Feature: Robust Google Photos Integration & Media Hardening

- Implemented Google Photos Picker with Session API.
- Fixed 403 Forbidden errors by adding OAuth headers to download requests.
- Implemented MediaHandler resilience:
  - 3-Step Import (Save to Root -> Verify Folder -> Move).
  - Advanced Drive API Fallback (v3/v2) for file creation.
  - Blob Sanitization (Utilities.newBlob) to fix server errors.
- Enabled Advanced Drive Service in ppsscript.json.
- Updated Documentation (MEMORY.md, ARCHITECTURE.md) with findings.

src/appsscript.json

@@ -1,6 +1,13 @@
 {
   "timeZone": "America/Denver",
   "dependencies": {
+    "enabledAdvancedServices": [
+      {
+        "userSymbol": "Drive",
+        "serviceId": "drive",
+        "version": "v2"
+      }
+    ]
   },
   "exceptionLogging": "STACKDRIVER",
   "runtimeVersion": "V8",
@@ -10,6 +17,7 @@
     "https://www.googleapis.com/auth/script.container.ui",
     "https://www.googleapis.com/auth/script.scriptapp",
     "https://www.googleapis.com/auth/drive",
-    "https://www.googleapis.com/auth/userinfo.email"
+    "https://www.googleapis.com/auth/userinfo.email",
+    "https://www.googleapis.com/auth/photospicker.mediaitems.readonly"
   ]
 }