feat: add suggestions to watchlist on marketlist UI (MetaMask#31650)

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## **Description**

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Add suggestions to the watchlist on market list UI. Should match
behavior on Perps Home, minus the collapsible "show more" button.

Fixes back navigation from asset details screen so that it navigates
correctly to Perps Home, or Market List, contextually.

Fixes search bar functionality on Market List Watchlist

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CHANGELOG entry: add suggested markets to watchlist on marketlist UI

## **Related issues**

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Fixes: n/a

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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> UI-only perps market list and watchlist component changes behind the
existing watchlist flag, with broad test coverage and no auth or
data-layer changes.
> 
> **Overview**
> **Perps market list watchlist mode** now mirrors Perps Home: when the
watchlist feature flag is on and the watchlist filter is active, the
screen always renders `PerpsWatchlistMarkets` with saved markets **and**
suggested markets—not only when the watchlist is empty. The list view
passes `enableShowMore={false}`, `showHeader={false}`, and wires row
taps through the existing `handleMarketPress` so `onMarketSelect`,
`navigateToMarketDetails`, and route `transactionActiveAbTests` behave
like the main market list.
> 
> **`PerpsWatchlistMarkets`** gains optional **`onMarketPress`**
(parent-owned navigation instead of internal `navigation.navigate`) and
**`enableShowMore`** (default `true`; when `false`, all watchlist rows
show with no expand/collapse). Both V1 and V2 honor `onMarketPress`.
> 
> Tests cover the new market-list watchlist flows and the new component
props.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
6ffb46b. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: gambinish

app/components/UI/Perps/Views/PerpsMarketListView/PerpsMarketListView.styles.ts

@@ -135,6 +135,12 @@ const styleSheet = (params: { theme: Theme }) => {
     animatedListContainer: {
       flex: 1,
     },
+    watchlistScrollContainer: {
+      flex: 1,
+    },
+    watchlistScrollContent: {
+      paddingBottom: 120,
+    },
     searchBarRow: {
       paddingHorizontal: 16,
       paddingBottom: 8,