[CHAIN] refactor(ui): remove dead tokens from tailwind config

[alejandrobailo]

🔗 Part of Chained PRs

Main PR	#11532
Feature branch	feat/heroui-shadcn-migration
Phase	0 of 5 — Tailwind config cleanup
Depends on	— (first in chain)

Chain Overview

feat/heroui-shadcn-migration
  ├── Fase 0: tailwind config cleanup        ← this PR
  ├── Fase 1: skeleton/divider/spacer/card → shadcn
  ├── Fase 2: form controls → shadcn
  ├── Fase 3: compound components + hooks → shadcn
  ├── Fase 4: remove HeroUI provider/plugin/dependency
  └── Fase 5: components/ui → components/shadcn reorg

Context

Before migrating components off HeroUI, tailwind.config.js carries dead weight that would otherwise be migrated for nothing: unused color tokens, unused keyframes, and a silent bug.

Description

• Fix duplicate animation key: extend declared animation twice; in a JS object literal the second key silently overrides the first, so animate-fade-in, fade-out, expand, slide-in/out and collapse were never generated. The two maps are now merged, keeping only animations with real usages. This restores the fade-in of components/scans/cli-import-banner.tsx (its animate-fade-in class was a no-op until now).
• Remove unused color tokens: action, prowler.theme.{green,purple,orange,yellow}, prowler.grey.*, prowler.green.*, prowler.{black,white}.900, system.info.*, system.warning.*, system.severity.{critical,medium}, and unused success/error shades. Verified with repo-wide greps (including dynamic template-literal class construction — none found).
• Remove unused keyframes: accordion-down/up, advance, fade-out, slide-in/out, woosh, lineAnim, dropArrow.
• Remove dead class: dark:bg-prowler-theme-midnight in the attack paths node detail panel referenced a token that never existed — removing it is a zero-visual-change cleanup.

No component code is migrated in this PR; the HeroUI plugin and all used tokens remain untouched.

Steps to review

1. cd ui && pnpm run healthcheck — passes.
2. pnpm run build — passes.
3. Grep for any removed token (e.g. git grep prowler-grey ui/) — no usages exist.
4. Visual check: /scans CLI import banner now fades in; attack paths node detail sheet unchanged.

Checklist

• pnpm run typecheck / lint / format pass
• pnpm run build passes
• No behavior change beyond restoring the intended fade-in animation

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[pfe-nazaries]

Give a second check if this is used on ui/styles/globals.css:408