Fix skill parsing for skill names containing commas

[jwalkorat]

Summary

Fixed a bug where skill names containing commas were parsed incorrectly.

Previously, skills were stored as comma-separated strings. This caused problems when a skill itself contained commas, such as "HTML, CSS".

This PR updates the frontend to send skills using JSON.stringify() and updates the backend parser to safely reconstruct the original skill array using json.loads().

A fallback for the previous comma-separated format was also added to maintain backward compatibility.

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Related Issue

Closes #188

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Type of Change

• Bug fix — resolves a broken behaviour

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What Was Changed

File	Change made
static/script.js	Updated skill serialization to use JSON.stringify()
utils/recommender.py	Added JSON skill parsing with fallback support for old comma-separated strings

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How to Test This PR

1. Run the app:
   python app.py

2. Open:
   http://127.0.0.1:5000

3. Add a skill containing commas

Example:
HTML, CSS

4. Generate recommendations

5. Verify that:

• the skill is preserved correctly
• recommendations still work normally
• skills are not incorrectly split

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Test Results

Tested manually in browser.

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Self-Review Checklist

• I have read CONTRIBUTING.md and followed the guidelines
• I used the correct branch naming convention
• I did not add debug statements
• I only modified files related to this issue

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Notes for Reviewer

This implementation fixes the parsing issue without changing the overall recommendation architecture and keeps support for older comma-separated skill formats.

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