fix(swift): use typed params for size-changed and always attempt teardown

1. Size-changed notification now properly decodes to McpUiSizeChangedParams
   using JSONDecoder, with fallback to manual NSNumber extraction.

2. Teardown now always attempts to send the teardown request even if the
   app hasn't fully initialized (matching web host behavior). Previously
   it would skip teardown if isReady() returned false, causing the card
   to disappear immediately without giving the app a chance to clean up.

Author: ochafik

examples/basic-host-swift/Sources/BasicHostApp/McpHostViewModel.swift

@@ -575,20 +575,15 @@ class ToolCallInfo: ObservableObject, Identifiable {
         var errorMessage: String?
 
         if let bridge = appBridge {
-            // Only send teardown if the bridge is initialized
-            // If not initialized, the app hasn't done anything worth saving
-            let isReady = await bridge.isReady()
-            if isReady {
-                logger.info("Sending teardown request...")
-                do {
-                    _ = try await bridge.sendResourceTeardown()
-                    logger.info("Teardown request completed successfully")
-                } catch {
-                    logger.error("Teardown request failed: \(String(describing: error))")
-                    errorMessage = "Teardown failed: app may not have saved data"
-                }
-            } else {
-                logger.info("Skipping teardown - bridge not yet initialized")
+            // Always attempt teardown - the app should handle it gracefully
+            // even if not fully initialized (matching web host behavior)
+            logger.info("Sending teardown request...")
+            do {
+                _ = try await bridge.sendResourceTeardown()
+                logger.info("Teardown request completed successfully")
+            } catch {
+                // Teardown failed - app may have already closed or wasn't initialized
+                logger.warning("Teardown request failed (app may have already closed): \(String(describing: error))")
             }
 
             logger.info("Closing bridge...")

swift/Sources/McpApps/AppBridge.swift

@@ -107,10 +107,22 @@ public actor AppBridge {
             isInitialized = true
             onInitialized?()
         case "ui/notifications/size-changed":
-            // Handle both Int and Double from JSON (integers decode as Int, not Double)
-            let width = (notification.params?["width"]?.value as? NSNumber)?.intValue
-            let height = (notification.params?["height"]?.value as? NSNumber)?.intValue
-            onSizeChange?(width, height)
+            // Decode to typed params - handles both Int and Double from JSON
+            if let paramsDict = notification.params {
+                do {
+                    let data = try JSONSerialization.data(withJSONObject: paramsDict.mapValues { $0.value })
+                    let params = try JSONDecoder().decode(McpUiSizeChangedNotificationParams.self, from: data)
+                    // Convert Double? to Int? for callback
+                    let width = params.width.map { Int($0) }
+                    let height = params.height.map { Int($0) }
+                    onSizeChange?(width, height)
+                } catch {
+                    // Fallback: manually extract values (handles Int/Double mismatch)
+                    let width = (paramsDict["width"]?.value as? NSNumber)?.intValue
+                    let height = (paramsDict["height"]?.value as? NSNumber)?.intValue
+                    onSizeChange?(width, height)
+                }
+            }
         case "notifications/message":
             if let level = notification.params?["level"]?.value as? String,
                let logLevel = LogLevel(rawValue: level),