ci: add AppImage builds and full platform coverage for campfire and stack_duo

diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index ea994cb..3036f07 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -687,3 +687,929 @@ jobs:
           name: stack_wallet-flatpak-x86_64-${{ steps.ver.outputs.version }}.flatpak
           path: stack_wallet-flatpak-x86_64-${{ steps.ver.outputs.version }}.flatpak
 
+  build-appimage:
+    runs-on: ubuntu-24.04
+    needs: build-linux
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Set version
+        id: ver
+        run: |
+          if [ "${{ github.ref_type }}" = "tag" ]; then
+            VERSION="${{ github.ref_name }}"
+            VERSION="${VERSION#v}"
+          elif [ -n "${{ inputs.version }}" ]; then
+            VERSION="${{ inputs.version }}"
+          else
+            VERSION="0.0.0-staging.${{ github.run_number }}"
+          fi
+          echo "version=${VERSION}" >> $GITHUB_OUTPUT
+
+      - name: Download Linux bundle
+        uses: actions/download-artifact@v4
+        with:
+          name: stack_wallet-linux-x86_64-${{ steps.ver.outputs.version }}.tar.gz
+
+      - name: Install AppImage tools
+        run: |
+          sudo apt-get update -q
+          sudo apt-get install -y squashfs-tools
+
+      - name: Build AppImage
+        run: |
+          VERSION="${{ steps.ver.outputs.version }}"
+          tar -xzf "stack_wallet-linux-x86_64-${VERSION}.tar.gz"
+          mkdir -p AppDir
+          cp -r bundle/* AppDir/
+          cp appimage/stack_wallet/AppRun AppDir/AppRun
+          chmod +x AppDir/AppRun
+          cp appimage/stack_wallet/stack_wallet.desktop AppDir/
+          cp asset_sources/icon/stack_wallet/icon.png AppDir/stack_wallet.png
+          curl -fsSL -o appimagetool \
+            https://github.com/AppImage/AppImageKit/releases/download/continuous/appimagetool-x86_64.AppImage
+          chmod +x appimagetool
+          ARCH=x86_64 ./appimagetool --appimage-extract-and-run AppDir \
+            "stack_wallet-appimage-x86_64-${VERSION}.AppImage"
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: stack_wallet-appimage-x86_64-${{ steps.ver.outputs.version }}.AppImage
+          path: stack_wallet-appimage-x86_64-${{ steps.ver.outputs.version }}.AppImage
+
+  build-campfire-android:
+    runs-on: ubuntu-24.04
+    permissions:
+      contents: read
+      packages: read
+    container:
+      image: ghcr.io/${{ github.repository_owner }}/stackwallet-ci:latest
+      credentials:
+        username: ${{ github.actor }}
+        password: ${{ github.token }}
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+          submodules: recursive
+
+      - name: Set version
+        id: ver
+        run: |
+          if [ "${{ github.ref_type }}" = "tag" ]; then
+            VERSION="${{ github.ref_name }}"
+            VERSION="${VERSION#v}"
+            BUILD_NUMBER="${{ github.run_number }}"
+          elif [ -n "${{ inputs.version }}" ]; then
+            VERSION="${{ inputs.version }}"
+            BUILD_NUMBER="${{ inputs.build_number }}"
+          else
+            VERSION="0.0.0-staging.${{ github.run_number }}"
+            BUILD_NUMBER="${{ github.run_number }}"
+          fi
+          echo "version=${VERSION}" >> $GITHUB_OUTPUT
+          echo "build_number=${BUILD_NUMBER}" >> $GITHUB_OUTPUT
+
+      - name: Configure app
+        run: |
+          cd scripts
+          echo "yes" | ./build_app.sh \
+            -v "${{ steps.ver.outputs.version }}" \
+            -b "${{ steps.ver.outputs.build_number }}" \
+            -p android -a campfire -d -s
+
+      - name: Get dependencies
+        run: flutter pub get
+
+      - name: Decode secrets
+        env:
+          CHANGE_NOW: ${{ secrets.CHANGE_NOW }}
+        run: echo "$CHANGE_NOW" | base64 --decode > lib/external_api_keys.dart
+
+      - name: Set up Android local.properties
+        run: |
+          cat > android/local.properties <<EOF
+          sdk.dir=${ANDROID_SDK_ROOT}
+          flutter.sdk=${FLUTTER_HOME}
+          EOF
+
+      - name: Set up signing
+        env:
+          KEYSTORE_BASE64: ${{ secrets.ANDROID_KEYSTORE_BASE64 }}
+        run: |
+          printf '%s' "$KEYSTORE_BASE64" | base64 --decode > android/keystore-orig.jks
+          [ -s android/keystore-orig.jks ] || { echo "ERROR: ANDROID_KEYSTORE_BASE64 secret is empty or not set"; exit 1; }
+          keytool -importkeystore \
+            -srckeystore android/keystore-orig.jks \
+            -destkeystore android/keystore.jks \
+            -deststoretype pkcs12 \
+            -srcstorepass "${{ secrets.ANDROID_STORE_PASSWORD }}" \
+            -deststorepass "${{ secrets.ANDROID_STORE_PASSWORD }}" \
+            -noprompt \
+            -J-Dkeystore.pkcs12.legacy
+          rm android/keystore-orig.jks
+          cat > android/key.properties <<EOF
+          storeFile=../keystore.jks
+          storePassword=${{ secrets.ANDROID_STORE_PASSWORD }}
+          keyPassword=${{ secrets.ANDROID_KEY_PASSWORD }}
