Log Sentry crash events through MXLog

Mirror crashes into our own logs via Sentry's beforeSend hook so the full crash
log ships with rageshakes. Adds a SentryEvent extension to extract the formatted
crash log from the event.

ElementX/Sources/Other/Extensions/SentryEvent.swift

@@ -0,0 +1,34 @@
+//
+// Copyright 2025 Element Creations Ltd.
+// Copyright 2025 New Vector Ltd.
+//
+// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
+// Please see LICENSE files in the repository root for full details.
+//
+
+import MatrixRustSDK
+import Sentry
+import UIKit
+
+extension Event {
+    /// A human readable crash log matching the format used by the legacy app.
+    /// `nil` for non-crash events (handled errors, transactions, etc.).
+    var crashLog: String? {
+        guard let exceptions,
+              exceptions.contains(where: { $0.mechanism?.handled?.boolValue == false }) else {
+            return nil
+        }
+        
+        let reason = exceptions.map { "\($0.type ?? "Unknown"): \($0.value ?? "")" }.joined(separator: "\n")
+        let infoPlist = InfoPlistReader.main
+        let device = UIDevice.current
+        
+        return """
+        \(reason)
+        Application: \(infoPlist.bundleExecutable) (\(infoPlist.bundleIdentifier))
+        Application version: \(infoPlist.bundleShortVersionString) (\(infoPlist.bundleVersion))
+        Matrix SDK version: \(sdkGitSha())
+        \(device.model) \(device.systemVersion)
+        """
+    }
+}