Add AppImage build script

.gitignore

@@ -10,6 +10,12 @@ outlay-gtk/target/
 **/*.rs.bk
 *.pdb
 
+# AppImage build artifacts
+AppDir/
+*.AppImage
+linuxdeploy-*
+linuxdeploy-plugin-*
+
 # IDE
 .idea/
 .vscode/

scripts/build-appimage.sh

@@ -0,0 +1,68 @@
+#!/bin/bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
+
+cd "$PROJECT_DIR"
+
+echo "==> Building release binary..."
+cargo build --release -p outlay-gtk
+
+echo "==> Creating AppDir structure..."
+rm -rf AppDir
+mkdir -p AppDir/usr/bin
+mkdir -p AppDir/usr/share/applications
+mkdir -p AppDir/usr/share/icons/hicolor/scalable/apps
+mkdir -p AppDir/usr/share/glib-2.0/schemas
+mkdir -p AppDir/usr/share/fonts/truetype/liberation
+
+# Copy binary
+cp target/release/outlay-gtk AppDir/usr/bin/
+
+# Copy desktop file
+cp outlay-gtk/data/io.github.outlay.desktop AppDir/
+cp outlay-gtk/data/io.github.outlay.desktop AppDir/usr/share/applications/
+
+# Copy icon
+cp outlay-gtk/data/icons/hicolor/scalable/apps/io.github.outlay.svg AppDir/usr/share/icons/hicolor/scalable/apps/
+
+# Copy GSettings schema
+cp outlay-gtk/data/io.github.outlay.gschema.xml AppDir/usr/share/glib-2.0/schemas/
+glib-compile-schemas AppDir/usr/share/glib-2.0/schemas/
+
+# Bundle Liberation Sans fonts (needed for PDF report generation)
+FONT_DIR="/usr/share/fonts/truetype/liberation"
+if [ -d "$FONT_DIR" ]; then
+    cp "$FONT_DIR"/LiberationSans-*.ttf AppDir/usr/share/fonts/truetype/liberation/
+    echo "==> Bundled Liberation Sans fonts"
+fi
+
+# Download linuxdeploy if not present
+LINUXDEPLOY="linuxdeploy-x86_64.AppImage"
+if [ ! -f "$LINUXDEPLOY" ]; then
+    echo "==> Downloading linuxdeploy..."
+    wget -q "https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/$LINUXDEPLOY"
+    chmod +x "$LINUXDEPLOY"
+fi
+
+# Download GTK plugin if not present
+GTK_PLUGIN="linuxdeploy-plugin-gtk.sh"
+if [ ! -f "$GTK_PLUGIN" ]; then
+    echo "==> Downloading linuxdeploy GTK plugin..."
+    wget -q "https://raw.githubusercontent.com/linuxdeploy/linuxdeploy-plugin-gtk/master/$GTK_PLUGIN"
+    chmod +x "$GTK_PLUGIN"
+fi
+
+echo "==> Building AppImage..."
+export DEPLOY_GTK_VERSION=4
+
+./"$LINUXDEPLOY" \
+    --appdir AppDir \
+    --plugin gtk \
+    --output appimage \
+    --desktop-file AppDir/io.github.outlay.desktop \
+    --icon-file AppDir/usr/share/icons/hicolor/scalable/apps/io.github.outlay.svg
+
+echo "==> Done! AppImage created."
+ls -lh Outlay-*.AppImage 2>/dev/null || echo "Note: Output filename may vary."