chore: fix container query bug in ai chat widget (#40607)

/ok-to-test tags="@tag.Anvil"

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> [!TIP]
> 🟢 🟢 🟢 All cypress tests have passed! 🎉 🎉 🎉
> Workflow run:
<https://github.com/appsmithorg/appsmith/actions/runs/14900550928>
> Commit: a3a3579aaac44d2cfdfa956d46024145c4bfdad9
> <a
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target="_blank">Cypress dashboard</a>.
> Tags: `@tag.Anvil`
> Spec:
> <hr>Thu, 08 May 2025 07:22:28 UTC
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<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Style**
- Introduced a named container ("flex-container") to relevant CSS
classes for improved container query support.
- Updated container queries to explicitly reference the new container
name, enabling more precise and scoped responsive styling.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

app/client/packages/design-system/widgets/src/components/Flex/src/flexCss.ts

@@ -97,7 +97,7 @@ export const containerDimensionStyles = <T = FlexCssProps[keyof FlexCssProps]>(
       if (current !== "base") {
         return (
           prev +
-          `@container (min-width: ${current}) {& {
+          `@container flex-container (min-width: ${current}) {& {
           ${cssProp}: ${
             //@ts-expect-error: type mismatch
             callback ? callback(value[current], extraProps) : value[current]

app/client/packages/design-system/widgets/src/components/Flex/src/styles.module.css

@@ -1,5 +1,6 @@
 .flexContainer {
   container-type: inline-size;
+  container-name: flex-container;
   display: flex;
   justify-content: center;
   width: 100%;

app/client/src/layoutSystems/anvil/layoutComponents/components/styles.css

@@ -1,3 +1,4 @@
 .make-container {
   container-type: inline-size;
+  container-name: flex-container;
 }