Future-Proof JSON Parsing + Security & UX Upgrade

🚀 Release v1.1.0 — Future-Proof JSON Parsing, Security Upgrade & UX Improvements

🔧 Major Changes

• Full rewrite of JSON parsing for follower/following files
• Now completely robust against future Instagram/Meta export changes
• No more hard-coded keys (string_list_data, relationships_following)
• Added recursive extract_href() to automatically detect profile URLs
• Updated algorithm.py to support all 2024–2025+ export formats

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🔒 Security & Privacy Enhancements

• Improved privacy text: processing is now clearly described as server-side volatile
• Added MAX_CONTENT_LENGTH (5MB) + handler for 413 RequestEntityTooLarge
• Added global no-store, no-cache headers for all sensitive routes
• Download now uses POST method instead of GET (CSRF-safe)
• Safe filename sanitization with secure_filename
• Improved JSON corruption detection (\x00, malformed structures)

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🎨 User Experience Improvements

• Drag & Drop system reworked:
  • Prevent accidental reset of already-chosen files
  • Prevent multi-file upload in a single slot
  • Added error-safe visual feedback
• Improved loader overlay during analysis
• Unified button styles (Download, Back to Home)
• Scroll list polished with smooth UI and glow effects
• Cleaner, clearer error and validation messages

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🛠 Fixes & Internal Improvements

• Better handling of altered Instagram JSON structure
• Stronger validation of followers_1.json and following.json
• Logging for detection of future Meta format changes
• Simplified algorithm logic and improved normalization functions
• Cleaner, more maintainable codebase

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📦 Summary

This release significantly improves:

• Reliability
• Privacy safety
• Compatibility with future Instagram changes
• User experience
• Overall app stability

Your Follower Checker is now ready for production-level stability and long-term support.

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