fix(decoder): Correctly unmarshal !!int tagged values

[rybakit]

This PR fixes the unmarshaling logic to properly handle YAML values with explicit !!int tags. For example:

var data map[string]int
err := yaml.Unmarshal([]byte("a: !!int 42"), &data)

Error returned:

Failed to process YAML: [1:4] cannot unmarshal int into Go value of type int
        >  1 | a: !!int 42
                  ^

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Codecov Report

Attention: Patch coverage is 39.28571% with 17 lines in your changes missing coverage. Please review.

Project coverage is 77.83%. Comparing base (25e5d90) to head (3b2de25).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #770      +/-   ##
==========================================
- Coverage   77.97%   77.83%   -0.14%     
==========================================
  Files          22       22              
  Lines        8108     8134      +26     
==========================================
+ Hits         6322     6331       +9     
- Misses       1370     1387      +17     
  Partials      416      416              

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[Copilot]

Pull request overview

This PR fixes the unmarshaling logic for YAML values with explicit !!int tags by introducing a new castToInt helper function that properly handles type conversions from various integer types and strings to int64/uint64.

• Replaces the previous strconv.Atoi(fmt.Sprint(v)) approach with a more robust type-switching conversion
• Adds comprehensive test coverage for integer tag handling including quoted strings and various numeric formats
• Updates float tag tests to use map[string]float64 instead of map[string]interface{} for consistency

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
decode.go	Adds castToInt function to properly handle type conversions for !!int tagged values, replacing the previous string-based conversion approach
decode_test.go	Adds test cases for various !!int tagged formats (quoted strings, hex, octal) and updates existing !!float tests for type consistency

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