SvelteKit's capture-phase link interceptor fires before the component's
onclick handler, so e.preventDefault() was structurally too late to stop
iframe navigation in vitest-browser. Replacing the <a href> with a
<button type="button"> removes the href entirely — the interceptor never
fires — and the existing goto() mock in tests is sufficient.
Also splits the single view-all test into two focused it() blocks and
clears mocks in afterEach to prevent cross-test mock leakage.
Fixes#551
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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