added imessage app, async is hardv2

StickerSlackiMessageExtension/Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

StickerSlackiMessageExtension/Assets.xcassets/iMessage App Icon.stickersiconset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "60x45"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "60x45"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "67x50"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "74x55"
+    },
+    {
+      "idiom" : "ios-marketing",
+      "scale" : "1x",
+      "size" : "1024x1024"
+    },
+    {
+      "idiom" : "universal",
+      "platform" : "ios",
+      "scale" : "2x",
+      "size" : "27x20"
+    },
+    {
+      "idiom" : "universal",
+      "platform" : "ios",
+      "scale" : "3x",
+      "size" : "27x20"
+    },
+    {
+      "idiom" : "universal",
+      "platform" : "ios",
+      "scale" : "2x",
+      "size" : "32x24"
+    },
+    {
+      "idiom" : "universal",
+      "platform" : "ios",
+      "scale" : "3x",
+      "size" : "32x24"
+    },
+    {
+      "idiom" : "ios-marketing",
+      "platform" : "ios",
+      "scale" : "1x",
+      "size" : "1024x768"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

StickerSlackiMessageExtension/Base.lproj/MainInterface.storyboard

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+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="ObA-dk-sSI">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--Messages View Controller-->
+        <scene sceneID="7MM-of-jgj">
+            <objects>
+                <viewController id="ObA-dk-sSI" customClass="MessagesViewController" customModuleProvider="target" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="zMn-AG-sqS">
+                        <rect key="frame" x="0.0" y="0.0" width="320" height="528"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Hello World" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="d1e-fi-ked">
+                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                                <color key="textColor" xcode11CocoaTouchSystemColor="labelColor" cocoaTouchSystemColor="darkTextColor"/>
+                                <nil key="highlightedColor"/>
+                            </label>
+                        </subviews>
+                        <color key="backgroundColor" xcode11CocoaTouchSystemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
+                        <constraints>
+                            <constraint firstAttribute="centerY" secondItem="d1e-fi-ked" secondAttribute="centerY" id="H0s-hz-dDP"/>
+                            <constraint firstAttribute="centerX" secondItem="d1e-fi-ked" secondAttribute="centerX" id="wFy-hW-Bib"/>
+                        </constraints>
+                        <viewLayoutGuide key="safeArea" id="LDy-ih-0nr"/>
+                    </view>
+                    <freeformSimulatedSizeMetrics key="simulatedDestinationMetrics"/>
+                    <size key="freeformSize" width="320" height="528"/>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="X47-rx-isc" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>

StickerSlackiMessageExtension/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>NSExtension</key>
+	<dict>
+		<key>NSExtensionMainStoryboard</key>
+		<string>MainInterface</string>
+		<key>NSExtensionPointIdentifier</key>
+		<string>com.apple.message-payload-provider</string>
+	</dict>
+</dict>
+</plist>

StickerSlackiMessageExtension/MessagesViewController.swift

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+//
+//  MessagesViewController.swift
+//  StickerSlackiMessageExtension
+//
+//  Created by neon443 on 18/10/2025.
+//
+
+import UIKit
+import Messages
+
+class MessagesViewController: MSMessagesAppViewController {
+    
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        // Do any additional setup after loading the view.
+    }
+    
+    // MARK: - Conversation Handling
+    
+    override func willBecomeActive(with conversation: MSConversation) {
+        // Called when the extension is about to move from the inactive to active state.
+        // This will happen when the extension is about to present UI.
+        
+        // Use this method to configure the extension and restore previously stored state.
+    }
+    
+    override func didResignActive(with conversation: MSConversation) {
+        // Called when the extension is about to move from the active to inactive state.
+        // This will happen when the user dismisses the extension, changes to a different
+        // conversation or quits Messages.
+        
+        // Use this method to release shared resources, save user data, invalidate timers,
+        // and store enough state information to restore your extension to its current state
+        // in case it is terminated later.
+    }
+   
+    override func didReceive(_ message: MSMessage, conversation: MSConversation) {
+        // Called when a message arrives that was generated by another instance of this
+        // extension on a remote device.
+        
+        // Use this method to trigger UI updates in response to the message.
+    }
+    
+    override func didStartSending(_ message: MSMessage, conversation: MSConversation) {
+        // Called when the user taps the send button.
+    }
+    
+    override func didCancelSending(_ message: MSMessage, conversation: MSConversation) {
+        // Called when the user deletes the message without sending it.
+    
+        // Use this to clean up state related to the deleted message.
+    }
+    
+    override func willTransition(to presentationStyle: MSMessagesAppPresentationStyle) {
+        // Called before the extension transitions to a new presentation style.
+    
+        // Use this method to prepare for the change in presentation style.
+    }
+    
+    override func didTransition(to presentationStyle: MSMessagesAppPresentationStyle) {
+        // Called after the extension transitions to a new presentation style.
+    
+        // Use this method to finalize any behaviors associated with the change in presentation style.
+    }
+
+}