feat: AI Project Planner in global + Create dropdown

[Gardner-Programs]

Summary

• Adds ✨ AI Planner as a 4th option in the + Create dropdown (visible from any page)
• User describes what they want to build, sets sprint count (1–6), sprint length (1–4 weeks), and team size
• Claude generates a full multi-sprint plan with work items distributed logically: foundation first, core features in the middle, polish and testing at the end
• Preview step shows collapsible sprint cards — expand each to see its tasks, priorities, and story points
• "Create All Sprints & Tasks" commits everything to the selected project in one shot with live progress feedback

How it works

• AiProjectPlannerDialog — 4-step dialog (form → generating → preview → creating)
• generateProjectPlan() in ai.ts — sends a structured prompt to claude-haiku-4-5-20251001, parses the multi-sprint JSON response
• Items per sprint scaled to team size (~2× team size, capped at 3–12)
• Sprint creation is sequential (items need sprint IDs); items within each sprint are created in parallel

Test plan

• Click + Create → confirm "✨ AI Planner" appears as 4th option
• Fill in goal, adjust sliders, click "Generate Plan" — loading spinner appears
• Preview shows correct number of sprints with expandable task lists
• "← Regenerate" returns to form with fields intact
• "Create All Sprints & Tasks" shows per-sprint progress, then closes
• Sprints tab reflects the newly created sprints and items

Requires VITE_ANTHROPIC_API_KEY in .env (or Vercel environment variables)

🤖 Generated with Claude Code

[vercel]

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Project	Deployment	Actions	Updated (UTC)
plan-it	Ready	Preview, Comment	May 15, 2026 3:45pm