Import template: negate uses float math

[anze555]

Describe your Environment
OS: Linux (via Docker)
Paisa Version: 0.7.0
App Variant: Desktop (browser)

Describe the bug
When importing, number negate "0.00000001" gets converted into -1e-8, which is then rejected by parser.

To Reproduce
Steps to reproduce the behavior:

1. Create a custom import template, upload any CSV file
2. Demonstrate use of "negate" function on a small amount, for example by using this template:

   2024/09/08 Test
       Assets:Test:Main Account  {{negate "0.00000001"}} ETH
       Equity:Opening Balances
   

3. Observe the output: -1e-8
4. If used as amount, ledger parser complains:

   -1e-8
   ^^^^^^^^^^^^^^^^^^^^^^
   Error: Unexpected char '-' (Note: inline math requires parentheses)
   

(of course, this is just a small example to reproduce buggy behavior - I encountered this problem when importing real data)

Expected behavior

• output should be -0.00000001

Workaround
If you know the number to be positive, you can just put - in front of the expression: -{{ROW.X}}. If it is always negative, {{replace ROW.X "-" ""}} helps. If uncertain, {{#if regexpTest ROW.X "-.*"}}{{replace ROW.X "-" ""}}{{else}}-{{ROW.X}}{{/if}} can be used. It is cumbersome though.

Screenshots

Awesome app by the way, the import works very nicely!