docs: note that platform colors keep a property on the loop (hold for #10305)

[MatiPl01]

Follow-up to #10328, to land together with platform color support (#10305), not before it.

The routing rules for platform-driven CSS transitions list the table, the callbacks and the iOS easing restriction, but not the shape a color value has to have. Only numeric colors reach the platform: parseValue accepts a color solely when value.isNumber(), and parsePlatformValues returns nothing when either endpoint fails to parse, so a PlatformColor on one end keeps the whole property on the animation loop.

Held as a draft on purpose. CSS does not support platform colors yet, so documenting how they route would describe something users cannot write. Once #10305 lands, this note belongs next to the other routing conditions, and the wording should be re-checked against whatever resolution that PR settles on.

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• docs/docs-reanimated/docs/guides/feature-flags.md

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📝 Walkthrough

Walkthrough

Updated the feature flags guide to document color transition routing. Transitions remain on the animation loop when either endpoint uses PlatformColor or DynamicColorIOS. Platform animation applies only to transitions between plain colors.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The description directly explains the documented routing behavior for platform-driven CSS color transitions.
Title check	✅ Passed	The title clearly summarizes the documentation change about platform colors remaining on the animation loop.

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[MatiPl01]

Not worth a standalone docs PR. The note is recorded on #10305 instead, so it lands with platform color support rather than describing something CSS cannot express yet.