fix: Fix assets layout (#5543)

## Description

1. What is this PR about (link the issue and add a short description)

## Steps for reproduction

1. click button
2. expect xyz

## Code Review

- [ ] hi @kof, I need you to do
  - conceptual review (architecture, feature-correctness)
  - detailed review (read every line)
  - test it on preview

## Before requesting a review

- [ ] made a self-review
- [ ] added inline comments where things may be not obvious (the "why",
not "what")

## Before merging

- [ ] tested locally and on preview environment (preview dev login:
0000)
- [ ] updated [test
cases](https://github.com/webstudio-is/webstudio/blob/main/apps/builder/docs/test-cases.md)
document
- [ ] added tests
- [ ] if any new env variables are added, added them to `.env` file

Author: kof

apps/builder/app/builder/shared/assets/assets-shell.tsx

@@ -181,7 +181,12 @@ export const AssetsShell = ({
         position: "relative",
       }}
     >
-      <Flex css={{ padding: theme.panel.padding }} gap="2" wrap="wrap">
+      <Flex
+        css={{ padding: theme.panel.padding }}
+        gap="2"
+        wrap="wrap"
+        shrink={false}
+      >
         <SearchField
           css={{ flexGrow: 1 }}
           {...searchProps}