[Projects] Extend LearningProjectSection (status, humanoid bridge, links)

[andrewy1n]

Problem

LearningProjectSection only supports a single title + paragraph + 3D viewer. We need structured slots for progress, “connection to humanoid,” and external links without cramming everything into one block.

Scope

• Extend props / layout for optional highlights (short bullets or secondary body).
• Optional Connection to humanoid block (e.g. CardTitle + BodyText, or a single ProjectDetailCard-style row for parity with the Humanoid page).
• Optional links (label + href) for outbound URLs (Arctos site, AlohaMini GitHub, etc.).
• Keep existing projects working; match responsive rhythm of the current page.

Acceptance Criteria

• All current learning sections render correctly with the new API (default optional fields).
• No raw h1–h6 or p tags—use shared Typography components.
• npm run lint and npm run typecheck pass.

Files

• src/pages/Projects/components/LearningProjectSection.tsx
• src/pages/Projects/LearningProjects.tsx

Related

• Coordinate with [Projects] Refresh Learning Projects copy (Pupper, ARCTOS, SO101) #168 (copy can land in plain text first, then migrate into new fields).