bugfix: floating point precision issue

[utk09-NCL]

Fixes #407

Problem: 4.1M displayed as £NaN.1 due to JS floating-point precision errors.

Solution:

• Created safeMultiply utility using integer arithmetic
• Fixed parseAbbrValue and cleanValue to use safe multiplication
• Added comprehensive test coverage

Result: 4.1M now correctly displays as £4,100,000

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (396d57b) to head (9b2362d).
⚠️ Report is 30 commits behind head on main.
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Additional details and impacted files

@@            Coverage Diff            @@
##              main      #408   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           15        16    +1     
  Lines          414       409    -5     
  Branches       156       172   +16     
=========================================
- Hits           414       409    -5     

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[utk09-NCL]

@cchanxzy re:failing Playwright tests - it seems to have failed before with same error. Any suggestions/resolution? TIA!

[utk09-NCL]

Hi @cchanxzy, any updates regarding this? Thanks!