refactor(ios): remove orphaned Share Extension diagnostics API

Remove the getShareExtensionDiagnostics() API now that the share-target
investigation is complete and it has no remaining callers.

- Drop getShareExtensionDiagnostics from the plugin definition, web stub,
  Swift plugin method + registration, and SharedImageUtility implementation
- Remove the ShareExtensionDiagnostics TypeScript interface and its now-dead
  import in the web stub
- Remove the diagnostics-only [ShareTarget] log line and the now-unused
  shareExtensionLastStartKey constant in SharedImageUtility

getSharedImage/hasSharedImage, SharedPhotoReady logic, ShareViewController,
AppDelegate, and Android are unchanged. TypeScript type-check passes.

ios/App/App/SharedImagePlugin.swift

@@ -24,8 +24,7 @@ public class SharedImagePlugin: CAPPlugin, CAPBridgedPlugin {
     public var pluginMethods: [CAPPluginMethod] {
         return [
             CAPPluginMethod(#selector(getSharedImage(_:)), returnType: .promise),
-            CAPPluginMethod(#selector(hasSharedImage(_:)), returnType: .promise),
-            CAPPluginMethod(#selector(getShareExtensionDiagnostics(_:)), returnType: .promise)
+            CAPPluginMethod(#selector(hasSharedImage(_:)), returnType: .promise)
         ]
     }
     
@@ -63,12 +62,5 @@ public class SharedImagePlugin: CAPPlugin, CAPBridgedPlugin {
             "hasImage": hasImage
         ])
     }
-
-    /**
-     * Diagnostic snapshot of Share Extension startup and pending share state
-     */
-    @objc public func getShareExtensionDiagnostics(_ call: CAPPluginCall) {
-        call.resolve(SharedImageUtility.getShareExtensionDiagnostics())
-    }
 }
 

ios/App/App/SharedImageUtility.swift

@@ -14,7 +14,6 @@ public class SharedImageUtility {
     private static let sharedPhotoFileNameKey = "sharedPhotoFileName"
     private static let sharedPhotoFilePathKey = "sharedPhotoFilePath"
     private static let sharedPhotoShareIdKey = "sharedPhotoShareId"
-    private static let shareExtensionLastStartKey = "shareExtensionLastStart"
     private static let sharedPhotoReadyKey = "sharedPhotoReady"
     
     /// Get the App Group container URL for accessing shared files
@@ -98,41 +97,6 @@ public class SharedImageUtility {
         return FileManager.default.fileExists(atPath: fileURL.path)
     }
 
-    /**
-     * Diagnostic snapshot of Share Extension startup and pending share state
-     * Read-only: does not modify App Group storage
-     */
-    static func getShareExtensionDiagnostics() -> [String: Any] {
-        guard let userDefaults = UserDefaults(suiteName: appGroupIdentifier) else {
-            return [
-                "shareExtensionLastStart": NSNull(),
-                "sharedPhotoShareId": NSNull(),
-                "sharedPhotoFilePath": NSNull(),
-                "fileExists": false
-            ]
-        }
-
-        let shareExtensionLastStart = userDefaults.string(forKey: shareExtensionLastStartKey)
-        let shareId = userDefaults.string(forKey: sharedPhotoShareIdKey)
-        let filePath = userDefaults.string(forKey: sharedPhotoFilePathKey)
-        let fileExists: Bool
-        if let filePath = filePath, let containerURL = appGroupContainerURL {
-            let fileURL = containerURL.appendingPathComponent(filePath)
-            fileExists = FileManager.default.fileExists(atPath: fileURL.path)
-        } else {
-            fileExists = false
-        }
-
-        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
-        ]
-    }
-
     /**
      * Check if shared photo ready flag is set
      * This flag is set by the Share Extension when image is ready

src/plugins/SharedImagePlugin.web.ts

@@ -4,11 +4,7 @@
  */
 
 import { WebPlugin } from "@capacitor/core";
-import type {
-  SharedImagePlugin,
-  SharedImageResult,
-  ShareExtensionDiagnostics,
-} from "./definitions";
+import type { SharedImagePlugin, SharedImageResult } from "./definitions";
 
 export class SharedImagePluginWeb
   extends WebPlugin
@@ -22,13 +18,4 @@ export class SharedImagePluginWeb
   async hasSharedImage(): Promise<{ hasImage: boolean }> {
     return { hasImage: false };
   }
-
-  async getShareExtensionDiagnostics(): Promise<ShareExtensionDiagnostics> {
-    return {
-      shareExtensionLastStart: null,
-      sharedPhotoShareId: null,
-      sharedPhotoFilePath: null,
-      fileExists: false,
-    };
-  }
 }

src/plugins/definitions.ts

@@ -7,13 +7,6 @@ export interface SharedImageResult {
   fileName: string;
 }
 
-export interface ShareExtensionDiagnostics {
-  shareExtensionLastStart: string | null;
-  sharedPhotoShareId: string | null;
-  sharedPhotoFilePath: string | null;
-  fileExists: boolean;
-}
-
 export interface SharedImagePlugin {
   /**
    * Get shared image data from native layer
@@ -27,9 +20,4 @@ export interface SharedImagePlugin {
    * Useful for quick checks before calling getSharedImage()
    */
   hasSharedImage(): Promise<{ hasImage: boolean }>;
-
-  /**
-   * Diagnostic snapshot of Share Extension startup and pending share state (iOS)
-   */
-  getShareExtensionDiagnostics(): Promise<ShareExtensionDiagnostics>;
 }