+          keyAlias=${{ secrets.ANDROID_KEY_ALIAS }}
+          EOF
+
+      - name: Build APKs
+        run: flutter build apk --split-per-abi --release
+
+      - name: Build AAB
+        run: flutter build appbundle --release
+
+      - name: Collect artifacts
+        run: |
+          VERSION="${{ steps.ver.outputs.version }}"
+          mkdir -p android-artifacts
+          cp build/app/outputs/flutter-apk/app-arm64-v8a-release.apk \
+             android-artifacts/campfire-android-arm64-v8a-${VERSION}.apk
+          cp build/app/outputs/flutter-apk/app-armeabi-v7a-release.apk \
+             android-artifacts/campfire-android-armeabi-v7a-${VERSION}.apk
+          cp build/app/outputs/flutter-apk/app-x86_64-release.apk \
+             android-artifacts/campfire-android-x86_64-${VERSION}.apk
+          cp build/app/outputs/bundle/release/app-release.aab \
+             android-artifacts/campfire-android-${VERSION}.aab
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: campfire-android-${{ steps.ver.outputs.version }}
+          path: android-artifacts/
+
+  build-campfire-windows:
+    runs-on: windows-2022
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+          submodules: recursive
+
+      - name: Set version
+        id: ver
+        run: |
+          if [ "${{ github.ref_type }}" = "tag" ]; then
+            VERSION="${{ github.ref_name }}"
+            VERSION="${VERSION#v}"
+            BUILD_NUMBER="${{ github.run_number }}"
+          elif [ -n "${{ inputs.version }}" ]; then
+            VERSION="${{ inputs.version }}"
+            BUILD_NUMBER="${{ inputs.build_number }}"
+          else
+            VERSION="0.0.0-staging.${{ github.run_number }}"
+            BUILD_NUMBER="${{ github.run_number }}"
+          fi
+          echo "version=${VERSION}" >> $GITHUB_OUTPUT
+          echo "build_number=${BUILD_NUMBER}" >> $GITHUB_OUTPUT
+
+      - uses: subosito/flutter-action@v2
+        with:
+          flutter-version: '3.38.1'
+          channel: 'stable'
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.24.13'
+
+      - name: Flutter doctor
+        run: flutter doctor -v
+
+      - name: Configure app
+        run: |
+          cd scripts
+          echo "yes" | ./build_app.sh \
+            -v "${{ steps.ver.outputs.version }}" \
+            -b "${{ steps.ver.outputs.build_number }}" \
+            -p windows -a campfire -d -s
+
+      - name: Replace asset symlinks with copies (CI workaround)
+        run: |
+          set -euo pipefail
+          for dirname in default_themes icon lottie in_app_logo_icons svg; do
+            target="assets/${dirname}"
+            source="asset_sources/${dirname}/campfire"
+            if [ -e "$target" ] || [ -L "$target" ]; then
+              cmd.exe /c rmdir "$(cygpath -w "$target")" 2>/dev/null || rm -rf "$target"
+            fi
+            mkdir -p "$target"
+            cp -r "${source}/." "$target/"
+          done
+
+      - name: Get dependencies
+        run: flutter pub get
+
+      - name: Decode secrets
+        env:
+          CHANGE_NOW: ${{ secrets.CHANGE_NOW }}
+        run: echo "$CHANGE_NOW" | base64 --decode > lib/external_api_keys.dart
+
+      - name: Build secp256k1.dll for Windows
+        run: dart run coinlib:build_windows
+
+      - name: Build
+        run: flutter build windows --release
+
+      - name: Package
+        shell: pwsh
+        run: |
+          Compress-Archive -Path "build/windows/x64/runner/Release/*" `
+            -DestinationPath "campfire-windows-x86_64-${{ steps.ver.outputs.version }}.zip"
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: campfire-windows-x86_64-${{ steps.ver.outputs.version }}.zip
+          path: campfire-windows-x86_64-${{ steps.ver.outputs.version }}.zip
+
+  build-campfire-macos:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+          submodules: recursive
+
+      - name: Set version
+        id: ver
+        run: |
+          if [ "${{ github.ref_type }}" = "tag" ]; then
+            VERSION="${{ github.ref_name }}"
+            VERSION="${VERSION#v}"
+            BUILD_NUMBER="${{ github.run_number }}"
+          elif [ -n "${{ inputs.version }}" ]; then
+            VERSION="${{ inputs.version }}"
+            BUILD_NUMBER="${{ inputs.build_number }}"
+          else
+            VERSION="0.0.0-staging.${{ github.run_number }}"
+            BUILD_NUMBER="${{ github.run_number }}"
+          fi
+          echo "version=${VERSION}" >> $GITHUB_OUTPUT
+          echo "build_number=${BUILD_NUMBER}" >> $GITHUB_OUTPUT
+
+      - uses: subosito/flutter-action@v2
+        with:
+          flutter-version: '3.38.1'
+          channel: 'stable'
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.24.13'
+
+      - name: Configure app
+        run: |
+          cd scripts
+          echo "yes" | ./build_app.sh \
+            -v "${{ steps.ver.outputs.version }}" \
+            -b "${{ steps.ver.outputs.build_number }}" \
