[Projects] Add MiniAloha to Learning Projects page

[andrewy1n]

Problem

MiniAloha (AlohaMini-based dual-arm mobile platform) is not represented on /projects/learning-projects, so the public site omits a major exploratory stack (teleop, VLA, sensors, autonomy).

Scope

• Add a fourth projects entry: dual-arm mobile base, motorized lift, LeRobot arms; snack / workday POC; “separate exploratory” framing for teleop + VLA + sensor integration in an autonomous system.
• Link to AlohaMini.
• Ship with a .glb when available, or use ModelViewer fallbackImage until a model exists.
• Update page <SEO> description if it still only lists Pupper / ARCTOS / SO101.

Acceptance Criteria

• Section matches visual hierarchy of existing learning rows.
• External link(s) work and are correctly attributed.
• SEO metadata reflects the expanded roster when applicable.

Files

• src/pages/Projects/LearningProjects.tsx
• src/pages/Projects/components/LearningProjectSection.tsx (if new props are required)
• src/assets/ (image or model when ready)

Related

• Depends on or overlaps [Projects] Extend LearningProjectSection (status, humanoid bridge, links) #169 if structured fields are required for links/highlights.