Add logical inset utilities (inset-s, inset-e, inset-bs, inset-be) (tailwindlabs#19613)

## Summary

This PR adds support for logical inset utilities that map to CSS logical
properties:

- `inset-s` → `inset-inline-start`
- `inset-e` → `inset-inline-end`
- `inset-bs` → `inset-block-start`
- `inset-be` → `inset-block-end`

These utilities complement the existing `inset-x` (inline) and `inset-y`
(block) utilities, providing more granular control over positioning in a
direction-aware manner. This aligns with CSS logical properties and
improves support for internationalization (RTL/LTR languages).

### Changes

1. **property-order.ts**: Added `inset-block-start` and
`inset-block-end` to the property ordering list to ensure consistent
cascade ordering
2. **utilities.ts**: Added four new utility mappings for the logical
inset properties
3. **utilities.test.ts**: Added comprehensive test coverage for all four
new utilities, including:
- Valid class generation with various value types (custom spacing,
percentages, arbitrary values)
   - Negative value support
   - Invalid class rejection (malformed syntax, invalid modifiers)

## Test plan

All changes are covered by unit tests in `utilities.test.ts`:
- `inset-s` test: 8 valid classes + 13 invalid class assertions
- `inset-e` test: 8 valid classes + 13 invalid class assertions  
- `inset-bs` test: 8 valid classes + 13 invalid class assertions
- `inset-be` test: 8 valid classes + 13 invalid class assertions

Each test verifies correct CSS output generation and proper rejection of
malformed utilities.

https://claude.ai/code/session_01JcYXVAMawRuntKatjku1WZ

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Robin Malfait <malfait.robin@gmail.com>

Author: 3 people

CHANGELOG.md

@@ -18,10 +18,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
-- Add `pbs-*`, `pbe-*`, `mbs-*`, `mbe-*`, `scroll-pbs-*`, `scroll-pbe-*`, `scroll-mbs-*`, `scroll-mbe-*`, `border-bs-*`, `border-be-*` utilities for `padding-block-start`, `padding-block-end`, `margin-block-start`, `margin-block-end`, `scroll-padding-block-start`, `scroll-padding-block-end`, `scroll-margin-block-start`, `scroll-margin-block-end`, `border-block-start`, and `border-block-end` ([`#19601`](https://github.com/tailwindlabs/tailwindcss/pull/19601))
 - _Experimental_: Add `@container-size` utility ([#18901](https://github.com/tailwindlabs/tailwindcss/pull/18901))
 - Add `@tailwindcss/webpack` loader for Tailwind CSS v4 ([#19610](https://github.com/tailwindlabs/tailwindcss/pull/19610))
+- Add `pbs-*`, `pbe-*`, `mbs-*`, `mbe-*`, `scroll-pbs-*`, `scroll-pbe-*`, `scroll-mbs-*`, `scroll-mbe-*`, `border-bs-*`, `border-be-*` utilities for `padding-block-start`, `padding-block-end`, `margin-block-start`, `margin-block-end`, `scroll-padding-block-start`, `scroll-padding-block-end`, `scroll-margin-block-start`, `scroll-margin-block-end`, `border-block-start`, and `border-block-end` ([`#19601`](https://github.com/tailwindlabs/tailwindcss/pull/19601))
 - Add `inline-*`, `min-inline-*`, `max-inline-*`, `block-*`, `min-block-*`, `max-block-*` utilities for `inline-size`, `min-inline-size`, `max-inline-size`, `block-size`, `min-block-size`, and `max-block-size` ([#19612](https://github.com/tailwindlabs/tailwindcss/pull/19612))
+- Add `inset-s-*`, `inset-e-*`, `inset-bs-*`, `inset-be-*` utilities for `inset-inline-start`, `inset-inline-end`, `inset-block-start`, and `inset-block-end` ([#19613](https://github.com/tailwindlabs/tailwindcss/pull/19613))
+
+### Deprecated
+
+- Deprecate `start-*` and `end-*` utilities in favor of `inline-s-*` and `inline-e-*` ([#19613](https://github.com/tailwindlabs/tailwindcss/pull/19613))
 
 ## [4.1.18] - 2025-12-11