Wrobertson/zidnexxx (#15233)

## Description 

Describe the changes or additions included in this PR.

## Test Plan 

How did you test the new or updated feature?

---
If your changes are not user-facing and not a breaking change, you can
skip the following section. Otherwise, please indicate what changed, and
then add to the Release Notes section as highlighted during the release
process.

### Type of Change (Check all that apply)

- [ ] protocol change
- [ ] user-visible impact
- [ ] breaking change for a client SDKs
- [ ] breaking change for FNs (FN binary must upgrade)
- [ ] breaking change for validators or node operators (must upgrade
binaries)
- [ ] breaking change for on-chain data layout
- [ ] necessitate either a data wipe or data migration

### Release notes

.changeset/odd-lamps-behave.md

@@ -0,0 +1,5 @@
+---
+'@mysten/dapp-kit': patch
+---
+
+Set a high z-index for the account dropdown so that it doesn't get hidden

sdk/dapp-kit/src/components/AccountDropdownMenu.css.ts

@@ -9,6 +9,10 @@ export const connectedAccount = style({
 	gap: 8,
 });
 
+export const menuContainer = style({
+	zIndex: 999999999,
+});
+
 export const menuContent = style({
 	display: 'flex',
 	flexDirection: 'column',

sdk/dapp-kit/src/components/AccountDropdownMenu.tsx

@@ -42,7 +42,7 @@ export function AccountDropdownMenu({ currentAccount }: AccountDropdownMenuProps
 				</DropdownMenu.Trigger>
 			</StyleMarker>
 			<DropdownMenu.Portal>
-				<StyleMarker>
+				<StyleMarker className={styles.menuContainer}>
 					<DropdownMenu.Content className={styles.menuContent}>
 						{accounts.map((account) => (
 							<AccountDropdownMenuItem