+            -p macos -a campfire -d -s
+
+      - name: Get dependencies
+        run: flutter pub get
+
+      - name: Decode secrets
+        env:
+          CHANGE_NOW: ${{ secrets.CHANGE_NOW }}
+        run: echo "$CHANGE_NOW" | base64 --decode > lib/external_api_keys.dart
+
+      - name: Build
+        run: flutter build macos --release
+
+      - name: Package
+        run: |
+          cd "build/macos/Build/Products/Release"
+          zip -r "$GITHUB_WORKSPACE/campfire-macos-aarch64-${{ steps.ver.outputs.version }}.zip" \
+            "Campfire.app"
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: campfire-macos-aarch64-${{ steps.ver.outputs.version }}.zip
+          path: campfire-macos-aarch64-${{ steps.ver.outputs.version }}.zip
+
+  build-campfire-ios:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+          submodules: recursive
+
+      - name: Set version
+        id: ver
+        run: |
+          if [ "${{ github.ref_type }}" = "tag" ]; then
+            VERSION="${{ github.ref_name }}"
+            VERSION="${VERSION#v}"
+            BUILD_NUMBER="${{ github.run_number }}"
+          elif [ -n "${{ inputs.version }}" ]; then
+            VERSION="${{ inputs.version }}"
+            BUILD_NUMBER="${{ inputs.build_number }}"
+          else
+            VERSION="0.0.0-staging.${{ github.run_number }}"
+            BUILD_NUMBER="${{ github.run_number }}"
+          fi
+          echo "version=${VERSION}" >> $GITHUB_OUTPUT
+          echo "build_number=${BUILD_NUMBER}" >> $GITHUB_OUTPUT
+
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: stable
+          targets: aarch64-apple-ios
+
+      - uses: subosito/flutter-action@v2
+        with:
+          flutter-version: '3.38.1'
+          channel: 'stable'
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.24.13'
+
+      - name: Configure app
+        run: |
+          cd scripts
+          echo "yes" | ./build_app.sh \
+            -v "${{ steps.ver.outputs.version }}" \
+            -b "${{ steps.ver.outputs.build_number }}" \
+            -p ios -a campfire -d -s
+
+      - name: Get dependencies
+        run: flutter pub get
+
+      - name: Decode secrets
+        env:
+          CHANGE_NOW: ${{ secrets.CHANGE_NOW }}
+        run: echo "$CHANGE_NOW" | base64 --decode > lib/external_api_keys.dart
+
+      - name: Build
+        run: flutter build ios --release --no-codesign
+
+      - name: Package IPA
+        run: |
+          mkdir Payload
+          cp -r build/ios/iphoneos/Runner.app Payload/
+          zip -r "campfire-ios-aarch64-${{ steps.ver.outputs.version }}.ipa" Payload/
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: campfire-ios-aarch64-${{ steps.ver.outputs.version }}.ipa
+          path: campfire-ios-aarch64-${{ steps.ver.outputs.version }}.ipa
+
+  build-campfire-flatpak:
+    runs-on: ubuntu-24.04
+    needs: build-campfire-linux
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Set version
+        id: ver
+        run: |
+          if [ "${{ github.ref_type }}" = "tag" ]; then
+            VERSION="${{ github.ref_name }}"
+            VERSION="${VERSION#v}"
+          elif [ -n "${{ inputs.version }}" ]; then
+            VERSION="${{ inputs.version }}"
+          else
+            VERSION="0.0.0-staging.${{ github.run_number }}"
+          fi
+          echo "version=${VERSION}" >> $GITHUB_OUTPUT
+
+      - name: Download Linux bundle
+        uses: actions/download-artifact@v4
+        with:
+          name: campfire-linux-x86_64-${{ steps.ver.outputs.version }}.tar.gz
+
+      - name: Stage bundle and icon
+        run: |
+          tar -xzf "campfire-linux-x86_64-${{ steps.ver.outputs.version }}.tar.gz" -C flatpak/
+          cp asset_sources/icon/campfire/icon.png flatpak/com.cypherstack.campfire.png
+
+      - name: Install Flatpak tools
+        run: |
+          sudo apt-get update -q
+          sudo apt-get install -y flatpak flatpak-builder
+
+      - name: Set up Flathub remote
+        run: flatpak remote-add --user --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
+
+      - name: Cache Flatpak SDK
+        uses: actions/cache@v4
+        with:
+          path: ~/.local/share/flatpak
+          key: flatpak-freedesktop-24.08-v1
+
+      - name: Install Flatpak SDK
+        run: |
+          flatpak install --user --noninteractive flathub \
+            org.freedesktop.Platform//24.08 \
+            org.freedesktop.Sdk//24.08
+
+      - name: Build Flatpak
+        run: |
+          flatpak-builder --user --force-clean \
+            --repo=flatpak-repo \
+            build-flatpak flatpak/com.cypherstack.campfire.yaml
+
+      - name: Bundle Flatpak
+        run: |
+          flatpak build-bundle flatpak-repo \
+            --runtime-repo=https://flathub.org/repo/flathub.flatpakrepo \
+            "campfire-flatpak-x86_64-${{ steps.ver.outputs.version }}.flatpak" \
+            com.cypherstack.campfire
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: campfire-flatpak-x86_64-${{ steps.ver.outputs.version }}.flatpak
