feat: add window management, shortcuts, and build fixes

- Add Ctrl+Shift+N shortcut to create new windows
- Implement window state persistence (save/restore position and size)
- New windows duplicate the size of the currently focused window with an offset
- Fix Debian package chrome-sandbox permissions via after-install script
- Update build configuration: remove rpm, add author email

installer.sh

@@ -1,4 +1,66 @@
-#/bin/bash
-wget -O ~/.linear.AppImage https://github.com/kleo-dev/linear-linux/releases/download/v0.2.1/linear-linux-0.2.1.AppImage
-sudo chmod +x ~/.linear.AppImage
-sudo mv ~/.linear.AppImage /bin/linear
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+VERSION="${VERSION:-0.2.1}"
+APPIMAGE_URL="${APPIMAGE_URL:-https://github.com/kleo-dev/linear-linux/releases/download/v${VERSION}/linear-linux-${VERSION}.AppImage}"
+INSTALL_ROOT="${INSTALL_ROOT:-/opt}"
+INSTALL_DIR="${INSTALL_ROOT}/linear-linux-${VERSION}"
+WRAPPER_PATH="/usr/local/bin/linear"
+DESKTOP_PATH="/usr/share/applications/linear.desktop"
+APP_NAME="Linear"
+APP_DIR="${INSTALL_DIR}/squashfs-root"
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+ICON_SVG="${SCRIPT_DIR}/assets/linear-icon.svg"
+ICON_PNG="${SCRIPT_DIR}/assets/linear-app-icon.png"
+
+if [[ ! -f "${ICON_SVG}" || ! -f "${ICON_PNG}" ]]; then
+  echo "Icon assets missing. Expected ${ICON_SVG} and ${ICON_PNG}." >&2
+  exit 1
+fi
+
+tmpdir="$(mktemp -d)"
+trap 'rm -rf "${tmpdir}"' EXIT
+
+echo "Downloading Linear AppImage ${VERSION}..."
+curl -fsSL "${APPIMAGE_URL}" -o "${tmpdir}/linear.AppImage"
+chmod +x "${tmpdir}/linear.AppImage"
+
+echo "Installing to ${INSTALL_DIR}..."
+sudo mkdir -p "${INSTALL_DIR}"
+sudo cp "${tmpdir}/linear.AppImage" "${INSTALL_DIR}/linear.AppImage"
+sudo chmod +x "${INSTALL_DIR}/linear.AppImage"
+sudo bash -lc "cd \"${INSTALL_DIR}\" && ./linear.AppImage --appimage-extract >/dev/null"
+sudo chmod -R a+rX "${APP_DIR}"
+
+echo "Configuring sandbox helper..."
+sudo chown root:root "${APP_DIR}/chrome-sandbox"
+sudo chmod 4755 "${APP_DIR}/chrome-sandbox"
+
+echo "Creating launch wrapper at ${WRAPPER_PATH}..."
+sudo tee "${WRAPPER_PATH}" >/dev/null <<EOF
+#!/usr/bin/env bash
+export CHROME_DEVEL_SANDBOX="${APP_DIR}/chrome-sandbox"
+exec "${APP_DIR}/AppRun" "\$@"
+EOF
+sudo chmod 755 "${WRAPPER_PATH}"
+
+echo "Installing desktop entry..."
+sudo tee "${DESKTOP_PATH}" >/dev/null <<EOF
+[Desktop Entry]
+Type=Application
+Name=${APP_NAME}
+Exec=${WRAPPER_PATH} %U
+Icon=linear
+Terminal=false
+Categories=Utility;
+StartupWMClass=linear-linux
+EOF
+
+echo "Installing icons..."
+sudo install -Dm644 "${ICON_SVG}" /usr/share/icons/hicolor/scalable/apps/linear.svg
+sudo install -Dm644 "${ICON_PNG}" /usr/share/icons/hicolor/512x512/apps/linear.png
+sudo gtk-update-icon-cache -f /usr/share/icons/hicolor || true
+
+echo "Linear ${VERSION} installed. Launch with: ${WRAPPER_PATH}"