[Projects] Learning Projects gallery: project-specific media

[andrewy1n]

Problem

LearningProjects.tsx wires ProjectGallery to humanoid gallery assets, which is misleading for a page about Pupper, arms, and MiniAloha.

Scope

• Add project-specific media under src/assets/projects/ (compressed WebP/JPEG as appropriate) for Pupper, ARCTOS, SO101, and MiniAloha when photos exist.
• Point galleryImages at those imports (or split galleries only if design requests it).
• Ensure alt text / accessibility expectations are met wherever the gallery consumes images.

Acceptance Criteria

• Gallery imagery matches the robots described on the page (or is clearly labeled club photography if reusing general shots).
• npm run build and lint pass; assets are reasonably sized for web.

Files

• src/pages/Projects/LearningProjects.tsx
• src/assets/projects/

Non-goals

• Blocking on perfect photos—can ship incrementally as assets arrive.