Fix search within "My Dandisets" to include owned/embargoed dandisets

[bendichter]

Summary

Fixes #2834.

Searching from the My Dandisets page silently fell through to the public search route, so results only ever showed public dandisets — the user's embargoed dandisets were omitted, and there was no way to search across them.

The backend already supports user=me + search + embargoed=true together (the dandiset list action runs get_queryset(), honoring user=me/embargoed, then applies the search filter). The bug was entirely in the frontend.

Changes

• DandisetSearchField.vue — performSearch now stays on the current route for the myDandisets page (previously only searchDandisets), instead of pushing to the public search route. This keeps the search scoped to the user's own dandisets.
• DandisetsPage.vue — added a searchActive computed (props.search || !!route.query.search). The search param is now sent whenever a search is active, not only on the dedicated public search view. Combined with the existing user: 'me' and embargoed: true params on this page, search now spans owned + embargoed dandisets. The "N results found" header and inline search-error alert use the same flag.
• MyDandisetsView.vue — empty state now shows "No results found in your dandisets." during a search, instead of the misleading "You haven't created any dandisets yet."

Testing

yarn lint and yarn type-check pass for the changed files. Opening as a draft to test signed-in behavior on the deploy preview, since signing in locally is difficult.

To verify:

1. Sign in, go to My Dandisets.
2. Search for a term that matches an embargoed dandiset you own.
3. Confirm the URL stays on /dandiset/my?search=..., the embargoed dandiset appears, and the result count is shown.

🤖 Generated with Claude Code

[bendichter]

I tested this and can confirm that it works. It correctly filters to only dandisets I own, and it includes embargoed dandisets. Anyone else's results will vary because it depends on what dandisets you as a user own

[yarikoptic]

FWIW, tried on preview - worked for me. Filed

• Frontend CI started to fail #2845

since ideally we get it all green before merging