fix: prevent partial matches for exact token searches

[NishadA05]

Fixes #1351

Summary

Fixes an issue where searching for an exact-looking token could return results even when that exact token was not in the knowledge base.

For example, searching ZX-49-RAG could return a document containing ZX-4819-RAG because the search matched similar token pieces.

This change keeps the existing search behavior, but adds a final check for code/token-like queries. If the exact query text is not found in the returned filename or chunk text, the result is removed.

Testing

Manually tested in Project Knowledge search:

• Document contains ZX-4819-RAG

• Search ZX-49-RAG

  • Result: no results returned

• Search ZX-4819-RAG

  • Result: Project.code.for.QA.validation.is.ZX.docx returned

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