[sample] apollo 5 with minimal cache fix

[kiftio]

What changes are you making?

Upgrades the Apollo GraphQL dependency from apollo-runtime v4.4.3 to v5.0.0 and migrates the normalized cache to the new standalone com.apollographql.cache:normalized-cache library (v1.0.3). As part of this migration:

• The Apollo cache is now configured using the new cache() builder extension with CacheKey.Scope.SERVICE and the normalized-cache-apollo-compiler-plugin is registered in the Apollo service configuration.
• Query methods in StorefrontApiClient are converted from suspend functions returning single values to functions returning Flow, using FetchPolicy.CacheAndNetwork to serve cached data immediately while fetching fresh data in the background.
• Repository and ViewModel layers are updated to expose and collect these flows, so the UI can reactively update when fresh network data arrives after an initial cache hit.
• Error handling in ViewModels is updated to avoid overwriting an already-loaded UI state with an error when a background network refresh fails.
• ProductViewModel preserves the currently selected variant and cart state when a product flow emits an updated value.

How to test

1. Launch the sample app and navigate to the home screen — collections should load immediately from cache on subsequent visits, then refresh with network data.
2. Open a collection and a product detail page and verify the same cache-then-network behaviour.
3. Disable network connectivity after an initial load, relaunch the app, and confirm that cached data is displayed without an error state.
4. Re-enable connectivity and confirm the UI updates with fresh data.
5. On a product detail page, select a variant, trigger a background refresh, and confirm the selected variant and quantity are preserved after the update.

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Before you merge

Important

• I've added tests to support my implementation
• I have read and agree with the Contribution Guidelines
• I have read and agree with the Code of Conduct
• I've updated the relevant platform README (platforms/swift/README.md and/or platforms/android/README.md)

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Releasing a new Swift version?

• I have bumped the version in ShopifyCheckoutKit.podspec
• I have bumped the version in platforms/swift/Sources/ShopifyCheckoutKit/ShopifyCheckoutKit.swift
• I have updated platforms/swift/CHANGELOG.md
• I have updated the SwiftPM/CocoaPods version snippets in platforms/swift/README.md (major version only)

Releasing a new Android version?

• I have bumped the versionName in platforms/android/lib/build.gradle
• I have updated platforms/android/CHANGELOG.md
• I have updated the Gradle/Maven version snippets in platforms/android/README.md

Tip

See the Contributing documentation for the full release process per platform.

[kiftio]

• [sample] apollo 5 with minimal cache fix #216 👈 (View in Graphite)
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