feat: add free shipping banner

[beeme1mr]

This is a demo for KubeCon

[gemini-code-assist]

Code Review

This pull request refactors a feature flag from offer-free-shipping to the more descriptive free-shipping-banner and updates its usage throughout the application. The changes also improve the generated OpenFeature hooks file by adding explicit return types and introducing a FlagKeys object to centralize flag keys. These are great improvements for maintainability. My review includes suggestions to further enhance the code by removing an unused import and consistently using the new FlagKeys constants within the hook implementations to eliminate magic strings.

[github-actions]

🚀 OpenFeature Manifest Comparison (validate-flags)

Warning

Remote Push Preview - The following changes will be applied to the remote flag service (https://flagd-studio.onrender.com/api) when your manifest is pushed

📊 Change Summary

Change Type	Count	Description
🟢 Additions	1	Flags that will be added to remote
🔴 Removals	0	Flags that will be removed from remote
🟡 Modifications	0	Flags that will be modified in remote
Total	1	Total differences

📋 View detailed changes

🟢 Flags That Will Be Added (1)

🟢 free-shipping-banner

🔄 View manifest diff

@@ -1,20 +1,15 @@
 {
   "$schema": "https://raw.githubusercontent.com/open-feature/cli/refs/heads/main/schema/v0/flag-manifest.json",
   "flags": {
-    "free-shipping-banner": {
-      "flagType": "boolean",
-      "description": "Controls the free shipping banner on the website. SHOP-4287",
-      "defaultValue": false
-    },
     "offer-free-shipping": {
-      "flagType": "boolean",
+      "defaultValue": false,
       "description": "Add free shipping to the UI.",
-      "defaultValue": false
+      "flagType": "boolean"
     },
     "sticky-header": {
-      "flagType": "boolean",
+      "defaultValue": false,
       "description": "Make the header stay at the top of the page while scrolling.",
-      "defaultValue": false
+      "flagType": "boolean"
     },
     "use-distributed-db": {
       "defaultValue": true,

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