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- Added error state for API failures with user-friendly messages - Added loading state to indicate when operations are in progress - Wrapped all async operations (fetchFiles, loadFile, handleUpload) in try/catch - Added visual error banner with red styling - Added Loading indicator - Disabled controls during loading states - Validates data response format before rendering charts
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Summary
Adds proper error handling and loading states to prevent silent failures.
Changes
Why
Previously, failed requests would silently break the app with no feedback. Now users see clear messages if the backend is down or requests fail.