CI: run desktop GUI tests

scripts/run_gui_tests.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+set -eo pipefail
+
+pytest_args=(-vv --desktop -m desktop src/tests)
+if [[ "${RUNNER_OS:-}" == "Windows" ]]; then
+    pytest_args+=(-n 1)
+fi
+
+timeout_bin="timeout"
+if ! command -v "$timeout_bin" >/dev/null 2>&1; then
+    if command -v gtimeout >/dev/null 2>&1; then
+        timeout_bin="gtimeout"
+    else
+        timeout_bin=""
+    fi
+fi
+
+if [[ -n "$timeout_bin" ]]; then
+    $timeout_bin 10m pytest "${pytest_args[@]}" 2>&1 | tee pytest_gui.log
+    status=${PIPESTATUS[0]}
+else
+    echo "timeout command not found; running tests without timeout" >&2
+    pytest "${pytest_args[@]}" 2>&1 | tee pytest_gui.log
+    status=${PIPESTATUS[0]}
+fi
+
+if [[ $status -eq 124 ]]; then
+    echo "::error::Desktop tests exceeded 10-minute limit"
+    tail -n 20 pytest_gui.log
+    exit 1
+fi
+exit $status