Update manual entry form: Add image upload, remove product name/cateory fields, improve error handling

[Charleschtsoi]

Update manual entry form: Add image upload, remove product name/cateory fields, improve error handling

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Note

Introduces a new manual entry flow focused on image + batch code, and adjusts error handling to seamlessly guide users when AI analysis fails.

• Integrates expo-image-picker (and expo-image-loader) to upload and preview a required product image; adds related styles and permission handling
• Replaces manual name/category fields with required Product Image and Batch Code plus Expiry Date; pre-fills batch code with scanned code and allows editing
• On AI analysis failure, suppresses error overlays, shows friendly guidance, and immediately opens the manual entry modal
• Manual submit computes status from expiry, sets name to Manual Entry, flags isManualEntry, and stores imageUri for potential future use
• Adds cancel/reset logic for manual modal state and updates UI copy/styles throughout App.js

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