Now that AppBridgeViewController registers SharedImagePlugin from
capacitorDidLoad(), remove the obsolete plugin-registration logic from
AppDelegate: the 5-attempt retry loop in didFinishLaunchingWithOptions,
the registerSharedImagePlugin() method, and the registration-specific
logging. SharedImagePlugin is now registered from a single, deterministic
site.
All non-registration responsibilities are unchanged: notification
handling, URL and universal-link proxying, SharedPhotoReady activation
logic, every lifecycle callback, the temporary app launch tracing, and
all temporary share-target diagnostics remain intact. No JS or Android
changes.
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