fix: 3 bug standalone — soundfont preview/play, Carla bridge play item, realtime sync LAN/Tauri

Bug1: dispatcher CREATE_MIDI_ITEM track_id number vs state string -> String(); play+preview native soundfont verified.
Bug2: Carla play item — chờ OSC ready (poll carla-status, queue nốt khi cold start), chống spawn trùng (carla-status dò port bind, open-in-carla skip khi đã chạy).
Bug3: realtime sync — GET /temp/revision (updated_at+client_id), poll 3s, apply qua deserializeProjectFromSchema; hash-skip autosave + client_id chống ping-pong.

app/static/js/services/storage.js

@@ -61,6 +61,21 @@
 
     let autoSaveTimer = null;
     let lastGetProjectStateCallback = null;
+    // ⚠️ FIX (Bug 3): hash-skip — nếu state serialize GIỐNG HỆT bản đã lưu
+    // thì KHÔNG ghi lại (server + localStorage). Chặn ping-pong realtime sync:
+    // client B apply state của A rồi autosave lại → server bump updated_at →
+    // A tưởng mới → apply → ... vô hạn. Bản giống hệt → bỏ qua → hội tụ.
+    let lastSavedJson = '';
+    function getClientId() {
+        try {
+            let c = localStorage.getItem('sonic_client_id');
+            if (!c) {
+                c = 'c_' + Date.now().toString(36) + '_' + Math.random().toString(36).slice(2, 10);
+                localStorage.setItem('sonic_client_id', c);
+            }
+            return c;
+        } catch (e) { return ''; }
+    }
     function scheduleTempAutoSave(getProjectStateCallback) {
         if (getProjectStateCallback) lastGetProjectStateCallback = getProjectStateCallback;
         if (autoSaveTimer) clearTimeout(autoSaveTimer);
@@ -69,9 +84,11 @@
                 const state = lastGetProjectStateCallback ? lastGetProjectStateCallback() : null;
                 if (!state || (!state.tracks && !state.main_session)) return;
                 const dataJson = JSON.stringify(state);
+                if (dataJson === lastSavedJson) return; // không đổi → không ghi
+                lastSavedJson = dataJson;
                 localStorage.setItem('sonic_temp_project', dataJson);
                 if (window.SonicAPI && localStorage.getItem('sonic_token')) {
-                    await window.SonicAPI.saveTempProject(dataJson).catch(() => {});
+                    await window.SonicAPI.saveTempProject(dataJson, getClientId()).catch(() => {});
                 }
             } catch (e) {
                 console.warn("Auto-save temp project warning:", e);
@@ -85,9 +102,11 @@
             const state = lastGetProjectStateCallback ? lastGetProjectStateCallback() : null;
             if (!state || (!state.tracks && !state.main_session)) return;
             const dataJson = JSON.stringify(state);
+            if (dataJson === lastSavedJson) return; // không đổi → không ghi
+            lastSavedJson = dataJson;
             localStorage.setItem('sonic_temp_project', dataJson);
             if (window.SonicAPI && localStorage.getItem('sonic_token')) {
-                await window.SonicAPI.saveTempProject(dataJson).catch(() => {});
+                await window.SonicAPI.saveTempProject(dataJson, getClientId()).catch(() => {});
             }
         } catch (e) {
             console.warn("Flush temp project warning:", e);
@@ -98,6 +117,7 @@
         exportProjectToSFS,
         importProjectFromSFSFile,
         scheduleTempAutoSave,
-        flushTempAutoSave
+        flushTempAutoSave,
+        getClientId
     };
 })();