Verified package release

Package 0.5.1 is available. Protocol 0.2 remains provisional.

Canonical page: https://jg-plans.jesusgraterol.dev/examples/

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## Milestone 1: Explain empty results
**Status:** done
**Milestone ID:** 3c7a2f1e-9b4d-4e8a-a6f2-1d5c7e9b0a34
**Acceptance criteria:** AC-01

Add the explanation to the empty results view. Review it in both themes.

## Milestone 2: Offer a next action
**Status:** in progress
**Milestone ID:** 8e1d6b2a-4f7c-4a3e-b9d1-6c2e8f4a7b15
**Acceptance criteria:** AC-02, AC-03

Add the clear-filters action, then check it with a keyboard and a screen reader.