .gitkeep
• New stdout walks user through PRD → Distill → Claude Code → new-design flow
• GET /__omit/bootstrap returns {"payload":null} initially
• PUT /__omit/bootstrap accepts payload without patterns field, round-trips clean
• POST /__omit/starters/import returns 404
• Skills list contains distill-patterns-from-prd
• Empty patterns/ project writing design/foo.tsx → require-pattern-components correctly fires (expected — must distill/add first)
• Bootstrap from Figma against figma.com/design/vBAblnUXNiC2JEwbfjcJLR/AI-Chat produces valid theme tokens (manual run earlier in session)

Breaking changes

See CHANGELOG.md → [Unreleased] section. Old projects with patterns/<8 dirs>/ work unchanged; old scripts hitting /starters/import get 404 with no replacement endpoint.

🤖 Generated with Claude Code