+          path: campfire-flatpak-x86_64-${{ steps.ver.outputs.version }}.flatpak
+
+  build-campfire-appimage:
+    runs-on: ubuntu-24.04
+    needs: build-campfire-linux
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Set version
+        id: ver
+        run: |
+          if [ "${{ github.ref_type }}" = "tag" ]; then
+            VERSION="${{ github.ref_name }}"
+            VERSION="${VERSION#v}"
+          elif [ -n "${{ inputs.version }}" ]; then
+            VERSION="${{ inputs.version }}"
+          else
+            VERSION="0.0.0-staging.${{ github.run_number }}"
+          fi
+          echo "version=${VERSION}" >> $GITHUB_OUTPUT
+
+      - name: Download Linux bundle
+        uses: actions/download-artifact@v4
+        with:
+          name: campfire-linux-x86_64-${{ steps.ver.outputs.version }}.tar.gz
+
+      - name: Install AppImage tools
+        run: |
+          sudo apt-get update -q
+          sudo apt-get install -y squashfs-tools
+
+      - name: Build AppImage
+        run: |
+          VERSION="${{ steps.ver.outputs.version }}"
+          tar -xzf "campfire-linux-x86_64-${VERSION}.tar.gz"
+          mkdir -p AppDir
+          cp -r bundle/* AppDir/
+          cp appimage/campfire/AppRun AppDir/AppRun
+          chmod +x AppDir/AppRun
+          cp appimage/campfire/campfire.desktop AppDir/
+          cp asset_sources/icon/campfire/icon.png AppDir/campfire.png
+          curl -fsSL -o appimagetool \
+            https://github.com/AppImage/AppImageKit/releases/download/continuous/appimagetool-x86_64.AppImage
+          chmod +x appimagetool
+          ARCH=x86_64 ./appimagetool --appimage-extract-and-run AppDir \
+            "campfire-appimage-x86_64-${VERSION}.AppImage"
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: campfire-appimage-x86_64-${{ steps.ver.outputs.version }}.AppImage
+          path: campfire-appimage-x86_64-${{ steps.ver.outputs.version }}.AppImage
+
+  build-stack-duo-android:
+    runs-on: ubuntu-24.04
+    permissions:
+      contents: read
+      packages: read
+    container:
+      image: ghcr.io/${{ github.repository_owner }}/stackwallet-ci:latest
+      credentials:
+        username: ${{ github.actor }}
+        password: ${{ github.token }}
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+          submodules: recursive
+
+      - name: Set version
+        id: ver
+        run: |
+          if [ "${{ github.ref_type }}" = "tag" ]; then
+            VERSION="${{ github.ref_name }}"
+            VERSION="${VERSION#v}"
+            BUILD_NUMBER="${{ github.run_number }}"
+          elif [ -n "${{ inputs.version }}" ]; then
+            VERSION="${{ inputs.version }}"
+            BUILD_NUMBER="${{ inputs.build_number }}"
+          else
+            VERSION="0.0.0-staging.${{ github.run_number }}"
+            BUILD_NUMBER="${{ github.run_number }}"
+          fi
+          echo "version=${VERSION}" >> $GITHUB_OUTPUT
+          echo "build_number=${BUILD_NUMBER}" >> $GITHUB_OUTPUT
+
+      - name: Configure app
+        run: |
+          cd scripts
+          echo "yes" | ./build_app.sh \
+            -v "${{ steps.ver.outputs.version }}" \
+            -b "${{ steps.ver.outputs.build_number }}" \
+            -p android -a stack_duo -d -s
+
+      - name: Get dependencies
+        run: flutter pub get
+
+      - name: Decode secrets
+        env:
+          CHANGE_NOW: ${{ secrets.CHANGE_NOW }}
+        run: echo "$CHANGE_NOW" | base64 --decode > lib/external_api_keys.dart
+
+      - name: Set up Android local.properties
+        run: |
+          cat > android/local.properties <<EOF
+          sdk.dir=${ANDROID_SDK_ROOT}
+          flutter.sdk=${FLUTTER_HOME}
+          EOF
+
+      - name: Set up signing
+        env:
+          KEYSTORE_BASE64: ${{ secrets.ANDROID_KEYSTORE_BASE64 }}
+        run: |
+          printf '%s' "$KEYSTORE_BASE64" | base64 --decode > android/keystore-orig.jks
+          [ -s android/keystore-orig.jks ] || { echo "ERROR: ANDROID_KEYSTORE_BASE64 secret is empty or not set"; exit 1; }
+          keytool -importkeystore \
+            -srckeystore android/keystore-orig.jks \
+            -destkeystore android/keystore.jks \
+            -deststoretype pkcs12 \
+            -srcstorepass "${{ secrets.ANDROID_STORE_PASSWORD }}" \
+            -deststorepass "${{ secrets.ANDROID_STORE_PASSWORD }}" \
+            -noprompt \
+            -J-Dkeystore.pkcs12.legacy
+          rm android/keystore-orig.jks
+          cat > android/key.properties <<EOF
+          storeFile=../keystore.jks
+          storePassword=${{ secrets.ANDROID_STORE_PASSWORD }}
+          keyPassword=${{ secrets.ANDROID_KEY_PASSWORD }}
+          keyAlias=${{ secrets.ANDROID_KEY_ALIAS }}
+          EOF
+
+      - name: Build APKs
+        run: flutter build apk --split-per-abi --release
+
+      - name: Build AAB
+        run: flutter build appbundle --release
+
+      - name: Collect artifacts
