chore(runway): cherry-pick feat: cp-7.65.0 updated color of earn percentage CTA (#25749)

- feat: cp-7.65.0 updated color of earn percentage CTA (#25738)

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## **Description**
Updated coloring of Earn CTA
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also include relevant motivation and context. Have in mind the following
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2. What is the improvement/solution?
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## **Changelog**

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CHANGELOG entry: updated coloring of Earn CTA

## **Related issues**

Fixes: 

## **Manual testing steps**

```gherkin
Feature: my feature name

  Scenario: user [verb for user action]
    Given [describe expected initial app state]

    When user [verb for user action]
    Then [describe expected outcome]
```

## **Screenshots/Recordings**

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### **Before**

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### **After**

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<img width="456" height="82" alt="image"

src="https://github.com/user-attachments/assets/2f9a4386-fde8-43fc-89c0-40ce8b1e60cb"
/>

## **Pre-merge author checklist**

- [x] I've followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
Coding

Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
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## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Single UI styling change (text color) with no behavior, data, or
navigation logic modified.
> 
> **Overview**
> Updates the Wallet home `StakeButton` “Earn” CTA styling by changing
its label text color from `TextColor.Primary` to
`TextColor.Alternative`, affecting how the earn/APR percentage is
displayed.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
3757843. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->


[7c4514a](7c4514a)

Co-authored-by: Matthew Grainger <46547583+Matt561@users.noreply.github.com>

Author: runway-github[bot]

app/components/UI/Stake/components/StakeButton/index.tsx

@@ -179,7 +179,7 @@ const StakeButtonContent = ({ earnToken }: StakeButtonContentProps) => {
       testID={WalletViewSelectorsIDs.STAKE_BUTTON}
       style={styles.stakeButton}
     >
-      <Text color={TextColor.Primary} variant={TextVariant.BodyXSMedium}>
+      <Text color={TextColor.Alternative} variant={TextVariant.BodyXSMedium}>
         {renderEarnButtonText()}
       </Text>
     </TouchableOpacity>