fix(utils): remove trailing decimal point in getRoundedAmount

[jaffarkeikei]

Problem

getRoundedAmount returns values with trailing decimal points when all decimal
digits are zeros after rounding:

  getRoundedAmount('5.00001', 2)  // Returns "5." ❌                             
  getRoundedAmount('10.00', 2)    // Returns "10." ❌                            
  getRoundedAmount('100.0', 1)    // Returns "100." ❌                           

This causes malformed number strings to be displayed in the UI.

Solution

Changed the regex from /0+$/ to /.?0+$/ to also strip the trailing decimal
point when present.

  getRoundedAmount('5.00001', 2)  // Returns "5" ✓                               
  getRoundedAmount('10.00', 2)    // Returns "10" ✓                              
  getRoundedAmount('100.0', 1)    // Returns "100" ✓                             

Testing

Added test case removes trailing decimal point when all decimal digits are
zeros.

[vercel]

@jaffarkeikei is attempting to deploy a commit to the Coinbase Team on Vercel.

A member of the Team first needs to authorize it.

[cb-heimdall]

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