+        run: |
+          VERSION="${{ steps.ver.outputs.version }}"
+          mkdir -p android-artifacts
+          cp build/app/outputs/flutter-apk/app-arm64-v8a-release.apk \
+             android-artifacts/stack_duo-android-arm64-v8a-${VERSION}.apk
+          cp build/app/outputs/flutter-apk/app-armeabi-v7a-release.apk \
+             android-artifacts/stack_duo-android-armeabi-v7a-${VERSION}.apk
+          cp build/app/outputs/flutter-apk/app-x86_64-release.apk \
+             android-artifacts/stack_duo-android-x86_64-${VERSION}.apk
+          cp build/app/outputs/bundle/release/app-release.aab \
+             android-artifacts/stack_duo-android-${VERSION}.aab
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: stack_duo-android-${{ steps.ver.outputs.version }}
+          path: android-artifacts/
+
+  build-stack-duo-windows:
+    runs-on: windows-2022
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+          submodules: recursive
+
+      - name: Set version
+        id: ver
+        run: |
+          if [ "${{ github.ref_type }}" = "tag" ]; then
+            VERSION="${{ github.ref_name }}"
+            VERSION="${VERSION#v}"
+            BUILD_NUMBER="${{ github.run_number }}"
+          elif [ -n "${{ inputs.version }}" ]; then
+            VERSION="${{ inputs.version }}"
+            BUILD_NUMBER="${{ inputs.build_number }}"
+          else
+            VERSION="0.0.0-staging.${{ github.run_number }}"
+            BUILD_NUMBER="${{ github.run_number }}"
+          fi
+          echo "version=${VERSION}" >> $GITHUB_OUTPUT
+          echo "build_number=${BUILD_NUMBER}" >> $GITHUB_OUTPUT
+
+      - uses: subosito/flutter-action@v2
+        with:
+          flutter-version: '3.38.1'
+          channel: 'stable'
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.24.13'
+
+      - name: Flutter doctor
+        run: flutter doctor -v
+
+      - name: Configure app
+        run: |
+          cd scripts
+          echo "yes" | ./build_app.sh \
+            -v "${{ steps.ver.outputs.version }}" \
+            -b "${{ steps.ver.outputs.build_number }}" \
+            -p windows -a stack_duo -d -s
+
+      - name: Replace asset symlinks with copies (CI workaround)
+        run: |
+          set -euo pipefail
+          for dirname in default_themes icon lottie in_app_logo_icons svg; do
+            target="assets/${dirname}"
+            source="asset_sources/${dirname}/stack_duo"
+            if [ -e "$target" ] || [ -L "$target" ]; then
+              cmd.exe /c rmdir "$(cygpath -w "$target")" 2>/dev/null || rm -rf "$target"
+            fi
+            mkdir -p "$target"
+            cp -r "${source}/." "$target/"
+          done
+
+      - name: Get dependencies
+        run: flutter pub get
+
+      - name: Decode secrets
+        env:
+          CHANGE_NOW: ${{ secrets.CHANGE_NOW }}
+        run: echo "$CHANGE_NOW" | base64 --decode > lib/external_api_keys.dart
+
+      - name: Build secp256k1.dll for Windows
+        run: dart run coinlib:build_windows
+
+      - name: Build
+        run: flutter build windows --release
+
+      - name: Package
+        shell: pwsh
+        run: |
+          Compress-Archive -Path "build/windows/x64/runner/Release/*" `
+            -DestinationPath "stack_duo-windows-x86_64-${{ steps.ver.outputs.version }}.zip"
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: stack_duo-windows-x86_64-${{ steps.ver.outputs.version }}.zip
+          path: stack_duo-windows-x86_64-${{ steps.ver.outputs.version }}.zip
+
+  build-stack-duo-macos:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+          submodules: recursive
+
+      - name: Set version
+        id: ver
+        run: |
+          if [ "${{ github.ref_type }}" = "tag" ]; then
+            VERSION="${{ github.ref_name }}"
+            VERSION="${VERSION#v}"
+            BUILD_NUMBER="${{ github.run_number }}"
+          elif [ -n "${{ inputs.version }}" ]; then
+            VERSION="${{ inputs.version }}"
+            BUILD_NUMBER="${{ inputs.build_number }}"
+          else
+            VERSION="0.0.0-staging.${{ github.run_number }}"
+            BUILD_NUMBER="${{ github.run_number }}"
+          fi
+          echo "version=${VERSION}" >> $GITHUB_OUTPUT
+          echo "build_number=${BUILD_NUMBER}" >> $GITHUB_OUTPUT
+
+      - uses: subosito/flutter-action@v2
+        with:
+          flutter-version: '3.38.1'
+          channel: 'stable'
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.24.13'
+
+      - name: Configure app
+        run: |
+          cd scripts
+          echo "yes" | ./build_app.sh \
+            -v "${{ steps.ver.outputs.version }}" \
+            -b "${{ steps.ver.outputs.build_number }}" \
+            -p macos -a stack_duo -d -s
+
+      - name: Get dependencies
+        run: flutter pub get
+
+      - name: Decode secrets
+        env:
+          CHANGE_NOW: ${{ secrets.CHANGE_NOW }}
+        run: echo "$CHANGE_NOW" | base64 --decode > lib/external_api_keys.dart
