chore(runway): cherry-pick chore: fix apr issue with znon-zero values cp-7.61.6 (#24261)

- chore: fix apr issue with znon-zero values cp-7.61.6 (#24248)

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## **Description**

Updated APR fallback logic from nullish coalescing (`??`) to check if
`aprOverride` is a valid non-zero value, preventing "0%" from overriding
a legitimate `earnToken.experience.apr`.

## **Changelog**

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## **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]
```

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## **Pre-merge author checklist**

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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Adjusts APR display logic in `getStakingNavbar` for Tron staking.
> 
> - Use `aprOverride` only when its parsed numeric value is > 0;
otherwise fall back to `earnToken.experience.apr` with one-decimal
formatting and `%`
> - Introduces `parsedOverride` helper to parse the override before
deciding the source
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
dfde6e9. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->


[541e3ad](541e3ad)

Co-authored-by: António Regadas <antonio.regadas@consensys.net>

Author: runway-github[bot]

app/components/UI/Navbar/index.js

@@ -2124,9 +2124,11 @@ export function getStakingNavbar(
   }
 
   ///: BEGIN:ONLY_INCLUDE_IF(tron)
+  const parsedOverride = aprOverride ? parseFloat(aprOverride) : 0;
   const apr =
-    aprOverride ??
-    `${parseFloat(earnToken?.experience?.apr ?? '0').toFixed(1)}%`;
+    parsedOverride > 0
+      ? aprOverride
+      : `${parseFloat(earnToken?.experience?.apr ?? '0').toFixed(1)}%`;
   ///: END:ONLY_INCLUDE_IF
 
   return {