refactor: replace kleur with Node.js native styleText

[rahuld109]

Summary

Removes the kleur dependency by using Node.js native styleText from node:util.

Created a small utility (src/utils/styleText.js) that wraps styleText with a Proxy to support kleur's chainable API - so existing code like kleur.green().bold('text') keeps working without changes.

Also added unit tests covering the different usage patterns (chaining, number values, destructuring, etc).

Changes

• New src/utils/styleText.js utility
• Updated 8 files to import from the new utility
• Removed kleur from dependencies
• Added 12 unit tests

Testing

• All tests pass
• Lint passes

Closes #637

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.93%. Comparing base (28ee6a9) to head (7f5421d).
⚠️ Report is 292 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (28ee6a9) and HEAD (7f5421d). Click for more details.

HEAD has 3 uploads less than BASE

Flag	BASE (28ee6a9)	HEAD (7f5421d)
	6	3

Additional details and impacted files

@@             Coverage Diff              @@
##            master     #639       +/-   ##
============================================
- Coverage   100.00%   57.93%   -42.07%     
============================================
  Files           15       46       +31     
  Lines          649     3461     +2812     
  Branches         0       15       +15     
============================================
+ Hits           649     2005     +1356     
- Misses           0     1456     +1456     

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