Add private Home Assistant credentials settings

tests/quickshell/HomeAssistantConfigHarness.qml

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+import Quickshell
+import Quickshell.Io
+import QtQuick
+
+import qs.services
+
+ShellRoot {
+    Component.onCompleted: HomeAssistant.fixtureMode = true
+
+    IpcHandler {
+        target: "home-assistant-config-test"
+
+        function save(url: string, entities: string): bool {
+            return HomeAssistantConfig.save(url, entities, "");
+        }
+
+        function clearToken(): bool {
+            return HomeAssistantConfig.clearToken();
+        }
+
+        function refresh(): void {
+            HomeAssistantConfig.refresh();
+        }
+
+        function status(): string {
+            return JSON.stringify({
+                url: HomeAssistantConfig.url,
+                entities: HomeAssistantConfig.entities,
+                tokenConfigured: HomeAssistantConfig.tokenConfigured,
+                configured: HomeAssistantConfig.configured,
+                busy: HomeAssistantConfig.busy,
+                lastError: HomeAssistantConfig.lastError,
+                pendingPayloadEmpty: HomeAssistantConfig.pendingPayload === ""
+            });
+        }
+    }
+}