Pre-v0.7.0 Cleanup: Sorting, Efficiency, and Bug Fixes

[peczenyj]

This PR performs a comprehensive cleanup before starting v0.7.0 work:

• Modernized sorting: Replaced sort.Slice with Go 1.25 slices.SortFunc for better type safety and performance. (Closes Modernize sorting using Go 1.25 slices package #67)
• Improved efficiency: Pre-allocated the filtered slice in stripEggFlags to avoid re-allocations. (Closes Improve stripEggFlags efficiency in internal/app/app.go #66)
• Anonymous struct fix: Enhanced -skip-cache-padded to correctly detect padding in anonymous structs. (Closes Support -skip-cache-padded for anonymous structs #65)
• Documentation polishing: Fixed a typo in README.md and refined the indent helper for cleaner output.

All tests passed in task ci.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 87.17949% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.73%. Comparing base (297c521) to head (3eaf26a).

Files with missing lines	Patch %	Lines
internal/app/app.go	78.57%	2 Missing and 1 partial ⚠️
internal/align/align.go	90.90%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel      #68      +/-   ##
==========================================
+ Coverage   93.17%   94.73%   +1.56%     
==========================================
  Files          12       12              
  Lines         908      931      +23     
==========================================
+ Hits          846      882      +36     
+ Misses         34       28       -6     
+ Partials       28       21       -7     

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