docs: make targets and counts for the guard

desktop-test runs the 39 desktop tests in the backend venv (an absolute
path, so pytest does not warn about sys.prefix); the root README explains
that a '*' in the expansion list means every subdomain, and that the desktop
app answers the zones a hosts file cannot express.

Makefile

@@ -30,6 +30,9 @@ web-build: ## Build the web UI into frontend/dist
 desktop: ## Run the native desktop app against localhost:8000
 	cd desktop && python3 -m kadence_desktop
 
+desktop-test: ## Run the desktop app test suite (uses the backend venv)
+	cd desktop && $(CURDIR)/backend/.venv/bin/python -m pytest -q
+
 desktop-install: ## Install the launcher entry and icon for your user
 	./desktop/packaging/install-desktop.sh
 
@@ -61,4 +64,4 @@ deploy: ## Push master and redeploy kadence.timka.su on sw_pl_1
 deploy-logs: ## Follow the production app log
 	ssh sw_pl_1 'cd /opt/kadence && docker compose -f docker-compose.yml -f docker-compose.prod.yml logs -f --tail 100 app'
 
-.PHONY: help up down logs dev test backend-venv web-build desktop desktop-install helper-install android-test android-test-core android-build android-install report set-password deploy deploy-logs
+.PHONY: help up down logs dev test backend-venv web-build desktop desktop-test desktop-install helper-install android-test android-test-core android-build android-install report set-password deploy deploy-logs