Rework mobile terminal layout for deliberate secondary intervention use #236

Goal

Prioritize readable output, compact soft keys, recovery status, and easy exit back to fleet health instead of desktop-like density.

Scope

• Optimize for one-handed review, approval, and short intervention before full terminal use.
• Keep the default view comprehensible under slow, disconnected, or partially recovered fleet state.

Acceptance

• Prioritize readable output, compact soft keys, recovery status, and easy exit back to fleet health instead of desktop-like density.
• Use semantic controls with touch targets and keyboard-accessible equivalents.
• Add DOM-level tests for loading, failure, and success states.

Verification

• npm --prefix frontend test && npm --prefix frontend run build

Dependencies

#234