Search fixes

[hawkeye217]

Proposed change

• Ensure semantic search is enabled before checking model download state. Users without semantic search enabled would see an endless spinner on the Explore page.
• Only clear similarity search filters when clicking the "x" in the Similarity Search pill. The old behavior cleared all the filters.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• The code has been formatted using Ruff (ruff format frigate)

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