Story 3: Portfolio builder UI on profile

[jeromehardaway]

Epic: #1155
Story Points: 5
Priority: High
Dependencies: Story 1, Story 2

User Story

As a veteran who finished the portfolio checklist
I want to add and edit projects from my profile
So that I can assemble a portfolio without external tools

Acceptance Criteria

• A "Projects" / "Proof of Work" section on the profile with add / edit / delete
• Form fields: title, summary, repo URL, live URL, tech tags, screenshot (Story 2)
• Reorder projects (drag or up/down); persists order
• Form validation with inline errors; clear loading/saved state
• Mobile-responsive; full keyboard navigation and labelled controls (Biome a11y rules are errors)
• Cross-link from src/pages/portfolio-checklist.tsx "Proof of Work" into the builder

Technical Notes

• Reuse src/components/forms/** and product-card-style cards — don't hand-roll new form primitives
• Tailwind tw- prefix mandatory; brand tokens, not raw palette
• Calls the CRUD API from Story 1

Definition of Done

• Add / edit / delete / reorder all work against the API
• Accessible (keyboard + screen reader); responsive at mobile and desktop
• Component/integration tests for the main path; typecheck / lint / test pass; reviewed and merged