player, song generation again, home and design fixes

functions/src/music.js

@@ -18,6 +18,8 @@ const {
   SUNO_STATUS_PATH,
 } = require("../config/suno");
 
+const MAX_STORED_MUSIC_TRACKS = 4;
+
 /**
  * Marque un projet comme échoué suite à une erreur Suno
  * @param {string} projectId - Identifiant du projet
@@ -673,8 +675,39 @@ exports.sunoCallback = onRequest({ methods: ["POST"] }, async (req, res) => {
 
     // 4) Mettre à jour le statut du projet
     try {
-      const musicUrls = [p1?.url, p2?.url].filter(Boolean);
-      await refList.projects.doc(projectId).set(
+      const newMusicUrls = [p1?.url, p2?.url]
+        .filter((url) => typeof url === "string" && url.trim())
+        .map((url) => url.trim());
+
+      const projectRef = refList.projects.doc(projectId);
+      let existingMusicUrls = [];
+      try {
+        const projectSnap = await projectRef.get();
+        const projectData = projectSnap?.data() || {};
+        if (Array.isArray(projectData.musicUrls)) {
+          existingMusicUrls = projectData.musicUrls
+            .filter((url) => typeof url === "string" && url.trim())
+            .map((url) => url.trim());
+        }
+      } catch (readError) {
+        console.error(
+          "⚠️ [SunoCallback] Impossible de récupérer les anciennes musiques:",
+          readError,
+        );
+      }
+
+      const mergedMusicUrls = [...existingMusicUrls, ...newMusicUrls];
+      const uniqueMusicUrls = mergedMusicUrls.filter(
+        (url, index) => mergedMusicUrls.indexOf(url) === index,
+      );
+      const musicUrls =
+        uniqueMusicUrls.length > MAX_STORED_MUSIC_TRACKS
+          ? uniqueMusicUrls.slice(
+              uniqueMusicUrls.length - MAX_STORED_MUSIC_TRACKS,
+            )
+          : uniqueMusicUrls;
+
+      await projectRef.set(
         {
           musicStatus: "GENERATED",
           musicUrls,