…TA to "Trade now" (RWDS-1335) cp-7.79.0 (#30740)

## **Description**

Replaces the **"Open Position"** copy on the Perps Trading Competition
opted-in CTA with **"Trade now"**, per
[RWDS-1335](https://consensyssoftware.atlassian.net/browse/RWDS-1335).

Scope is intentionally copy-only:
- `locales/languages/en.json` —
`rewards.perps_trading_campaign.open_position_cta` value.
-
`app/components/UI/Rewards/components/Campaigns/PerpsTradingCampaignCTA.tsx`
— comment updated to match.
-
`app/components/UI/Rewards/components/Campaigns/PerpsTradingCampaignCTA.test.tsx`
— mock value, test name, and rendered-text assertion.

No behavior, navigation, or analytics changes — the CTA still deep-links
to `link.metamask.io/perps?screen=market-list`.

## **Changelog**

CHANGELOG entry: null

## **Related issues**

Fixes:
[RWDS-1335](https://consensyssoftware.atlassian.net/browse/RWDS-1335)

## **Manual testing steps**

```gherkin
Feature: Perps Trading Competition CTA copy

  Scenario: Opted-in user sees the renamed CTA
    Given I am opted in to the Perps Trading Competition campaign
    And the campaign is active
    When I open the Rewards campaigns view
    Then the campaign CTA reads "Trade now"
    And tapping it deep-links to the Perps market list
```

## **Screenshots/Recordings**

### **Before**

CTA: "Open Position"

### **After**

CTA: "Trade now"

## **Pre-merge author checklist**

- [x] I've followed MetaMask Contributor Docs and MetaMask Mobile Coding
Standards.
- [x] I've completed the PR template to the best of my ability
- [x] I've included tests if applicable
- [ ] I've documented my code using JSDoc format if applicable
- [ ] I've applied the right labels on the PR

[RWDS-1335]:
https://consensyssoftware.atlassian.net/browse/RWDS-1335?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ
[RWDS-1335]:
https://consensyssoftware.atlassian.net/browse/RWDS-1335?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Copy-only change to an existing i18n string and tests; navigation and
campaign logic are unchanged.
> 
> **Overview**
> Renames the opted-in **Perps Trading Competition** primary CTA label
from **"Open Position"** to **"Trade now"** via
`rewards.perps_trading_campaign.open_position_cta` in English
(`en.json`). The component still uses the same i18n key and
`handleOpenPosition` still deep-links to
`link.metamask.io/perps?screen=market-list`; only the displayed string
and an inline comment change. Unit tests update the i18n mock, test
description, and on-screen text assertion to match.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
a5c865b. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>