Add appimage build script

diff --git a/appimage/.gitignore b/appimage/.gitignore
new file mode 100644
index 0000000..27d63e0
--- /dev/null
+++ b/appimage/.gitignore
@@ -0,0 +1,5 @@
+# AppImage build artifacts
+appimagetool-*.AppImage
+AppDir/
+*.AppImage
+.last_build_id
\ No newline at end of file
diff --git a/appimage/AppImageBuilder.yml b/appimage/AppImageBuilder.yml
new file mode 100644
index 0000000..b388ff6
--- /dev/null
+++ b/appimage/AppImageBuilder.yml
@@ -0,0 +1,123 @@
+version: 1
+
+script:
+  # Build the Flutter app first
+  - flutter build linux --release
+  - rm -rf AppDir || true
+  - mkdir -p AppDir/usr/bin
+  - mkdir -p AppDir/usr/lib
+  - mkdir -p AppDir/usr/share/icons/hicolor/512x512/apps
+  - cp -r build/linux/x64/release/bundle/* AppDir/usr/bin/
+  - cp linux/launcher_icon.png AppDir/usr/share/icons/hicolor/512x512/apps/skylight_wallet.png
+
+AppDir:
+  path: ./AppDir
+  
+  app_info:
+    id: org.magicgrants.skylight
+    name: skylight_wallet
+    icon: skylight_wallet
+    version: latest
+    exec: usr/bin/skylight_wallet
+    exec_args: $@
+  
+  apt:
+    arch: amd64
+    sources:
+      - sourceline: 'deb [arch=amd64] http://archive.ubuntu.com/ubuntu/ jammy main restricted universe multiverse'
+        key_url: 'http://keyserver.ubuntu.com/pks/lookup?op=get&search=0x871920D1991BC93C'
+    
+    include:
+      # Core GTK3 and dependencies (based on actual ldd output)
+      - libgtk-3-0
+      - libglib2.0-0
+      - libgdk-pixbuf2.0-0
+      - libcairo2
+      - libcairo-gobject2
+      - libpango-1.0-0
+      - libpangocairo-1.0-0
+      - libpangoft2-1.0-0
+      - libharfbuzz0b
+      - libfribidi0
+      
+      # Accessibility
+      - libatk1.0-0
+      - libatk-bridge2.0-0
+      - libatspi2.0-0
+      
+      # Graphics and rendering
+      - libepoxy0
+      - libpixman-1-0
+      - libfreetype6
+      - libfontconfig1
+      
+      # X11 support
+      - libx11-6
+      - libxcomposite1
+      - libxdamage1
+      - libxext6
+      - libxfixes3
+      - libxi6
+      - libxrandr2
+      - libxrender1
+      - libxcursor1
+      - libxinerama1
+      - libxcb1
+      - libxcb-render0
+      - libxcb-shm0
+      
+      # Wayland support
+      - libwayland-client0
+      - libwayland-cursor0
+      - libwayland-egl1
+      - libxkbcommon0
+      
+      # System libraries
+      - libdbus-1-3
+      - libblkid1
+      - libmount1
+      - libsystemd0
+      
+      # Security and crypto
+      - libsecret-1-0
+      - libgcrypt20
+      
+      # Other dependencies from ldd
+      - libgraphite2-3
+      - libjson-glib-1.0-0
+      - libexpat1
+      - libpng16-16
+      - libthai0
+      - libdatrie1
+      - libpcre2-8-0
+      
+    exclude:
+      # Exclude very common system libraries that should be on all systems
+      - libc6
+      - libgcc-s1
+      - libstdc++6
+      - libm6
+  
+  files:
+    include: []
+    exclude:
+      - usr/share/man
+      - usr/share/doc/*/README.*
+      - usr/share/doc/*/changelog.*
+      - usr/share/doc/*/NEWS.*
+      - usr/share/doc/*/TODO.*
+  
+  test:
+    arch-latest:
+      image: appimagecrafters/tests-env:archlinux-latest
+      command: ./AppRun
+    ubuntu-xenial:
+      image: appimagecrafters/tests-env:ubuntu-xenial
+      command: ./AppRun
+    debian-stable:
+      image: appimagecrafters/tests-env:debian-stable
+      command: ./AppRun
+
+AppImage:
+  arch: x86_64
+  update-information: guess
diff --git a/appimage/build_appimage.sh b/appimage/build_appimage.sh
new file mode 100755
index 0000000..c8d7c29
--- /dev/null
+++ b/appimage/build_appimage.sh
@@ -0,0 +1,149 @@
+#!/bin/bash
+# AppImage Build Script for Skylight Wallet
+#
+# Usage: ./build_appimage.sh --version <version>
+#
+# This script builds a Linux AppImage with integrity verification.
+# 
+# To update the expected SHA256 hash:
+# 1. Visit: https://github.com/probonopd/go-appimage/releases
+# 2. Download appimagetool-x86_64.AppImage
+# 3. Run: sha256sum appimagetool-x86_64.AppImage
+# 4. Update EXPECTED_SHA256 variable below
+#
+# Or verify manually before first run:
+# wget https://github.com/probonopd/go-appimage/releases/download/continuous/appimagetool-x86_64.AppImage
+# sha256sum appimagetool-x86_64.AppImage
+# # Compare with hash from trusted source
+
+set -e
+
+# Parse command line arguments
+VERSION=""
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        -v|--version)
+            VERSION="$2"
+            shift 2
+            ;;
+        -h|--help)
+            echo "Usage: $0 --version <version>"
+            echo ""
+            echo "Arguments:"
