feat: add search and diagnosis filter to history page (#21)

[pericharlabindhumadhavi-data]

Closes #21

Problem

The Patient History page loaded all records in a flat table with no way to search or filter. Finding a specific patient required manually scrolling through every record — not practical in a clinical environment.

Fix

Added client-side search and filter functionality:

• Search input to filter records by filename
• Dropdown to filter by diagnosis: All / Healthy / Diabetic Retinopathy
• Both filters work together on already-fetched data (no extra API calls)
• Shows "No records match your search." when filters return nothing

Files Changed

• src/app/history/page.tsx

Screenshots

[vercel]

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