3. Filter Value Extraction Utility

[MitchellShiell]

Context
Once a developer has configured filter properties via customFilterDropdowns, the component needs to derive the available options for each dropdown by scanning the loaded schemas.

Goal
Implement a utility that accepts the array of schemas and the customFilterDropdowns config, and returns the unique values found at each configured dot-path across all schemas. These become the checkbox options rendered in each filter sub-dropdown.

Acceptance Criteria

• Dot-paths (e.g. meta.tags.submitter_type) are resolved correctly against a schema object
• Missing or undefined paths produce no option rather than an error
• Duplicate values are deduplicated