+            echo "  -v, --version    Version string for the AppImage (required)"
+            echo "  -h, --help       Show this help message"
+            echo ""
+            echo "Example:"
+            echo "  $0 --version 1.0.0"
+            exit 0
+            ;;
+        *)
+            echo "Unknown option: $1"
+            echo "Use --help for usage information"
+            exit 1
+            ;;
+    esac
+done
+
+# Check if version is provided
+if [ -z "$VERSION" ]; then
+    echo "Error: --version is required"
+    echo "Usage: $0 --version <version>"
+    echo "Example: $0 --version 1.0.0"
+    exit 1
+fi
+
+echo "Building AppImage version: $VERSION"
+
+# Get the project root directory (parent of appimage folder)
+PROJECT_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+cd "$PROJECT_ROOT"
+
+echo "Building Flutter Linux app..."
+flutter build linux --release
+
+echo "Creating AppImage structure..."
+cd appimage
+rm -rf AppDir || true
+mkdir -p AppDir/usr/bin
+mkdir -p AppDir/usr/lib
+mkdir -p AppDir/usr/share/icons/hicolor/512x512/apps
+mkdir -p AppDir/usr/share/applications
+
+# Copy the Flutter bundle
+echo "Copying Flutter bundle..."
+cp -r ../build/linux/x64/release/bundle/* AppDir/usr/bin/
+
+# Copy icon
+echo "Copying icon..."
+cp ../linux/launcher_icon.png AppDir/usr/share/icons/hicolor/512x512/apps/skylight_wallet.png
+cp ../linux/launcher_icon.png AppDir/skylight_wallet.png
+
+# Copy desktop file
+echo "Creating desktop entry..."
+cp skylight_wallet.desktop AppDir/usr/share/applications/
+cp skylight_wallet.desktop AppDir/
+
+# Create AppRun
+echo "Creating AppRun..."
+cat > AppDir/AppRun << 'EOF'
+#!/bin/bash
+SELF=$(readlink -f "$0")
+HERE=${SELF%/*}
+export PATH="${HERE}/usr/bin/:${HERE}/usr/sbin/:${HERE}/usr/games/:${HERE}/bin/:${HERE}/sbin/${PATH:+:$PATH}"
+export LD_LIBRARY_PATH="${HERE}/usr/lib/:${HERE}/usr/lib/i386-linux-gnu/:${HERE}/usr/lib/x86_64-linux-gnu/:${HERE}/usr/lib32/:${HERE}/usr/lib64/${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"
+export XDG_DATA_DIRS="${HERE}/usr/share/${XDG_DATA_DIRS:+:$XDG_DATA_DIRS}"
+EXEC="${HERE}/usr/bin/skylight_wallet"
+exec "${EXEC}" "$@"
+EOF
+
+chmod +x AppDir/AppRun
+
+# Expected SHA256 hash - update this when updating appimagetool
+# Verify from: https://github.com/probonopd/go-appimage/releases
+# Run: sha256sum appimagetool-x86_64.AppImage
+EXPECTED_SHA256="0269abb1084fd4c23198c47a230874f7e5b666c9791b6be72cd3553f64200fbc"
+APPIMAGETOOL_FILENAME="appimagetool-911-x86_64.AppImage"
+
+# Download appimagetool from go-appimage if not present
+if [ ! -f "$APPIMAGETOOL_FILENAME" ]; then
+    echo "Downloading appimagetool (go-appimage)..."
+    wget -q --show-progress "https://github.com/probonopd/go-appimage/releases/download/continuous/$APPIMAGETOOL_FILENAME"
+    chmod +x $APPIMAGETOOL_FILENAME
+fi
+
+# Verify integrity
+echo "Verifying appimagetool integrity..."
+ACTUAL_SHA256=$(sha256sum $APPIMAGETOOL_FILENAME | awk '{print $1}')
+
+if [ "$ACTUAL_SHA256" != "$EXPECTED_SHA256" ]; then
+    echo "⚠ ERROR: SHA256 hash mismatch!"
+    echo "Expected: $EXPECTED_SHA256"
+    echo "Got:      $ACTUAL_SHA256"
+    echo ""
+    echo "Either the file is corrupted/tampered, or a new version was released."
+    echo "Verify the hash manually and update EXPECTED_SHA256 in the script if needed."
+    exit 1
+fi
+
+echo "✓ Integrity verified"
+
+# Build the AppImage
+echo "Packaging AppImage..."
+export VERSION
+export ARCH=x86_64
+./$APPIMAGETOOL_FILENAME AppDir
+
+# Clean up temporary files
+echo "Cleaning up..."
+rm -rf AppDir
+
+echo ""
+echo "✓ AppImage created successfully!"
+APPIMAGE_FILE=$(ls -1 skylight-wallet-v${VERSION}-*.AppImage 2>/dev/null | head -n1)
+if [ -n "$APPIMAGE_FILE" ]; then
+    echo "Output: $APPIMAGE_FILE"
+    echo "Run with: ./appimage/$APPIMAGE_FILE"
+else
+    echo "Output: Check appimage/ directory for skylight-wallet-v${VERSION}-*.AppImage"
+fi
diff --git a/appimage/skylight_wallet.desktop b/appimage/skylight_wallet.desktop
new file mode 100644
index 0000000..c8c8442
--- /dev/null
+++ b/appimage/skylight_wallet.desktop
@@ -0,0 +1,8 @@
+[Desktop Entry]
+Type=Application
+Name=Skylight Wallet
+Comment=Monero cryptocurrency wallet
+Exec=skylight_wallet
+Icon=skylight_wallet
+Categories=Finance;Network;
+Terminal=false
diff --git a/linux/CMakeLists.txt b/linux/CMakeLists.txt
index 2758fb1..414d384 100644
--- a/linux/CMakeLists.txt
+++ b/linux/CMakeLists.txt
@@ -98,6 +98,10 @@ install(TARGETS ${BINARY_NAME} RUNTIME DESTINATION "${CMAKE_INSTALL_PREFIX}"
 install(FILES "${FLUTTER_ICU_DATA_FILE}" DESTINATION "${INSTALL_BUNDLE_DATA_DIR}"
   COMPONENT Runtime)
 
