fix empty project creation and use credit to generate

src/screens/Home/Home.js

@@ -31,16 +31,26 @@ import {
   getStageAction,
 } from "../../utils/projectStages";
 
+const isProjectEmpty = (project) => {
+  if (!project) {
+    return false;
+  }
+
+  return !(
+    typeof project?.title === "string" && project.title.trim().length > 0
+  );
+};
+
 const Home = ({ navigation, route }) => {
   const isFocused = useIsFocused();
   const {
     userProjects = [],
-    resetSelectedProject,
     selectProject,
     selectedProject,
     selectedProjectId,
     currentUserData,
     currentUID,
+    createNewProject,
   } = useUser();
   const { setTooltip } = useMinuit();
 
@@ -310,18 +320,42 @@ const Home = ({ navigation, route }) => {
     []
   );
 
-  const handleStartNew = useCallback(() => {
-    resetSelectedProject();
-    setActiveStageIndex(0);
-    if (songwriterAction?.route) {
-      console.log(
-        "navigating to",
-        songwriterAction.route,
-        songwriterAction.params
-      );
-      navigate(songwriterAction.route, songwriterAction.params);
+  const handleStartNew = useCallback(async () => {
+    const targetRoute = songwriterAction?.route || Routes.WritingLyrics;
+    const targetParams = songwriterAction?.params;
+
+    try {
+      const emptyProject =
+        projects.find((project) => isProjectEmpty(project)) || null;
+
+      if (emptyProject?.id) {
+        selectProject(emptyProject.id);
+        setActiveStageIndex(findFirstUnlockedStageIndex(emptyProject));
+        navigate(targetRoute, targetParams);
+        return;
+      }
+
+      const newProjectId = await createNewProject({ hasLyrics: false });
+      if (!newProjectId) {
+        return;
+      }
+      setActiveStageIndex(0);
+      navigate(targetRoute, targetParams);
+    } catch (error) {
+      console.warn("Home: unable to start new project", error);
+      setTooltip?.({
+        type: "error",
+        text: "Impossible de démarrer un nouveau projet",
+      });
     }
-  }, [resetSelectedProject, songwriterAction]);
+  }, [
+    createNewProject,
+    projects,
+    selectProject,
+    setActiveStageIndex,
+    setTooltip,
+    songwriterAction,
+  ]);
 
   const continueDisabled = !hasActiveProject || stageLocked || !stageRoute;
   const startDisabled = !songwriterAction?.route;