…ation

Fix the -f flag implementation to properly enable all files display,
disable sorting, and handle color output correctly.

Changes:
- Correct UNSORTED_ALL constant from 'unsorted-all' to 'f'
- Fix color logic to honor explicit --color flag regardless of -f position
- Add French localization for ls-help-unsorted-all
- Add comprehensive integration tests for -f flag behavior

The explicit --color flag now always takes precedence over -f implicit
color disabling, matching expected CLI behavior.

Address maintainer feedback from PR uutils#8824 review:

1. test_f_flag_disables_sorting: Compare -f output with -a (sorted) and -U (unsorted)
   to prove sorting is actually disabled, not just that files appear in output

2. test_f_overrides_big_a: Rename from test_f_overrides_a_and_big_a and fix assertions
   to check for .. presence (distinguishes -f from -A) instead of .hidden (shown in both)

3. test_f_overrides_sort_flags: Use size-based files and explicit output comparisons
   to verify last-flag-wins behavior with deterministic ordering

4. test_big_u_overrides_f_sort: Use size-based files and verify -U participates
   in last-flag-wins by checking actual output order

All tests now properly validate flag interactions instead of just checking file presence.

The tests test_f_flag_disables_sorting, test_big_u_overrides_f_sort, and
test_f_overrides_sort_flags made incorrect assumptions that unsorted
directory order would always differ from sorted order. However,
fs::read_dir() returns entries in filesystem-dependent order which may
accidentally match sorted order on some filesystems.

Changes:
- Removed assertions comparing unsorted vs sorted outputs
- Added deterministic checks (e.g., verifying --sort after -f works)
- Added explicit order verification for size-sorted outputs
- Tests now verify flag precedence without relying on directory order

Fixes CI failures on Windows and SELinux platforms.

Quality checks passed:
- cargo fmt --check: ✓
- cargo clippy --test tests: ✓
- all 3 modified tests pass: ✓

Renamed test_big_u_overrides_f_sort to test_big_u_participates_in_sort_flag_wins
to accurately reflect that it tests -U with -S interactions, not -f.