fix(studio): disable network restrictions for v3 (AWS_K8S) projects (#50996)

## Summary
- Network restrictions aren't supported on v3 (AWS_K8S) projects, but
the Network Restrictions settings section previously only disabled
itself for High Availability projects, leaving a fully working (but
non-functional) UI for non-HA v3 projects.
- Adds `useIsAwsK8sCloudProvider()` to the section's disabled check,
alongside a v3-specific disabled notice mirroring the existing High
Availability disabled notice pattern.

Resolves
[FE-4482](https://linear.app/supabase/issue/FE-4482/disable-network-restrictions-for-v3-aws-k8s-projects).

## Test plan
- [x] `tsc --noEmit` passes for the changed file
- [x] `eslint` passes for the changed file
- [x] `prettier --check` passes for the changed file
- [x] Mirrors the existing, already-shipped High Availability
disabled-section pattern in the same component

🤖 Generated with [Claude Code](https://claude.com/claude-code)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Behavior Changes**
* Network restrictions are unavailable for AWS Kubernetes and High
Availability projects, and for users without update permission. AWS
Kubernetes projects display a dedicated explanation; restriction details
and management controls are hidden.

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

apps/studio/components/interfaces/Settings/Database/NetworkRestrictions/NetworkRestrictions.tsx

@@ -14,6 +14,7 @@ import {
   DropdownMenuItem,
   DropdownMenuTrigger,
 } from 'ui'
+import { Admonition } from 'ui-patterns/Admonition'
 import {
   PageSection,
   PageSectionAside,
@@ -34,12 +35,13 @@ import { HighAvailabilityDisabledSectionNotice } from '@/components/ui/HighAvail
 import { useNetworkRestrictionsQuery } from '@/data/network-restrictions/network-restrictions-query'
 import { useAsyncCheckPermissions } from '@/hooks/misc/useCheckPermissions'
 import { useHighAvailability } from '@/hooks/misc/useHighAvailability'
-import { useSelectedProjectQuery } from '@/hooks/misc/useSelectedProject'
+import { useIsAwsK8sCloudProvider, useSelectedProjectQuery } from '@/hooks/misc/useSelectedProject'
 import { DOCS_URL } from '@/lib/constants'
 
 const HA_DISABLED_TITLE = 'Network restrictions unavailable on High Availability projects'
 const HA_DISABLED_DESCRIPTION =
   "We're working to bring network restrictions to High Availability projects. Contact support if this is blocking your work."
+const AWS_K8S_DISABLED_TITLE = 'Network restrictions are not yet supported on this project'
 
 interface AccessButtonProps {
   disabled: boolean
@@ -84,6 +86,7 @@ export const NetworkRestrictions = () => {
   const { ref } = useParams()
   const { data: project } = useSelectedProjectQuery()
   const { isHighAvailability } = useHighAvailability()
+  const isAwsK8s = useIsAwsK8sCloudProvider()
   const [isAddingAddress, setIsAddingAddress] = useState<undefined | 'IPv4' | 'IPv6'>()
   const [isAllowingAll, setIsAllowingAll] = useState(false)
   const [isDisallowingAll, setIsDisallowingAll] = useState(false)
@@ -103,10 +106,12 @@ export const NetworkRestrictions = () => {
     }
   )
 
-  const isSectionDisabled = isHighAvailability || !canUpdateNetworkRestrictions
+  const isSectionDisabled = isHighAvailability || isAwsK8s || !canUpdateNetworkRestrictions
   const sectionDisabledReason = isHighAvailability
     ? HA_DISABLED_TITLE
-    : 'You need additional permissions to update network restrictions'
+    : isAwsK8s
+      ? AWS_K8S_DISABLED_TITLE
+      : 'You need additional permissions to update network restrictions'
 
   const hasAccessToRestrictions = data?.entitlement === 'allowed'
   const ipv4Restrictions = data?.config?.dbAllowedCidrs ?? []
@@ -131,7 +136,7 @@ export const NetworkRestrictions = () => {
           </PageSectionSummary>
           <PageSectionAside className="flex items-center gap-x-2">
             <DocsButton href={`${DOCS_URL}/guides/platform/network-restrictions`} />
-            {!canUpdateNetworkRestrictions || isHighAvailability ? (
+            {isSectionDisabled ? (
               <ButtonTooltip
                 disabled
                 variant="primary"
@@ -184,7 +189,13 @@ export const NetworkRestrictions = () => {
               />
             </div>
           )}
+          {!isHighAvailability && isAwsK8s && (
+            <div className="mb-4">
+              <Admonition type="default" title={AWS_K8S_DISABLED_TITLE} />
+            </div>
+          )}
           {!isHighAvailability &&
+            !isAwsK8s &&
             (isLoading ? (
               <Card>
                 <CardContent>