Empty states: commitments, marketplace, and attestations

[1nonlypiece]

Description

First-time and zero-result moments should teach the next action.

Scope

• Illustration vs icon choice; tone of voice for copy.
• Primary CTA per context (create, clear filters, connect wallet if applicable).

Acceptance criteria

• One spec template reusable across list views with content slots.
• Differentiation between “no data yet” vs “error” vs “filtered to zero”.