feat: add library flag for all ns filtering

[jahvon]

Summary

By default only show executables in the root namespace with options to show all namespaces. Includes improvements for ref displays in the library view.

Change Type

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation update
• [ ] Other (please describe):

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 9.80392% with 46 lines in your changes missing coverage. Please review.

Project coverage is 36.17%. Comparing base (29daebf) to head (2854f5f). Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/internal/library.go	11.11%	16 Missing :warning:
types/executable/ref.go	0.00%	9 Missing :warning:
internal/io/library/styles.go	0.00%	7 Missing :warning:
internal/io/library/view.go	0.00%	6 Missing :warning:
tests/utils/sub_execs.go	0.00%	4 Missing :warning:
internal/io/library/init.go	0.00%	3 Missing :warning:
types/executable/executable.go	0.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #164 +/- ## ========================================== - Coverage 36.41% 36.17% -0.24% ========================================== Files 81 81 Lines 5682 5705 +23 ========================================== - Hits 2069 2064 -5 - Misses 3207 3236 +29 + Partials 406 405 -1 ```

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