Add unit tests for `links_add_target()`. Alter the patterns in `links_add_target()` and `_links_add_target()` slightly based on learnings after running tests.

Props mdbitz.
Fixes #26164.


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In `get_posts()`, alter the doc block and default args to make `orderby` equal to `date`, not `post_date`.

Props ounziw.
Fixes #26128.


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Use the correct shade of blue for the default filled progress bar color, 0074a2 to match the default scheme's highlight color. See #26147.
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Make disabled checkboxes and radios slightly less transparent for better visibility on low-contrast screens. Move this rule from colors-fresh to wp-admin as it's not color-specific. Fixes #26004.
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