Handle team filters for empty search

[rbjornstad]

Summary

• use explicit filter.teams as the scope for empty search queries
• keep user-team defaults only when no team filter is provided
• preserve blank-search kind ranking for explicit team-scoped searches
• add focused tests for team-scoped empty search, type filtering, and ranking

Testing

• rtk go test ./internal/search
• rtk mise run test:unit
• rtk mise run fmt

[Copilot]

Pull request overview

This pull request adjusts the Bleve-backed search behavior so that empty search queries use an explicit filter.teams scope when provided, while still falling back to the user’s team defaults when no team filter is given. This fits the internal/search package’s responsibility for shaping query semantics and ranking before converting hits into GraphQL nodes.

Changes:

• Change empty-query behavior to scope results by filter.Teams when provided; otherwise use the user’s team slugs (and return empty when neither exists).
• Preserve empty-query kind boosting (TEAM before APPLICATION/JOB/…) for explicit team-scoped searches.
• Add focused unit tests covering explicit team scope for empty search, type filtering, and ranking.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
internal/search/bleve.go	Updates empty-query scoping logic and factors team filtering into a helper disjunction query.
internal/search/bleve_test.go	Adds unit tests for team-scoped empty search behavior, type filtering, and ranking order.