Add ParseOrDefault overloads for all ParseOrNull extension types

[Copilot]

Each ParseOrNull extension returns null on failure, but callers often want a fallback value instead of a nullable. This adds ParseOrDefault overloads for all 9 types that return the caller-supplied defaultValue (defaulting to default(T)) rather than null.

Changes

• Extension methods (bool, int, long, double, decimal, Guid, TimeSpan, DateTime, DateTimeOffset):
  • Simple overload: ParseOrDefault(string? str, T defaultValue = default)
  • Format-parameterized overload where applicable (mirrors the existing ParseOrNull overload with format/style args, defaultValue appended as last optional param)
  • All delegate to the corresponding ParseOrNull via ?? defaultValue
• Tests: ParseOrDefault_Test added to each extension test class covering success, failure with implicit default, and failure with explicit default

Example

// Before: nullable unwrap required
int value = int.ParseOrNull("abc") ?? -1;

// After: direct non-nullable result
int value = int.ParseOrDefault("abc", -1);  // -1
int zero  = int.ParseOrDefault("abc");      // 0

// Also works with format parameters
int hex = int.ParseOrDefault("FF", NumberStyles.HexNumber, null, -1);

[codecov]

Codecov Report

❌ Patch coverage is 91.46341% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.48%. Comparing base (a15a0de) to head (65b9bbf).
⚠️ Report is 1 commits behind head on prime.

Files with missing lines	Patch %	Lines
PowerKit/Extensions/DateTimeExtensions.cs	50.00%	1 Missing ⚠️
PowerKit/Extensions/DateTimeOffsetExtensions.cs	50.00%	1 Missing ⚠️
PowerKit/Extensions/DecimalExtensions.cs	50.00%	1 Missing ⚠️
PowerKit/Extensions/DoubleExtensions.cs	50.00%	1 Missing ⚠️
PowerKit/Extensions/IntExtensions.cs	50.00%	1 Missing ⚠️
PowerKit/Extensions/LongExtensions.cs	50.00%	1 Missing ⚠️
PowerKit/Extensions/TimeSpanExtensions.cs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            prime      #43      +/-   ##
==========================================
- Coverage   94.63%   94.48%   -0.16%     
==========================================
  Files          82       82              
  Lines        1623     1705      +82     
  Branches      135      135              
==========================================
+ Hits         1536     1611      +75     
- Misses         65       72       +7     
  Partials       22       22              

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[Copilot]

Pull request overview

Adds ParseOrDefault companion overloads to the existing ParseOrNull parsing helpers, letting callers specify a fallback value (defaulting to default(T)) instead of working with nullable results.

Changes:

• Added ParseOrDefault(...) overloads for bool, int, long, double, decimal, Guid, TimeSpan, DateTime, and DateTimeOffset (including format/style/provider variants where applicable).
• Implemented all ParseOrDefault methods by delegating to ParseOrNull(...) ?? defaultValue.
• Added ParseOrDefault_Test coverage to each corresponding test class.

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
PowerKit/Extensions/BoolExtensions.cs	Adds bool.ParseOrDefault(string?, bool) wrapper over ParseOrNull.
PowerKit/Extensions/IntExtensions.cs	Adds int.ParseOrDefault (simple + styles/provider overload).
PowerKit/Extensions/LongExtensions.cs	Adds long.ParseOrDefault (simple + styles/provider overload).
PowerKit/Extensions/DoubleExtensions.cs	Adds double.ParseOrDefault (simple + styles/provider overload).
PowerKit/Extensions/DecimalExtensions.cs	Adds decimal.ParseOrDefault (simple + styles/provider overload).
PowerKit/Extensions/GuidExtensions.cs	Adds Guid.ParseOrDefault(string?, Guid) wrapper over ParseOrNull.
PowerKit/Extensions/TimeSpanExtensions.cs	Adds TimeSpan.ParseOrDefault (simple + format provider overload).
PowerKit/Extensions/DateTimeExtensions.cs	Adds DateTime.ParseOrDefault (simple + provider/styles overload).
PowerKit/Extensions/DateTimeOffsetExtensions.cs	Adds DateTimeOffset.ParseOrDefault (simple + provider/styles overload).
PowerKit.Tests/BoolExtensionsTests.cs	Adds ParseOrDefault_Test for bool parsing fallback behavior.
PowerKit.Tests/IntExtensionsTests.cs	Adds ParseOrDefault_Test for int parsing fallback behavior.
PowerKit.Tests/LongExtensionsTests.cs	Adds ParseOrDefault_Test for long parsing fallback behavior.
PowerKit.Tests/DoubleExtensionsTests.cs	Adds ParseOrDefault_Test for double parsing fallback behavior.
PowerKit.Tests/DecimalExtensionsTests.cs	Adds ParseOrDefault_Test for decimal parsing fallback behavior.
PowerKit.Tests/GuidExtensionsTests.cs	Adds ParseOrDefault_Test for Guid parsing fallback behavior.
PowerKit.Tests/TimeSpanExtensionsTests.cs	Adds ParseOrDefault_Test for TimeSpan parsing fallback behavior.
PowerKit.Tests/DateTimeExtensionsTests.cs	Adds ParseOrDefault_Test for DateTime parsing fallback behavior.
PowerKit.Tests/DateTimeOffsetExtensionsTests.cs	Adds ParseOrDefault_Test for DateTimeOffset parsing fallback behavior.

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