+
+      - name: Build
+        run: flutter build macos --release
+
+      - name: Package
+        run: |
+          cd "build/macos/Build/Products/Release"
+          zip -r "$GITHUB_WORKSPACE/stack_duo-macos-aarch64-${{ steps.ver.outputs.version }}.zip" \
+            "Stack Duo.app"
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: stack_duo-macos-aarch64-${{ steps.ver.outputs.version }}.zip
+          path: stack_duo-macos-aarch64-${{ steps.ver.outputs.version }}.zip
+
+  build-stack-duo-ios:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+          submodules: recursive
+
+      - name: Set version
+        id: ver
+        run: |
+          if [ "${{ github.ref_type }}" = "tag" ]; then
+            VERSION="${{ github.ref_name }}"
+            VERSION="${VERSION#v}"
+            BUILD_NUMBER="${{ github.run_number }}"
+          elif [ -n "${{ inputs.version }}" ]; then
+            VERSION="${{ inputs.version }}"
+            BUILD_NUMBER="${{ inputs.build_number }}"
+          else
+            VERSION="0.0.0-staging.${{ github.run_number }}"
+            BUILD_NUMBER="${{ github.run_number }}"
+          fi
+          echo "version=${VERSION}" >> $GITHUB_OUTPUT
+          echo "build_number=${BUILD_NUMBER}" >> $GITHUB_OUTPUT
+
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: stable
+          targets: aarch64-apple-ios
+
+      - uses: subosito/flutter-action@v2
+        with:
+          flutter-version: '3.38.1'
+          channel: 'stable'
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.24.13'
+
+      - name: Configure app
+        run: |
+          cd scripts
+          echo "yes" | ./build_app.sh \
+            -v "${{ steps.ver.outputs.version }}" \
+            -b "${{ steps.ver.outputs.build_number }}" \
+            -p ios -a stack_duo -d -s
+
+      - name: Get dependencies
+        run: flutter pub get
+
+      - name: Decode secrets
+        env:
+          CHANGE_NOW: ${{ secrets.CHANGE_NOW }}
+        run: echo "$CHANGE_NOW" | base64 --decode > lib/external_api_keys.dart
+
+      - name: Build
+        run: flutter build ios --release --no-codesign
+
+      - name: Package IPA
+        run: |
+          mkdir Payload
+          cp -r build/ios/iphoneos/Runner.app Payload/
+          zip -r "stack_duo-ios-aarch64-${{ steps.ver.outputs.version }}.ipa" Payload/
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: stack_duo-ios-aarch64-${{ steps.ver.outputs.version }}.ipa
+          path: stack_duo-ios-aarch64-${{ steps.ver.outputs.version }}.ipa
+
+  build-stack-duo-flatpak:
+    runs-on: ubuntu-24.04
+    needs: build-stack-duo-linux
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Set version
+        id: ver
+        run: |
+          if [ "${{ github.ref_type }}" = "tag" ]; then
+            VERSION="${{ github.ref_name }}"
+            VERSION="${VERSION#v}"
+          elif [ -n "${{ inputs.version }}" ]; then
+            VERSION="${{ inputs.version }}"
+          else
+            VERSION="0.0.0-staging.${{ github.run_number }}"
+          fi
+          echo "version=${VERSION}" >> $GITHUB_OUTPUT
+
+      - name: Download Linux bundle
+        uses: actions/download-artifact@v4
+        with:
+          name: stack_duo-linux-x86_64-${{ steps.ver.outputs.version }}.tar.gz
+
+      - name: Stage bundle and icon
+        run: |
+          tar -xzf "stack_duo-linux-x86_64-${{ steps.ver.outputs.version }}.tar.gz" -C flatpak/
+          cp asset_sources/icon/stack_duo/icon.png flatpak/com.cypherstack.stackduo.png
+
+      - name: Install Flatpak tools
+        run: |
+          sudo apt-get update -q
+          sudo apt-get install -y flatpak flatpak-builder
+
+      - name: Set up Flathub remote
+        run: flatpak remote-add --user --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
+
+      - name: Cache Flatpak SDK
+        uses: actions/cache@v4
+        with:
+          path: ~/.local/share/flatpak
+          key: flatpak-freedesktop-24.08-v1
+
+      - name: Install Flatpak SDK
+        run: |
+          flatpak install --user --noninteractive flathub \
+            org.freedesktop.Platform//24.08 \
+            org.freedesktop.Sdk//24.08
+
+      - name: Build Flatpak
+        run: |
+          flatpak-builder --user --force-clean \
+            --repo=flatpak-repo \
+            build-flatpak flatpak/com.cypherstack.stackduo.yaml
+
+      - name: Bundle Flatpak
+        run: |
+          flatpak build-bundle flatpak-repo \
+            --runtime-repo=https://flathub.org/repo/flathub.flatpakrepo \
+            "stack_duo-flatpak-x86_64-${{ steps.ver.outputs.version }}.flatpak" \
+            com.cypherstack.stackduo
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: stack_duo-flatpak-x86_64-${{ steps.ver.outputs.version }}.flatpak
+          path: stack_duo-flatpak-x86_64-${{ steps.ver.outputs.version }}.flatpak
+
+  build-stack-duo-appimage:
+    runs-on: ubuntu-24.04
+    needs: build-stack-duo-linux
