Issue 33882 primeng update dynamic colors

[hmoreras]

Proposed Changes

• Clarified that secondary CSS variables are updated dynamically via setColor() method
• Documented that Angular components using CSS variables directly (e.g., bg-(--color-palette-secondary-200)) receive dynamic updates
• Explained the distinction between PrimeNG semantic tokens (preset only) vs CSS variables (dynamic)
• Updated comments in updatePrimeNGColors() to explain why secondary semantic tokens aren't updated
• Updated theme.config.ts comments to clarify secondary behavior

This PR fixes: #33882

This PR fixes: #33882

[semgrep-code-dotcms-test]

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GPL-2.0

• node-forge 1.3.1

MPL-2.0

• axe-core 4.11.0
• lightningcss 1.30.2
• lightningcss-darwin-arm64 1.30.2
• axe-core 4.11.1
• lightningcss-android-arm64 1.30.2
• lightningcss-darwin-arm64 1.30.2
• lightningcss-darwin-x64 1.30.2
• lightningcss-freebsd-x64 1.30.2
• lightningcss-linux-arm-gnueabihf 1.30.2
• lightningcss-linux-arm64-gnu 1.30.2
• lightningcss-linux-arm64-musl 1.30.2
• lightningcss-linux-x64-gnu 1.30.2
• lightningcss-linux-x64-musl 1.30.2
• lightningcss-win32-arm64-msvc 1.30.2
• lightningcss-win32-x64-msvc 1.30.2
• lightningcss 1.30.2