feat: switch track volume to dB scale with Logic Pro-style fader (−∞dB ~ +12dB)

src/core/project-upgrader/KGProjectUpgrader.ts

@@ -5,6 +5,7 @@ import { upgradeToV3 } from './upgradeToV3';
 import { upgradeToV4 } from './upgradeToV4';
 import { upgradeToV5 } from './upgradeToV5';
 import { upgradeToV6 } from './upgradeToV6';
+import { upgradeToV7 } from './upgradeToV7';
 
 /**
  * Upgrade the given project to the latest structure version, one version at a time.
@@ -48,6 +49,10 @@ export function upgradeProjectToLatest(project: KGProject): KGProject {
         workingProject = upgradeToV6(workingProject);
         break;
       }
+      case 7: {
+        workingProject = upgradeToV7(workingProject);
+        break;
+      }
       default: {
         // If an upgrader is missing, throw to prevent loading incompatible structures
         throw new Error(`No upgrader found for project structure version ${nextVersion}`);