refactor: restructure to monorepo with apps and packages directories - Move companion app to apps/companion with electron-vite - Move domain/application/infrastructure to packages/ - Fix ELECTRON_RUN_AS_NODE env var issue for VS Code terminal - Remove legacy esbuild bundler (replaced by electron-vite) - Update workspace scripts in root package.json

packages/domain/value-objects/StepId.ts

@@ -0,0 +1,40 @@
+export class StepId {
+  private readonly _value: number;
+
+  private constructor(value: number) {
+    this._value = value;
+  }
+
+  static create(value: number): StepId {
+    if (!Number.isInteger(value)) {
+      throw new Error('StepId must be an integer');
+    }
+    if (value < 1 || value > 18) {
+      throw new Error('StepId must be between 1 and 18');
+    }
+    return new StepId(value);
+  }
+
+  get value(): number {
+    return this._value;
+  }
+
+  equals(other: StepId): boolean {
+    return this._value === other._value;
+  }
+
+  isModalStep(): boolean {
+    return this._value === 6 || this._value === 9 || this._value === 12;
+  }
+
+  isFinalStep(): boolean {
+    return this._value === 18;
+  }
+
+  next(): StepId {
+    if (this.isFinalStep()) {
+      throw new Error('Cannot advance beyond final step');
+    }
+    return StepId.create(this._value + 1);
+  }
+}