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Set version
+        id: ver
+        run: |
+          if [ "${{ github.ref_type }}" = "tag" ]; then
+            VERSION="${{ github.ref_name }}"
+            VERSION="${VERSION#v}"
+          elif [ -n "${{ inputs.version }}" ]; then
+            VERSION="${{ inputs.version }}"
+          else
+            VERSION="0.0.0-staging.${{ github.run_number }}"
+          fi
+          echo "version=${VERSION}" >> $GITHUB_OUTPUT
+
+      - name: Download Linux bundle
+        uses: actions/download-artifact@v4
+        with:
+          name: stack_duo-linux-x86_64-${{ steps.ver.outputs.version }}.tar.gz
+
+      - name: Install AppImage tools
+        run: |
+          sudo apt-get update -q
+          sudo apt-get install -y squashfs-tools
+
+      - name: Build AppImage
+        run: |
+          VERSION="${{ steps.ver.outputs.version }}"
+          tar -xzf "stack_duo-linux-x86_64-${VERSION}.tar.gz"
+          mkdir -p AppDir
+          cp -r bundle/* AppDir/
+          cp appimage/stack_duo/AppRun AppDir/AppRun
+          chmod +x AppDir/AppRun
+          cp appimage/stack_duo/stack_duo.desktop AppDir/
+          cp asset_sources/icon/stack_duo/icon.png AppDir/stack_duo.png
+          curl -fsSL -o appimagetool \
+            https://github.com/AppImage/AppImageKit/releases/download/continuous/appimagetool-x86_64.AppImage
+          chmod +x appimagetool
+          ARCH=x86_64 ./appimagetool --appimage-extract-and-run AppDir \
+            "stack_duo-appimage-x86_64-${VERSION}.AppImage"
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: stack_duo-appimage-x86_64-${{ steps.ver.outputs.version }}.AppImage
+          path: stack_duo-appimage-x86_64-${{ steps.ver.outputs.version }}.AppImage
+
diff --git a/appimage/campfire/AppRun b/appimage/campfire/AppRun
new file mode 100755
index 0000000..2d22d3d
--- /dev/null
+++ b/appimage/campfire/AppRun
@@ -0,0 +1,5 @@
+#!/bin/bash
+SELF=$(readlink -f "$0")
+HERE=${SELF%/*}
+export LD_LIBRARY_PATH="${HERE}/lib:${LD_LIBRARY_PATH}"
+exec "${HERE}/campfire" "$@"
diff --git a/appimage/campfire/campfire.desktop b/appimage/campfire/campfire.desktop
new file mode 100644
index 0000000..71b7b61
--- /dev/null
+++ b/appimage/campfire/campfire.desktop
@@ -0,0 +1,7 @@
+[Desktop Entry]
+Name=Campfire
+Comment=Your privacy. Your wallet. Your Firo.
+Exec=campfire
+Icon=campfire
+Type=Application
+Categories=Finance;
diff --git a/appimage/stack_duo/AppRun b/appimage/stack_duo/AppRun
new file mode 100755
index 0000000..9b8f349
--- /dev/null
+++ b/appimage/stack_duo/AppRun
@@ -0,0 +1,5 @@
+#!/bin/bash
+SELF=$(readlink -f "$0")
+HERE=${SELF%/*}
+export LD_LIBRARY_PATH="${HERE}/lib:${LD_LIBRARY_PATH}"
+exec "${HERE}/stack_duo" "$@"
diff --git a/appimage/stack_duo/stack_duo.desktop b/appimage/stack_duo/stack_duo.desktop
new file mode 100644
index 0000000..64b9f6d
--- /dev/null
+++ b/appimage/stack_duo/stack_duo.desktop
@@ -0,0 +1,7 @@
+[Desktop Entry]
+Name=Stack Duo
+Comment=An open-source, multicoin wallet for everyone
+Exec=stack_duo
+Icon=stack_duo
+Type=Application
+Categories=Finance;
diff --git a/appimage/stack_wallet/AppRun b/appimage/stack_wallet/AppRun
new file mode 100755
index 0000000..6038f4b
--- /dev/null
+++ b/appimage/stack_wallet/AppRun
@@ -0,0 +1,5 @@
+#!/bin/bash
+SELF=$(readlink -f "$0")
+HERE=${SELF%/*}
+export LD_LIBRARY_PATH="${HERE}/lib:${LD_LIBRARY_PATH}"
+exec "${HERE}/stack_wallet" "$@"
diff --git a/appimage/stack_wallet/stack_wallet.desktop b/appimage/stack_wallet/stack_wallet.desktop
new file mode 100644
index 0000000..19c6fcc
--- /dev/null
+++ b/appimage/stack_wallet/stack_wallet.desktop
@@ -0,0 +1,7 @@
+[Desktop Entry]
+Name=Stack Wallet
+Comment=Open-source non-custodial cryptocurrency wallet
+Exec=stack_wallet
+Icon=stack_wallet
+Type=Application
+Categories=Finance;
diff --git a/flatpak/campfire.sh b/flatpak/campfire.sh
new file mode 100644
index 0000000..0bd7154
--- /dev/null
+++ b/flatpak/campfire.sh
@@ -0,0 +1,2 @@
+#!/bin/sh
+exec /app/lib/campfire/campfire "$@"
diff --git a/flatpak/com.cypherstack.campfire.desktop b/flatpak/com.cypherstack.campfire.desktop
new file mode 100644
index 0000000..512ef2c
--- /dev/null
+++ b/flatpak/com.cypherstack.campfire.desktop
@@ -0,0 +1,7 @@
+[Desktop Entry]
+Name=Campfire
+Comment=Your privacy. Your wallet. Your Firo.
+Exec=campfire
+Icon=com.cypherstack.campfire
+Type=Application
+Categories=Finance;
diff --git a/flatpak/com.cypherstack.campfire.metainfo.xml b/flatpak/com.cypherstack.campfire.metainfo.xml
new file mode 100644
index 0000000..f355750
--- /dev/null
+++ b/flatpak/com.cypherstack.campfire.metainfo.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<component type="desktop-application">
+  <id>com.cypherstack.campfire</id>
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>GPL-3.0-only</project_license>
+  <name>Campfire</name>
+  <summary>Your privacy. Your wallet. Your Firo.</summary>
+  <description>
+    <p>
+      Campfire is an open-source, non-custodial Firo wallet.
