Refactor Media Manager sync logic and fix duplication bugs

This major refactor addresses improper image matching and duplication:

- Implemented strict ID-based matching in 'MediaService', removing the greedy filename matching fallback.

- Redesigned synchronization pipeline to treat Google Drive as the Source of Truth, supporting orphan adoption (Shopify -> Drive) and secure uploads.

- Implemented 'gallery_order' using Drive file properties (supporting both v2 and v3 APIs) for stable, drag-and-drop global ordering.

- Added conditional file renaming using timestamps to enforce '_' naming convention without unnecessary renames.

- Fixed runtime errors in 'MediaService' loops and updated 'ShopifyMediaService' GraphQL mutations to match correctly schema.

- Rewrote 'MediaService.test.ts' with robust test cases for strict matching, adoption, sorting, and reordering.

src/services/MockDriveService.ts

@@ -12,11 +12,29 @@ export class MockDriveService implements IDriveService {
     // Mock implementation finding by name "under" parent
     const key = `${parentFolderId}/${folderName}`
     if (!this.folders.has(key)) {
+        const id = `mock_folder_${folderName}_id`
         const newFolder = {
-            getId: () => `mock_folder_${folderName}_id`,
+            getId: () => id,
             getName: () => folderName,
             getUrl: () => `https://mock.drive/folders/${folderName}`,
-            createFile: (blob) => this.saveFile(blob, `mock_folder_${folderName}_id`)
+            createFile: (blob) => this.saveFile(blob, id),
+            addFile: (file) => {
+                console.log(`[MockDrive] addFile: Adding ${file.getId()} to ${id}`)
+                // Remove from all other folders (simplification) or just 'root'
+                for (const [fId, files] of this.files.entries()) {
+                    const idx = files.findIndex(f => f.getId() === file.getId())
+                    if (idx !== -1) {
+                        console.log(`[MockDrive] Removed ${file.getId()} from ${fId}`)
+                        files.splice(idx, 1)
+                    }
+                }
+                // Add to this folder
+                if (!this.files.has(id)) {
+                    this.files.set(id, [])
+                }
+                this.files.get(id).push(file)
+                return newFolder
+            }
         } as unknown as GoogleAppsScript.Drive.Folder;
         this.folders.set(key, newFolder)
     }
@@ -24,20 +42,26 @@ export class MockDriveService implements IDriveService {
   }
 
   saveFile(blob: GoogleAppsScript.Base.Blob, folderId: string): GoogleAppsScript.Drive.File {
+     const id = `mock_file_${Date.now()}_${Math.floor(Math.random() * 1000)}`
      const newFile = {
-        getId: () => `mock_file_${Date.now()}`,
+        getId: () => id,
         getName: () => blob.getName(),
         getBlob: () => blob,
         getUrl: () => `https://mock.drive/files/${blob.getName()}`,
         getLastUpdated: () => new Date(),
-        getThumbnail: () => ({ getBytes: () => [] })
+        getThumbnail: () => ({ getBytes: () => [] }),
+        getAppProperty: (key) => {
+             return (newFile as any)._properties?.[key]
+        }
      } as unknown as GoogleAppsScript.Drive.File
 
+     // Initialize properties container
+     ;(newFile as any)._properties = {}
+
      if (!this.files.has(folderId)) {
         this.files.set(folderId, [])
      }
      this.files.get(folderId).push(newFile)
-     console.log(`[MockDrive] Saved file ${newFile.getName()} to ${folderId}. Total files: ${this.files.get(folderId).length}`)
      return newFile
   }
 
@@ -69,10 +93,25 @@ export class MockDriveService implements IDriveService {
 
   updateFileProperties(fileId: string, properties: any): void {
       console.log(`[MockDrive] Updating properties for ${fileId}`, properties)
+      const file = this.getFileById(fileId)
+      const mockFile = file as any
+      if (!mockFile._properties) {
+          mockFile._properties = {}
+      }
+      Object.assign(mockFile._properties, properties)
   }
 
   createFile(blob: GoogleAppsScript.Base.Blob): GoogleAppsScript.Drive.File {
       // Create in "root" or similar
       return this.saveFile(blob, "root")
   }
+
+  getFileProperties(fileId: string): {[key: string]: string} {
+      try {
+          const file = this.getFileById(fileId)
+          return (file as any)._properties || {}
+      } catch (e) {
+          return {}
+      }
+  }
 }