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/initMenu.ts

@@ -6,6 +6,8 @@ import { reinstallTriggers, installSalesSyncTrigger } from "./triggers"
 import { reconcileSalesHandler } from "./salesSync"
 import { toastAndLog } from "./sheetUtils"
 import { showSidebar } from "./sidebar"
+import { showMediaSidebar } from "./mediaHandlers"
+import { runSystemDiagnostics } from "./verificationSuite"
 
 export function initMenu() {
   let ui = SpreadsheetApp.getUi()
@@ -16,6 +18,7 @@ export function initMenu() {
         .addItem("Fill out product from template", fillProductFromTemplate.name)
         .addItem("Match product to Shopify", matchProductToShopifyHandler.name)
         .addItem("Update Shopify Product", updateShopifyProductHandler.name)
+        .addItem("Media Manager", showMediaSidebar.name)
     )
     .addSeparator()
     .addSubMenu(
@@ -34,6 +37,7 @@ export function initMenu() {
         .addItem("Reinstall triggers", reinstallTriggers.name)
         .addItem("Update Sales Sync Trigger", installSalesSyncTrigger.name)
         .addItem("Troubleshoot", showSidebar.name)
+        .addItem("Run System Diagnostics", runSystemDiagnostics.name)
     )
     .addToUi()
 }