Add cross-platform packaging and CI

- macOS .app bundle script (osx-arm64, Info.plist)
- Linux AppImage script (linux-x64, .desktop file)
- GitHub Actions CI: build/test/publish for all 3 platforms

.github/workflows/build-avalonia.yml

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+name: Build PKHeX Avalonia
+
+on:
+  push:
+    branches: [ avalonia-cross-platform ]
+  pull_request:
+    branches: [ avalonia-cross-platform ]
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        include:
+          - os: ubuntu-latest
+            rid: linux-x64
+          - os: macos-latest
+            rid: osx-arm64
+          - os: windows-latest
+            rid: win-x64
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Setup .NET
+      uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: '10.0.x'
+        dotnet-quality: 'preview'
+
+    - name: Restore
+      run: dotnet restore PKHeX.Avalonia/PKHeX.Avalonia.csproj
+
+    - name: Build
+      run: dotnet build PKHeX.Avalonia/PKHeX.Avalonia.csproj --no-restore -c Release
+
+    - name: Test
+      run: dotnet test Tests/PKHeX.Core.Tests/PKHeX.Core.Tests.csproj --no-restore
+
+    - name: Publish
+      run: dotnet publish PKHeX.Avalonia/PKHeX.Avalonia.csproj -c Release -r ${{ matrix.rid }} --self-contained -o publish/${{ matrix.rid }}
+
+    - name: Upload artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: PKHeX-${{ matrix.rid }}
+        path: publish/${{ matrix.rid }}/

PKHeX.Avalonia/publish/linux/create-appimage.sh

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+#!/bin/bash
+APP_NAME="PKHeX"
+PUBLISH_DIR="bin/publish/linux-x64"
+
+dotnet publish ../PKHeX.Avalonia.csproj -c Release -r linux-x64 --self-contained -o "$PUBLISH_DIR"
+
+# Create AppDir structure
+APP_DIR="${APP_NAME}.AppDir"
+mkdir -p "${APP_DIR}/usr/bin"
+mkdir -p "${APP_DIR}/usr/share/icons/hicolor/256x256/apps"
+cp -R "${PUBLISH_DIR}/"* "${APP_DIR}/usr/bin/"
+cp pkhex.desktop "${APP_DIR}/"
+# cp pkhex.png "${APP_DIR}/usr/share/icons/hicolor/256x256/apps/"
+
+cat > "${APP_DIR}/AppRun" << 'APPRUN'
+#!/bin/bash
+HERE=$(dirname "$(readlink -f "$0")")
+exec "$HERE/usr/bin/PKHeX.Avalonia" "$@"
+APPRUN
+chmod +x "${APP_DIR}/AppRun"
+
+echo "Created ${APP_DIR} - use appimagetool to create .AppImage"

PKHeX.Avalonia/publish/linux/pkhex.desktop

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+[Desktop Entry]
+Name=PKHeX
+Comment=Pokemon Save Editor
+Exec=PKHeX.Avalonia
+Icon=pkhex
+Type=Application
+Categories=Utility;Game;

PKHeX.Avalonia/publish/macos/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>CFBundleName</key>
+    <string>PKHeX</string>
+    <key>CFBundleDisplayName</key>
+    <string>PKHeX - Pokemon Save Editor</string>
+    <key>CFBundleIdentifier</key>
+    <string>com.pkhex.avalonia</string>
+    <key>CFBundleVersion</key>
+    <string>1.0.0</string>
+    <key>CFBundleShortVersionString</key>
+    <string>1.0.0</string>
+    <key>CFBundlePackageType</key>
+    <string>APPL</string>
+    <key>CFBundleExecutable</key>
+    <string>PKHeX.Avalonia</string>
+    <key>NSHighResolutionCapable</key>
+    <true/>
+    <key>LSMinimumSystemVersion</key>
+    <string>11.0</string>
+    <key>CFBundleDocumentTypes</key>
+    <array>
+        <dict>
+            <key>CFBundleTypeRole</key>
+            <string>Editor</string>
+            <key>LSHandlerRank</key>
+            <string>Default</string>
+            <key>LSItemContentTypes</key>
+            <array>
+                <string>public.data</string>
+            </array>
+        </dict>
+    </array>
+</dict>
+</plist>

PKHeX.Avalonia/publish/macos/create-app-bundle.sh

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+#!/bin/bash
+# Creates a macOS .app bundle for PKHeX Avalonia
+APP_NAME="PKHeX"
+PUBLISH_DIR="bin/publish/osx-arm64"
+APP_DIR="${APP_NAME}.app"
+
+# Build
+dotnet publish ../PKHeX.Avalonia.csproj -c Release -r osx-arm64 --self-contained -o "$PUBLISH_DIR"
+
+# Create .app structure
+mkdir -p "${APP_DIR}/Contents/MacOS"
+mkdir -p "${APP_DIR}/Contents/Resources"
+cp -R "${PUBLISH_DIR}/"* "${APP_DIR}/Contents/MacOS/"
+cp Info.plist "${APP_DIR}/Contents/"
+# cp icon.icns "${APP_DIR}/Contents/Resources/" # Add icon later
+
+echo "Created ${APP_DIR}"