Add Onboarding page + restructure team-knowledge detail panel

[bbeatricecretu]

Summary

• Adds /onboarding route — a flat catalog of every graduated prompt and every learning (durable + draft), so a new teammate can see all prompting patterns at once without clicking through the tree. Replaces the old "Behavioral metrics" home-page link.
• Restructures the Team's-knowledge tree DetailPanel into three clearly-labeled sections with bigger neutral headings: Onboarding info (prompts) · Learnings (durable + draft, with status pill) · Description of project (cumulative narrative from root → current folder).
• Adds author attribution to every prompt card (✍ name), so newcomers can see who wrote each prompt. API + shared types updated to surface prompts.author_user_id on /wiki/tree.
• Tones down the rainbow color tinting — color is now reserved for true status (best, durable, draft); paths/topics/reuse counts use neutral muted chips.

Test plan

• cd apps/dashboard && npm run dev and open http://localhost:3001
• Click any team → see new "Onboarding" button (replaces "Behavioral metrics")
• On /onboarding: verify the summary strip + two sections (Graduated prompts, All team patterns) render with all entries
• On /wiki: click a tree node → verify the three new sections (Onboarding info, Learnings, Description of project) render with the bigger headings
• Verify author chips show on every prompt card (✍ ana, ✍ marco, etc., or ✍ anonymous for legacy rows)

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
learnloop	Blocked		Apr 26, 2026 6:17am
polihackwinners-dashboard	Blocked		Apr 26, 2026 6:17am