…or unsupported asset like Linea DAI cp-7.75.0 (#29508)

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## **Description**
Fixes a bug where the stablecoin lending empty state CTA was rendered
for assets that weren't supported **but** were supported for the mUSD
conversion feature.
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## **Changelog**

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CHANGELOG entry: fixed bug where the stablecoin lending empty state CTA
was rendered for assets that weren't supported **but** were supported
for the mUSD conversion feature.

## **Related issues**

Fixes: 
- Github issue: #29504
- Jira ticket: [MUSD-725: Stablecoin lending empty state CTA rendered
for unsupported tokens (DAI
Linea)](https://consensyssoftware.atlassian.net/browse/MUSD-725)

## **Manual testing steps**

```gherkin
Feature: Stablecoin Lending Empty State CTA rendering behaviour

  Scenario: user does not see the stablecoin lending empty state CTA rendered
    Given user has Linea DAI balance > $0.01

    When user navigates to Linea DAI asset details screen
    And user dismisses the mUSD conversion CTA banner
    Then user does not see the stablecoin lending empty state CTA
```

## **Screenshots/Recordings**

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### **Before**

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### **After**

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https://github.com/user-attachments/assets/3f3d9d15-6ae0-47d9-a86c-2e72ed5d80a3

## **Pre-merge author checklist**

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- [x] I've followed [MetaMask Contributor
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Not required for external contributors.

#### Performance checks (if applicable)

- [ ] I've tested on Android
  - Ideally on a mid-range device; emulator is acceptable
- [ ] I've tested with a power user scenario
- Use these [power-user
SRPs](https://consensyssoftware.atlassian.net/wiki/spaces/TL1/pages/edit-v2/401401446401?draftShareId=9d77e1e1-4bdc-4be1-9ebb-ccd916988d93)
to import wallets with many accounts and tokens
- [ ] I've instrumented key operations with Sentry traces for production
performance metrics
- See [`trace()`](/app/util/trace.ts) for usage and
[`addToken`](/app/components/Views/AddAsset/components/AddCustomToken/AddCustomToken.tsx#L274)
for an example

For performance guidelines and tooling, see the [Performance
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## **Pre-merge reviewer checklist**

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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Small UI-logic change that only tightens CTA rendering conditions; low
chance of side effects beyond Earn CTA visibility.
> 
> **Overview**
> Fixes an Earn asset-details UI bug where the stablecoin lending *empty
state* CTA could appear for unsupported assets.
> 
> `EarnLendingBalance` now renders `EarnEmptyStateCta` only when the
token is part of the `STABLECOIN_LENDING` experience (in addition to the
existing checks for not being a receipt token and having no lending
positions), while still prioritizing the mUSD conversion CTA when
applicable.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
701ba31. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->