[WIP] Add support for %-30s in Dmod_SnPrintf

[Copilot]

Implementation Plan for %-30s Format Support

• Analyze the current Dmod_VSnPrintf_Impl implementation in dmod_prf.c
• Add support for parsing width specifier (e.g., 30 in %-30s)
• Add support for parsing alignment flag (e.g., - for left-align in %-30s)
• Modify Dmod_Print_String to handle width and alignment for strings
• Write comprehensive tests for the new functionality
• Build and test the changes
• Verify the fix with the example from the issue
• Address code review feedback:
  • Fixed negative padding length handling
  • Added overflow protection for width parsing (max 1024)
• Final security review

Original prompt

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This section details on the original issue you should resolve

<issue_title>Dmod_SnPrintf nie wspiera %-30s</issue_title>
<issue_description>Trzeba dodać wsparcie dla tego tagu, aby to działało:

stm32f746xg@/> module list
Available modules:
%-30s %-15s %-40s
---------------------------------------------------------------------------------------------
%-30s %-15s %-40s
%-30s %-15s %-40s
%-30s %-15s %-40s
%-30s %-15s %-40s
%-30s %-15s %-40s
%-[B[B[B[B[B[B[B[B[B[B[B[B[B[B

```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes Dmod_SnPrintf nie wspiera %-30s #186

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