feat(packaging): add AppImage build script, AppDir metadata, and systemd service unit

packaging/appimage/AppRun

@@ -0,0 +1,19 @@
+#!/bin/sh
+set -e
+HERE="$(dirname "$(readlink -f "$0")")"
+export PATH="$HERE/usr/bin:$PATH"
+export XDG_DATA_DIRS="$HERE/usr/share:${XDG_DATA_DIRS:-/usr/local/share:/usr/share}"
+
+case "$1" in
+    daemon)
+        shift
+        exec "$HERE/usr/bin/blocker-daemon" "$@"
+        ;;
+    ui)
+        shift
+        exec "$HERE/usr/bin/blocker-ui" "$@"
+        ;;
+    *)
+        exec "$HERE/usr/bin/blocker-daemon" "$@"
+        ;;
+esac

packaging/appimage/blocker.desktop

@@ -0,0 +1,8 @@
+[Desktop Entry]
+Name=Blocker
+Comment=Focus and app blocking daemon
+Exec=AppRun
+Icon=blocker
+Type=Application
+Categories=Utility;
+Terminal=true

packaging/appimage/blocker.svg

@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64" width="64" height="64">
+  <circle cx="32" cy="32" r="30" fill="#2d3748" stroke="#4a5568" stroke-width="2"/>
+  <circle cx="32" cy="32" r="22" fill="none" stroke="#e53e3e" stroke-width="4"/>
+  <line x1="16" y1="16" x2="48" y2="48" stroke="#e53e3e" stroke-width="4"/>
+</svg>

packaging/systemd/blocker.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Blocker Focus Daemon
+PartOf=graphical-session.target
+After=graphical-session.target
+
+[Service]
+Type=simple
+ExecStart=%h/.local/bin/blocker-daemon
+Restart=always
+RestartSec=3
+
+[Install]
+WantedBy=graphical-session.target

scripts/build-appimage.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+# Build an AppImage packaging blocker-daemon, blocker-ui and assets.
+
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+DIST_DIR="$ROOT_DIR/dist"
+APPDIR="$DIST_DIR/AppDir"
+PKG_DIR="$ROOT_DIR/packaging/appimage"
+
+echo "Building release binaries..."
+cargo build --release -p blocker-daemon -p blocker-ui
+
+echo "Preparing AppDir structure..."
+mkdir -p "$APPDIR"
+mkdir -p "$APPDIR/usr/bin"
+mkdir -p "$APPDIR/usr/share/applications"
+mkdir -p "$APPDIR/usr/share/icons/hicolor/scalable/apps"
+
+cp "$ROOT_DIR/target/release/blocker-daemon" "$APPDIR/usr/bin/"
+cp "$ROOT_DIR/target/release/blocker-ui" "$APPDIR/usr/bin/"
+cp "$PKG_DIR/AppRun" "$APPDIR/AppRun"
+cp "$PKG_DIR/blocker.desktop" "$APPDIR/blocker.desktop"
+cp "$PKG_DIR/blocker.desktop" "$APPDIR/usr/share/applications/"
+cp "$PKG_DIR/blocker.svg" "$APPDIR/blocker.svg"
+cp "$PKG_DIR/blocker.svg" "$APPDIR/usr/share/icons/hicolor/scalable/apps/"
+chmod +x "$APPDIR/AppRun"
+
+OUTPUT_APPIMAGE="$DIST_DIR/Blocker-x86_64.AppImage"
+rm -f "$OUTPUT_APPIMAGE"
+
+echo "Creating AppImage with mksquashfs..."
+mksquashfs "$APPDIR" "$OUTPUT_APPIMAGE" -root-owned -noappend -comp xz
+
+echo "Built AppImage: $OUTPUT_APPIMAGE"
+ls -lh "$OUTPUT_APPIMAGE"