chore(predict): cp-7.60.0 bump sell slippage to 3% (#23074)

<!--
Please submit this PR as a draft initially.
Do not mark it as "Ready for review" until the template has been
completely filled out, and PR status checks have passed at least once.
-->

## **Description**

<!--
Write a short description of the changes included in this pull request,
also include relevant motivation and context. Have in mind the following
questions:
1. What is the reason for the change?
2. What is the improvement/solution?
-->

Bump slippage for Sell orders to 3% (from 1.5%). This will help reducing
the failure rate.

## **Changelog**

<!--
If this PR is not End-User-Facing and should not show up in the
CHANGELOG, you can choose to either:
1. Write `CHANGELOG entry: null`
2. Label with `no-changelog`

If this PR is End-User-Facing, please write a short User-Facing
description in the past tense like:
`CHANGELOG entry: Added a new tab for users to see their NFTs`
`CHANGELOG entry: Fixed a bug that was causing some NFTs to flicker`

(This helps the Release Engineer do their job more quickly and
accurately)
-->

CHANGELOG entry: null

## **Related issues**

Fixes: https://consensyssoftware.atlassian.net/browse/PRED-327

## **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**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

### **Before**

<!-- [screenshots/recordings] -->

### **After**

<!-- [screenshots/recordings] -->

## **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).
- [x] I've completed the PR template to the best of my ability
- [x] I’ve included tests if applicable
- [x] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [x] I’ve applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Increase sell-order slippage to 3% and introduce separate buy/sell
slippage constants, applying them in order previews.
> 
> - **Polymarket provider**:
> - **Slippage constants**: Replace `SLIPPAGE` with `SLIPPAGE_BUY`
(1.5%) and `SLIPPAGE_SELL` (3%) in
`app/components/UI/Predict/providers/polymarket/constants.ts`.
> - **Order preview**: In
`app/components/UI/Predict/providers/polymarket/utils.ts`, use
`SLIPPAGE_BUY` for buy previews and `SLIPPAGE_SELL` for sell previews;
update imports accordingly.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
582821f. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: matallui

app/components/UI/Predict/providers/polymarket/constants.ts

@@ -11,7 +11,8 @@ export const FEE_COLLECTOR_ADDRESS =
 /**
  * Default slippage for market orders.
  */
-export const SLIPPAGE = 0.015; // 1.5%
+export const SLIPPAGE_BUY = 0.015; // 1.5%
+export const SLIPPAGE_SELL = 0.03; // 3%
 
 export const ORDER_RATE_LIMIT_MS = 5000;
 

app/components/UI/Predict/providers/polymarket/utils.ts

@@ -26,14 +26,15 @@ import type {
 } from '../types';
 import {
   ClobAuthDomain,
-  SLIPPAGE,
   EIP712Domain,
   FEE_PERCENTAGE,
   HASH_ZERO_BYTES32,
   MATIC_CONTRACTS,
   MSG_TO_SIGN,
   POLYGON_MAINNET_CHAIN_ID,
   ROUNDING_CONFIG,
+  SLIPPAGE_BUY,
+  SLIPPAGE_SELL,
 } from './constants';
 import { SafeFeeAuthorization } from './safe/types';
 import {
@@ -1151,7 +1152,7 @@ export const previewOrder = async (
       sharePrice: bestPrice,
       maxAmountSpent: makerAmount,
       minAmountReceived: takerAmount,
-      slippage: SLIPPAGE,
+      slippage: SLIPPAGE_BUY,
       tickSize: parseFloat(book.tick_size),
       minOrderSize: parseFloat(book.min_order_size),
       negRisk: book.neg_risk,
@@ -1184,7 +1185,7 @@ export const previewOrder = async (
     sharePrice: bestPrice,
     maxAmountSpent: makerAmount,
     minAmountReceived: takerAmount,
-    slippage: SLIPPAGE,
+    slippage: SLIPPAGE_SELL,
     tickSize: parseFloat(book.tick_size),
     minOrderSize: parseFloat(book.min_order_size),
     negRisk: book.neg_risk,