+    </p>
+  </description>
+  <url type="homepage">https://campfireprivacy.com</url>
+  <url type="bugtracker">https://github.com/cypherstack/stack_wallet/issues</url>
+  <content_rating type="oars-1.1"/>
+</component>
diff --git a/flatpak/com.cypherstack.campfire.yaml b/flatpak/com.cypherstack.campfire.yaml
new file mode 100644
index 0000000..9f8cd9e
--- /dev/null
+++ b/flatpak/com.cypherstack.campfire.yaml
@@ -0,0 +1,33 @@
+app-id: com.cypherstack.campfire
+runtime: org.freedesktop.Platform
+runtime-version: '24.08'
+sdk: org.freedesktop.Sdk
+command: campfire
+
+finish-args:
+  - --share=network
+  - --share=ipc
+  - --socket=fallback-x11
+  - --socket=wayland
+  - --device=dri
+  - --filesystem=~/.campfire
+  - --talk-name=org.freedesktop.secrets
+  - --talk-name=org.freedesktop.Notifications
+
+modules:
+  - name: campfire
+    buildsystem: simple
+    build-commands:
+      - mkdir -p /app/lib/campfire
+      - install -Dm755 bundle/campfire /app/lib/campfire/campfire
+      - cp -r bundle/lib bundle/data /app/lib/campfire/
+      - install -Dm755 campfire.sh /app/bin/campfire
+      - install -Dm644 com.cypherstack.campfire.desktop
+          /app/share/applications/com.cypherstack.campfire.desktop
+      - install -Dm644 com.cypherstack.campfire.metainfo.xml
+          /app/share/metainfo/com.cypherstack.campfire.metainfo.xml
+      - install -Dm644 com.cypherstack.campfire.png
+          /app/share/icons/hicolor/512x512/apps/com.cypherstack.campfire.png
+    sources:
+      - type: dir
+        path: .
diff --git a/flatpak/com.cypherstack.stackduo.desktop b/flatpak/com.cypherstack.stackduo.desktop
new file mode 100644
index 0000000..219c835
--- /dev/null
+++ b/flatpak/com.cypherstack.stackduo.desktop
@@ -0,0 +1,7 @@
+[Desktop Entry]
+Name=Stack Duo
+Comment=An open-source, multicoin wallet for everyone
+Exec=stack_duo
+Icon=com.cypherstack.stackduo
+Type=Application
+Categories=Finance;
diff --git a/flatpak/com.cypherstack.stackduo.metainfo.xml b/flatpak/com.cypherstack.stackduo.metainfo.xml
new file mode 100644
index 0000000..1e929de
--- /dev/null
+++ b/flatpak/com.cypherstack.stackduo.metainfo.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<component type="desktop-application">
+  <id>com.cypherstack.stackduo</id>
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>GPL-3.0-only</project_license>
+  <name>Stack Duo</name>
+  <summary>An open-source, multicoin wallet for everyone</summary>
+  <description>
+    <p>
+      Stack Duo is an open-source, non-custodial cryptocurrency wallet.
+    </p>
+  </description>
+  <url type="homepage">https://stackwallet.com</url>
+  <url type="bugtracker">https://github.com/cypherstack/stack_wallet/issues</url>
+  <content_rating type="oars-1.1"/>
+</component>
diff --git a/flatpak/com.cypherstack.stackduo.yaml b/flatpak/com.cypherstack.stackduo.yaml
new file mode 100644
index 0000000..195f674
--- /dev/null
+++ b/flatpak/com.cypherstack.stackduo.yaml
@@ -0,0 +1,33 @@
+app-id: com.cypherstack.stackduo
+runtime: org.freedesktop.Platform
+runtime-version: '24.08'
+sdk: org.freedesktop.Sdk
+command: stack_duo
+
+finish-args:
+  - --share=network
+  - --share=ipc
+  - --socket=fallback-x11
+  - --socket=wayland
+  - --device=dri
+  - --filesystem=~/.stackduo
+  - --talk-name=org.freedesktop.secrets
+  - --talk-name=org.freedesktop.Notifications
+
+modules:
+  - name: stack_duo
+    buildsystem: simple
+    build-commands:
+      - mkdir -p /app/lib/stack_duo
+      - install -Dm755 bundle/stack_duo /app/lib/stack_duo/stack_duo
+      - cp -r bundle/lib bundle/data /app/lib/stack_duo/
+      - install -Dm755 stack_duo.sh /app/bin/stack_duo
+      - install -Dm644 com.cypherstack.stackduo.desktop
+          /app/share/applications/com.cypherstack.stackduo.desktop
+      - install -Dm644 com.cypherstack.stackduo.metainfo.xml
+          /app/share/metainfo/com.cypherstack.stackduo.metainfo.xml
+      - install -Dm644 com.cypherstack.stackduo.png
+          /app/share/icons/hicolor/512x512/apps/com.cypherstack.stackduo.png
+    sources:
+      - type: dir
+        path: .
diff --git a/flatpak/stack_duo.sh b/flatpak/stack_duo.sh
new file mode 100644
index 0000000..522eab5
--- /dev/null
+++ b/flatpak/stack_duo.sh
@@ -0,0 +1,2 @@
+#!/bin/sh
+exec /app/lib/stack_duo/stack_duo "$@"