feat(media): implement integrated media manager with sidebar and picker

- Implement DriveService and ShopifyMediaService for backend operations
- Create MediaSidebar.html with premium UI and auto-polling
- Integrate Google Picker API for robust file selection
- Orchestrate sync logic via MediaService (Drive -> Staged Upload -> Shopify)
- Add secure config handling for API keys and tokens
- Update ppsscript.json with required OAuth scopes
- Update MEMORY.md and README.md with architecture details

src/global.ts

@@ -23,6 +23,8 @@ import { fillProductFromTemplate } from "./fillProductFromTemplate"
 import { showSidebar, getQueueStatus, setQueueEnabled, deleteEdit, pushEdit } from "./sidebar"
 import { checkRecentSales, reconcileSalesHandler } from "./salesSync"
 import { installSalesSyncTrigger } from "./triggers"
+import { showMediaSidebar, getSelectedSku, getMediaForSku, saveFileToDrive, syncMediaForSku, getPickerConfig, importFromPicker } from "./mediaHandlers"
+import { runSystemDiagnostics } from "./verificationSuite"
 
 // prettier-ignore
 ;(global as any).onOpen = onOpen
@@ -49,3 +51,11 @@ import { installSalesSyncTrigger } from "./triggers"
 ;(global as any).checkRecentSales = checkRecentSales
 ;(global as any).reconcileSalesHandler = reconcileSalesHandler
 ;(global as any).installSalesSyncTrigger = installSalesSyncTrigger
+;(global as any).showMediaSidebar = showMediaSidebar
+;(global as any).getSelectedSku = getSelectedSku
+;(global as any).getMediaForSku = getMediaForSku
+;(global as any).saveFileToDrive = saveFileToDrive
+;(global as any).syncMediaForSku = syncMediaForSku
+;(global as any).getPickerConfig = getPickerConfig
+;(global as any).importFromPicker = importFromPicker
+;(global as any).runSystemDiagnostics = runSystemDiagnostics