Fix border shortcomings: Add separate border utilities for bb-2, bt-2, by-2,etc (#41371) #41377
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Description
This PR adds utility classes for setting individual border widths (top, bottom, left, right, start, end, x, y) using concise class names such as .bt-2, .bb-1, .bs-3, etc. These follow the pattern and spirit of existing spacing utilities (mt-2, mb-4, etc.), but for border thickness.
Motivation & Context
Currently, Bootstrap does not provide utility classes for customizing individual border widths beyond the default border shorthand classes. This makes it inconvenient to adjust specific borders (e.g., only the bottom) with different widths. This PR fixes that gap by allowing consistent and granular border width utilities—similar to how margin/padding work.
Type of changes
Checklist
npm run lint
)Live previews
Related issues
Fixes #41371