feat(dashboard,types): add metadata form to Stock Location (#15025)

## Summary

**What** — What changes are introduced in this PR?

Add metadata form to Stock Location in Admin dashboard.

**Why** — Why are these changes relevant or necessary?  

No way to see nor update metadata from the Dashboard.

**How** — How have these changes been implemented?

Added metadata from in new route.

**Testing** — How have these changes been tested, or how can the reviewer test the feature?

*Please provide answer here*

---

## Examples

Provide examples or code snippets that demonstrate how this feature works, or how it can be used in practice.  
This helps with documentation and ensures maintainers can quickly understand and verify the change.

```ts
// Example usage
```

---

## Checklist

Please ensure the following before requesting a review:

- [x] I have added a **changeset** for this PR
    - Every non-breaking change should be marked as a **patch**
    - To add a changeset, run `yarn changeset` and follow the prompts
- [ ] The changes are covered by relevant **tests**
- [x] I have verified the code works as intended locally
- [x] I have linked the related issue(s) if applicable

---

## Additional Context

Add any additional context, related issues, or references that might help the reviewer understand this PR.

Author: NicolasGorga

.changeset/yummy-pets-invite.md

@@ -0,0 +1,6 @@
+---
+"@medusajs/dashboard": patch
+"@medusajs/types": patch
+---
+
+feat(dashboard,types): add metadata form to Stock Location

packages/admin/dashboard/src/dashboard-app/routes/get-route.map.tsx

@@ -1298,6 +1298,11 @@ export function getRouteMap({
                           "../../routes/locations/location-fulfillment-providers"
                         ),
                     },
+                    {
+                      path: "metadata/edit",
+                      lazy: () =>
+                        import("../../routes/locations/location-metadata"),
+                    },
                     {
                       path: "fulfillment-set/:fset_id",
                       children: [
@@ -1869,7 +1874,7 @@ export function getRouteMap({
                 },
               ],
             },
-            ...(settingsRoutes.flatMap(r => r?.children || [])),
+            ...settingsRoutes.flatMap((r) => r?.children || []),
           ],
         },
       ],

packages/admin/dashboard/src/routes/locations/location-detail/constants.ts

@@ -1,2 +1,2 @@
 export const LOCATION_DETAILS_FIELD =
-  "name,*sales_channels,*address,fulfillment_sets.type,fulfillment_sets.name,*fulfillment_sets.service_zones.geo_zones,*fulfillment_sets.service_zones,*fulfillment_sets.service_zones.shipping_options,*fulfillment_sets.service_zones.shipping_options.rules,*fulfillment_sets.service_zones.shipping_options.shipping_profile,*fulfillment_providers"
+  "name,metadata,*sales_channels,*address,fulfillment_sets.type,fulfillment_sets.name,*fulfillment_sets.service_zones.geo_zones,*fulfillment_sets.service_zones,*fulfillment_sets.service_zones.shipping_options,*fulfillment_sets.service_zones.shipping_options.rules,*fulfillment_sets.service_zones.shipping_options.shipping_profile,*fulfillment_providers"

packages/admin/dashboard/src/routes/locations/location-detail/location-detail.tsx

@@ -49,6 +49,7 @@ export const LocationDetail = () => {
         sideBefore: getWidgets("location.details.side.before"),
       }}
       data={location}
+      showMetadata
       showJSON
       hasOutlet
     >

packages/admin/dashboard/src/routes/locations/location-metadata/index.ts

@@ -0,0 +1 @@
+export { LocationMetadata as Component } from "./location-metadata"

packages/admin/dashboard/src/routes/locations/location-metadata/location-metadata.tsx

@@ -0,0 +1,29 @@
+import { useParams } from "react-router-dom"
+import { MetadataForm } from "../../../components/forms/metadata-form"
+import { useStockLocation, useUpdateStockLocation } from "../../../hooks/api"
+
+export const LocationMetadata = () => {
+  const { location_id } = useParams()
+
+  const { stock_location, isPending, isError, error } = useStockLocation(
+    location_id!,
+    { fields: "id,metadata" }
+  )
+
+  const { mutateAsync, isPending: isMutating } = useUpdateStockLocation(
+    location_id!
+  )
+
+  if (isError) {
+    throw error
+  }
+
+  return (
+    <MetadataForm
+      metadata={stock_location?.metadata}
+      hook={mutateAsync}
+      isPending={isPending}
+      isMutating={isMutating}
+    />
+  )
+}

packages/core/types/src/http/stock-locations/admin/entities.ts

@@ -24,6 +24,10 @@ export interface AdminStockLocation {
    * The name of the stock location.
    */
   name: string
+  /**
+   * The metadata associated with the stock location.
+   */
+  metadata: Record<string, unknown> | null
   /**
    * The ID of the address associated with the stock location.
    */

packages/core/types/src/http/stock-locations/admin/payloads.ts

@@ -82,7 +82,7 @@ export interface AdminUpdateStockLocation {
   /**
    * Custom key-value pairs that can be added to the stock location.
    */
-  metadata?: Record<string, unknown>
+  metadata?: Record<string, unknown> | null
 }
 
 export interface AdminUpdateStockLocationSalesChannels {