+install(FILES "${CMAKE_CURRENT_SOURCE_DIR}/launcher_icon.png" 
+  DESTINATION "${INSTALL_BUNDLE_DATA_DIR}"
+  COMPONENT Runtime)
+
 install(FILES "${FLUTTER_LIBRARY}" DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
   COMPONENT Runtime)
 
diff --git a/linux/launcher_icon.png b/linux/launcher_icon.png
new file mode 100644
index 0000000..b2f8cb5
Binary files /dev/null and b/linux/launcher_icon.png differ
diff --git a/linux/runner/my_application.cc b/linux/runner/my_application.cc
index 8f54899..332896a 100644
--- a/linux/runner/my_application.cc
+++ b/linux/runner/my_application.cc
@@ -48,6 +48,20 @@ static void my_application_activate(GApplication* application) {
   }
 
   gtk_window_set_default_size(window, 1280, 720);
+  
+  // Set window icon - construct path relative to executable
+  g_autofree gchar* exe_path = g_file_read_link("/proc/self/exe", nullptr);
+  if (exe_path != nullptr) {
+    g_autofree gchar* exe_dir = g_path_get_dirname(exe_path);
+    g_autofree gchar* icon_path = g_build_filename(exe_dir, "data", "launcher_icon.png", nullptr);
+    
+    g_autoptr(GError) icon_error = nullptr;
+    gtk_window_set_icon_from_file(window, icon_path, &icon_error);
+    if (icon_error != nullptr) {
+      g_warning("Failed to set window icon from %s: %s", icon_path, icon_error->message);
+    }
+  }
+  
   gtk_widget_show(GTK_WIDGET(window));
 
   g_autoptr(FlDartProject) project = fl_dart_project_new();
diff --git a/pubspec.lock b/pubspec.lock
index bdd51b4..b5d1227 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -441,10 +441,10 @@ packages:
     dependency: transitive
     description:
       name: meta
-      sha256: e3641ec5d63ebf0d9b41bd43201a66e3fc79a65db5f61fc181f04cd27aab950c
+      sha256: "23f08335362185a5ea2ad3a4e597f1375e78bce8a040df5c600c8d3552ef2394"
       url: "https://pub.dev"
     source: hosted
-    version: "1.16.0"
+    version: "1.17.0"
   mime:
     dependency: transitive
     description:
@@ -855,10 +855,10 @@ packages:
     dependency: transitive
     description:
       name: test_api
-      sha256: "522f00f556e73044315fa4585ec3270f1808a4b186c936e612cab0b565ff1e00"
+      sha256: ab2726c1a94d3176a45960b6234466ec367179b87dd74f1611adb1f3b5fb9d55
       url: "https://pub.dev"
     source: hosted
-    version: "0.7.6"
+    version: "0.7.7"
   timeago:
     dependency: "direct main"
     description: