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chore: Clean up remaining Tailwind code (#45925)

This PR finishes the Tailwind migration by doing some minor fixes:
- Remove `@radix-ui/colors` and inline the color values into the color
definitions. The default Tailwind colors are unset and replaced by our
own color set (both in light and dark variants).
- Remove the `colorA` colors because they were used with alpha values.
They were unused and Tailwind v4 supports alpha values natively.
- Replace the `hit-area` JS config with the original CSS config from
https://bazza.dev/craft/2026/hit-area. The original config was migrated
to JS config to work with Tailwind v3. Now that we're on v4, we can just
use the source format.
- Remove the `motion-safe-transition` plugin since it's now [supported
natively by
Tailwind](https://tailwindcss.com/docs/transition-duration#supporting-reduced-motion)
- Replace `tailwindcss-animate` with `tw-animate-css`. The old plugin
was unmaintained and using JS config. The new one should be a drop-in
replacement.
- Remove all scripts for generating colors, they're not needed anymore,
all values are hardcoded.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **New Features**
* Added hit-area debugging and sizing utilities for enhanced layout
control.

* **Refactor**
* Restructured color system to use hand-edited CSS variables with
inlined values for improved performance and maintainability.
  * Migrated animation utilities to a new framework.

* **Style**
* Enhanced motion-reduced animations with improved transition behavior.
  * Adjusted sidebar layout styling for better visual presentation.

* **Chores**
  * Updated animation dependencies.
  * Removed legacy color generation scripts.

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