feat(deeplinks): add Swap, Rewards, Predict, Earn-musd, Shield, Trending to WHITELISTED_ACTIONS (#29264)

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## **Description**

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Adds six missing actions to `WHITELISTED_ACTIONS` in
`handleUniversalLink.ts` so that deeplinks to these features bypass the
interstitial modal, consistent with how similar actions (e.g. `PERPS`,
`BUY`, `CARD_ONBOARDING`) are already handled.

**Actions added (in `SUPPORTED_ACTIONS` order):**
- `SWAP` — inserted after `DAPP`, before `WC`
- `REWARDS` — inserted after `PERPS_ASSET`, before `BUY`
- `PREDICT` — inserted after `REWARDS`, before `BUY`
- `TRENDING` — inserted after `SELL_CRYPTO`
- `SHIELD` — inserted after `TRENDING`
- `EARN_MUSD` — inserted after `SHIELD`

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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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### **After**

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- [ ] I've followed [MetaMask Contributor
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#### 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
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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

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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Medium Risk**
> Changes deep link safety/interstitial behavior by allowing additional
actions (including `swap`) to bypass the “Proceed with caution” modal,
which could affect user protection flows if mis-scoped. Logic is simple
but touches a security-adjacent gate used for all universal links.
> 
> **Overview**
> Updates `handleUniversalLink` to expand `WHITELISTED_ACTIONS` so
deeplinks for **Swap, Rewards, Predict, Trending, Shield, and Earn
MUSD** skip the interstitial modal (while still tracking analytics as a
non-interstitial flow).
> 
> Adjusts tests accordingly: unit tests now use `send` as the
representative non-whitelisted action for modal/signature scenarios, and
the swap deeplink smoke test no longer expects/dismisses the “Proceed
with caution” modal.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
8112ffc. 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: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Baptiste Marchand <baptiste-marchand@users.noreply.github.com>

Author: baptiste-marchand