fix(share): attach captured card image when sharing to Instagram Stories

Both share modals opened the instagram-stories:// scheme without ever
placing the captured PNG on the pasteboard, so Instagram opened an empty
story. Replace the manual scheme launch with react-native-share
shareSingle(INSTAGRAM_STORIES), which writes the image to UIPasteboard
under com.instagram.sharedSticker.backgroundImage on iOS and uses the
ADD_TO_STORY intent on Android. Gate the flow on the required Facebook
App ID (EXPO_PUBLIC_FACEBOOK_APP_ID) and Instagram being installed, with
fallback to the system share sheet, and remove the dead base64 reads.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

apps/mobile/ios/Podfile.lock

@@ -417,7 +417,7 @@ PODS:
     - GoogleUtilities/Network (~> 8.1)
     - "GoogleUtilities/NSData+zlib (~> 8.1)"
     - nanopb (~> 3.30910.0)
-  - GoogleDataTransport (10.1.0):
+  - GoogleDataTransport (10.1.1):
     - nanopb (~> 3.30910.0)
     - PromisesObjC (~> 2.4)
   - GoogleSignIn (9.1.0):
@@ -3236,6 +3236,34 @@ PODS:
     - ReactCommon/turbomodule/core
     - SocketRocket
     - Yoga
+  - RNShare (12.3.1):
+    - boost
+    - DoubleConversion
+    - fast_float
+    - fmt
+    - glog
+    - hermes-engine
+    - RCT-Folly
+    - RCT-Folly/Fabric
+    - RCTRequired
+    - RCTTypeSafety
+    - React-Core
+    - React-debug
+    - React-Fabric
+    - React-featureflags
+    - React-graphics
+    - React-ImageManager
+    - React-jsi
+    - React-NativeModulesApple
+    - React-RCTFabric
+    - React-renderercss
+    - React-rendererdebug
+    - React-utils
+    - ReactCodegen
+    - ReactCommon/turbomodule/bridging
+    - ReactCommon/turbomodule/core
+    - SocketRocket
+    - Yoga
   - RNSVG (15.12.1):
     - boost
     - DoubleConversion
@@ -3517,6 +3545,7 @@ DEPENDENCIES:
   - RNPurchases (from `../../../node_modules/react-native-purchases`)
   - RNReanimated (from `../node_modules/react-native-reanimated`)
   - RNScreens (from `../../../node_modules/react-native-screens`)
+  - RNShare (from `../../../node_modules/react-native-share`)
   - RNSVG (from `../../../node_modules/react-native-svg`)
   - RNWorklets (from `../../../node_modules/react-native-worklets`)
   - SocketRocket (~> 0.7.1)
@@ -3792,6 +3821,8 @@ EXTERNAL SOURCES:
     :path: "../node_modules/react-native-reanimated"
   RNScreens:
     :path: "../../../node_modules/react-native-screens"
+  RNShare:
+    :path: "../../../node_modules/react-native-share"
   RNSVG:
     :path: "../../../node_modules/react-native-svg"
   RNWorklets:
@@ -3804,8 +3835,8 @@ EXTERNAL SOURCES:
 SPEC CHECKSUMS:
   AppAuth: 1c1a8afa7e12f2ec3a294d9882dfa5ab7d3cb063
   AppCheckCore: cc8fd0a3a230ddd401f326489c99990b013f0c4f
-  boost: 1dca942403ed9342f98334bf4c3621f011aa7946
-  DoubleConversion: f16ae600a246532c4020132d54af21d0ddb2a385
+  boost: 7e761d76ca2ce687f7cc98e698152abd03a18f90
+  DoubleConversion: cb417026b2400c8f53ae97020b2be961b59470cb
   EXApplication: 1e98d4b1dccdf30627f92917f4b2c5a53c330e5f
   EXAV: b60fcf142fae6684d295bc28cd7cfcb3335570ea
   EXConstants: 18ac927605517285307ea8f7ffe6fe7ca538eb5d
@@ -3851,10 +3882,10 @@ SPEC CHECKSUMS:
   FirebaseInstallations: 6a14ab3d694ebd9f839c48d330da5547e9ca9dc0
   FirebaseRemoteConfigInterop: 869ddca16614f979e5c931ece11fbb0b8729ed41
   FirebaseSessions: d614ca154c63dbbc6c10d6c38259c2162c4e7c9b
-  fmt: 01b82d4ca6470831d1cc0852a1af644be019e8f6
-  glog: 08b301085f15bcbb6ff8632a8ebaf239aae04e6a
+  fmt: a40bb5bd0294ea969aaaba240a927bd33d878cdd
+  glog: 5683914934d5b6e4240e497e0f4a3b42d1854183
   GoogleAppMeasurement: 72c9a682fec6290327ea5e3c4b829b247fcb2c17
-  GoogleDataTransport: aae35b7ea0c09004c3797d53c8c41f66f219d6a7
+  GoogleDataTransport: a24e58982ab3ba2f64d79613e027fe7f57e88539
   GoogleSignIn: fcee2257188d5eda57a5e2b6a715550ffff9206d
   GoogleUtilities: 00c88b9a86066ef77f0da2fab05f65d7768ed8e1
   GTMAppAuth: 217a876b249c3c585a54fd6f73e6b58c4f5c4238
@@ -3944,6 +3975,7 @@ SPEC CHECKSUMS:
   RNPurchases: ae1f8f522674a7938dd26eba6c103c40d049dfee
   RNReanimated: 45bfba06751010ae2f6a1cd8b9f618ac4ce1a12c
   RNScreens: 2e9c41cd099b1ca50136af8d57c3594214d0086a
+  RNShare: 61cad1e65b8e3788c97ee7c5cac4bcbb25a8df40
   RNSVG: 94a1be05fab4043354bcf7104f0f9b0e2231ef05
   RNWorklets: 09a47bd92d3da6e00420a060fcc86e23b745e980
   SDWebImage: e9fc87c1aab89a8ab1bbd74eba378c6f53be8abf

apps/mobile/ios/Sauci/Info.plist

@@ -52,6 +52,11 @@
 	<false/>
 	<key>ITSAppUsesNonExemptEncryption</key>
 	<false/>
+	<key>LSApplicationQueriesSchemes</key>
+	<array>
+		<string>instagram</string>
+		<string>instagram-stories</string>
+	</array>
 	<key>LSMinimumSystemVersion</key>
 	<string>12.0</string>
 	<key>LSRequiresIPhoneOS</key>