chore(ios): remove temporary cold-start share diagnostics

Remove the temporary diagnostics added during the iOS share-target
investigation, tagged with the TEMPORARY SHARE TARGET DIAGNOSTICS marker.

- Drop the pendingShareExists field/computation from ShareExtensionDiagnostics
  across the Swift utility, TS definitions, and web stub
- Remove the cold-start diagnostics block in main.capacitor.ts (the iOS
  getShareExtensionDiagnostics call and [ShareTarget] Cold-start state dump)
- Drop pendingShareExists from the getShareExtensionDiagnostics log line

Kept getShareExtensionDiagnostics itself (unmarked plugin API + registration),
the unmarked [ShareTarget] print logging, share-target functionality, and
Android code unchanged.

ios/App/App/SharedImageUtility.swift

@@ -108,9 +108,7 @@ public class SharedImageUtility {
                 "shareExtensionLastStart": NSNull(),
                 "sharedPhotoShareId": NSNull(),
                 "sharedPhotoFilePath": NSNull(),
-                "fileExists": false,
-                // TEMPORARY SHARE TARGET DIAGNOSTICS
-                "pendingShareExists": false
+                "fileExists": false
             ]
         }
 
@@ -125,23 +123,13 @@ public class SharedImageUtility {
             fileExists = false
         }
 
-        // TEMPORARY SHARE TARGET DIAGNOSTICS
-        let pendingShareExists = (
-            shareExtensionLastStart != nil ||
-            shareId != nil ||
-            filePath != nil ||
-            fileExists == true
-        )
-
-        print("[ShareTarget] getShareExtensionDiagnostics shareExtensionLastStart=\(shareExtensionLastStart ?? "nil") sharedPhotoShareId=\(shareId ?? "nil") sharedPhotoFilePath=\(filePath ?? "nil") fileExists=\(fileExists) pendingShareExists=\(pendingShareExists)")
+        print("[ShareTarget] getShareExtensionDiagnostics shareExtensionLastStart=\(shareExtensionLastStart ?? "nil") sharedPhotoShareId=\(shareId ?? "nil") sharedPhotoFilePath=\(filePath ?? "nil") fileExists=\(fileExists)")
 
         return [
             "shareExtensionLastStart": shareExtensionLastStart ?? NSNull(),
             "sharedPhotoShareId": shareId ?? NSNull(),
             "sharedPhotoFilePath": filePath ?? NSNull(),
-            "fileExists": fileExists,
-            // TEMPORARY SHARE TARGET DIAGNOSTICS
-            "pendingShareExists": pendingShareExists
+            "fileExists": fileExists
         ]
     }