refactor: improve type safety in aiSummarization by eliminating explicit any

[DebasmitaBose0]

Closes #334

Summary

Resolved explicit any typing issues.

Changes Made

• Refactored normalizeArray to accept unknown.
• Typed safeJSONParse return signature as Record<string, unknown>.

Testing

• Ran type checking locally with npx tsc --noEmit.
• Run eslint checks to verify @typescript-eslint/no-explicit-any errors are cleared.

Impact

Enforces compile-time type safety.

Checklist

• Code follows project standards
• Tested locally
• No unrelated changes included
• Responsive design verified
• Accessibility considered

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