fix(dashboard): Limit file uploads to 1MB (#13981)

## Summary

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

Limit file uploads to 1MB

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

Prevent large file uploads in the Admin 

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

Set size limits on the file uploads

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

---

## Checklist

Please ensure the following before requesting a review:

- [ ] 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**
- [ ] I have verified the code works as intended locally
- [ ] I have linked the related issue(s) if applicable

---

## Additional Context

CLOSES CORE-1270


---

> [!NOTE]
> Adds a 1MB default file size limit to `FileUpload`, surfaces size/type rejections in media forms via new i18n, and allows unlimited size for product import.
> 
> - **Components**:
>   - `components/common/file-upload/file-upload.tsx`:
>     - Add `maxFileSize` (default 1MB) and size validation; return `rejectedFiles` alongside valid files.
> - **Products › Media Upload**:
>   - `upload-media-form-item.tsx`:
>     - Handle `rejectedFiles` and set form errors for invalid type and oversized files.
> - **Products › Import**:
>   - `upload-import.tsx`: Use `maxFileSize={Infinity}` to disable size limit for CSV import.
> - **i18n**:
>   - Schema and EN translations: add `products.media.fileTooLarge` message.
> 
> <sup>Written by [Cursor Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit c8c67f4d329f8767e99694649bf0b3fe4cf400e9. This will update automatically on new commits. Configure [here](https://cursor.com/dashboard?tab=bugbot).</sup>

packages/admin/dashboard/src/routes/products/common/components/upload-media-form-item/upload-media-form-item.tsx

@@ -5,6 +5,7 @@ import { z } from "zod"
 import {
   FileType,
   FileUpload,
+  RejectedFile,
 } from "../../../../../components/common/file-upload"
 import { Form } from "../../../../../components/common/form"
 import { MediaSchema } from "../../../product-create/constants"
@@ -47,11 +48,13 @@ export const UploadMediaFormItem = ({
   const { t } = useTranslation()
 
   const hasInvalidFiles = useCallback(
-    (fileList: FileType[]) => {
+    (fileList: FileType[] = [], rejectedFiles: RejectedFile[] = []) => {
       const invalidFile = fileList.find(
-        (f) => !SUPPORTED_FORMATS.includes(f.file.type)
+        (f) => !SUPPORTED_FORMATS.includes(f?.file?.type)
       )
 
+      let hasInvalidFile = false;
+
       if (invalidFile) {
         form.setError("media", {
           type: "invalid_file",
@@ -61,22 +64,37 @@ export const UploadMediaFormItem = ({
           }),
         })
 
-        return true
+        hasInvalidFile = true;
       }
 
-      return false
+      const fileSizeRejections = rejectedFiles.filter((f) => f?.reason === "size")
+
+      if (fileSizeRejections.length) {
+        const fileNames = fileSizeRejections.map((f) => f.file.name).join(", ")
+        form.setError("media", {
+          type: "file_too_large",
+          message: t("products.media.fileTooLarge", {
+            name: fileNames,
+            size: "1MB",
+          }),
+        })
+
+        hasInvalidFile = true;
+      }
+
+      return hasInvalidFile;
     },
     [form, t]
   )
 
   const onUploaded = useCallback(
-    (files: FileType[]) => {
+    (files: FileType[] = [], rejectedFiles: RejectedFile[] = []) => {
       form.clearErrors("media")
-      if (hasInvalidFiles(files)) {
+      if (hasInvalidFiles(files, rejectedFiles)) {
         return
       }
 
-      files.forEach((f) => append({ ...f, isThumbnail: false }))
+      files?.forEach((f) => append({ ...f, isThumbnail: false }))
     },
     [form, append, hasInvalidFiles]
   )

packages/admin/dashboard/src/routes/products/product-import/components/upload-import.tsx

@@ -48,6 +48,7 @@ export const UploadImport = ({
           }
           onUploaded(files[0].file)
         }}
+        maxFileSize={Infinity}
       />
 
       {error && (