Add synonym expansion to component lexical search

[Mbeaulne]

Description

Adds a synonym expansion system to the component lexical search so that queries using common aliases resolve to the intended components. For example, searching gcs now surfaces storage-related components, fit surfaces training components, infer surfaces prediction components, and df surfaces dataframe/table components.

A new componentSearchSynonyms.ts module defines synonym groups (e.g. gcs ↔ storage ↔ bucket, train ↔ fit, predict ↔ infer, df ↔ dataframe ↔ table) and exposes expandSynonymTokens, which fans out any recognized token into all members of its group.

The search pipeline was also refactored to separate base tokenization (baseSearchTokens) from the full normalized text used for document indexing. Synonym expansion is applied to query tokens before scoring, and the phrase-match bonus now uses the original (pre-expansion) token sequence so multi-word phrase matching remains accurate.

Related Issue and Pull requests

Type of Change

• Bug fix
• New feature
• Improvement
• Cleanup/Refactor
• Breaking change
• Documentation update

Checklist

• I have tested this does not break current pipelines / runs functionality
• I have tested the changes on staging

Screenshots (if applicable)

Test Instructions

1. Open the component search panel.
2. Search for gcs and confirm storage/bucket components appear at the top.
3. Search for fit and confirm model training components appear.
4. Search for infer and confirm prediction components appear.
5. Search for df and confirm dataframe/table components appear.
6. Verify that multi-word phrase matching (e.g. train test split) still correctly ranks exact name matches above partial matches.

Additional Comments

The synonym groups are intentionally domain-neutral and kept in a single flat list in componentSearchSynonyms.ts to make it easy to extend with additional aliases in the future. THIS IS NOT AN EXHAUSTIVE LIST

[Mbeaulne]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Debounce component search input #2433
• add client-side embeddings cached in IndexedDB #2432
• Add search quality expectation tests for lexical search #2431
• Add deep AI search to rerank all components in selected sources #2430
• Add source-diverse AI rerank candidate pool #2429
• Add negative constraint parsing to lexical search #2428
• Add fuzzy/typo-tolerant matching for component name and I/O fields #2427
• Improve component search scoring relevance #2426
• Add synonym expansion to component lexical search #2425 👈 (View in Graphite)
• Normalize component search tokens for better matching #2424
• Expand component search indexing fields #2423
• master

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