Fix profile picture uploads from the app

Expo's fetch rejects React Native's { uri, name, type } FormData parts ("Unsupported FormDataPart
implementation"), so every upload failed. Upload an expo-file-system File instead, shrunk to 1024 px
first. The server also takes bigger photos (25 MB, sharp's default pixel limit) and logs why a
picture couldn't be read.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011Y2iUsKEWDuRGjK5FPmcUP

package-lock.json

@@ -820,10 +820,12 @@
         "expo-camera": "~57.0.6",
         "expo-constants": "~57.0.20",
         "expo-device": "~57.0.2",
+        "expo-file-system": "~57.0.7",
         "expo-font": "~57.0.4",
         "expo-glass-effect": "~57.0.4",
         "expo-haptics": "~57.0.3",
         "expo-image": "~57.0.5",
+        "expo-image-manipulator": "~57.0.21",
         "expo-image-picker": "~57.0.20",
         "expo-linear-gradient": "~57.0.2",
         "expo-linking": "~57.0.11",
@@ -11288,6 +11290,18 @@
         "expo": "*"
       }
     },
+    "node_modules/expo-image-manipulator": {
+      "version": "57.0.21",
+      "resolved": "https://registry.npmjs.org/expo-image-manipulator/-/expo-image-manipulator-57.0.21.tgz",
+      "integrity": "sha512-NZeNvZxBNf/PK97Df5zORmtqRR/LovkA+lHdRLm1IJFiVKjs4xr+Ib6/jWhDxn04VOX3TJswCQyu4SCxkgMe4Q==",
+      "license": "MIT",
+      "dependencies": {
+        "expo-image-loader": "~57.0.1"
+      },
+      "peerDependencies": {
+        "expo": "*"
+      }
+    },
     "node_modules/expo-image-picker": {
       "version": "57.0.20",
       "resolved": "https://registry.npmjs.org/expo-image-picker/-/expo-image-picker-57.0.20.tgz",