refactor(lib): organize modules by feature

lib/form/form-client.test.ts

@@ -0,0 +1,62 @@
+import { describe, expect, test } from "bun:test";
+import {
+  buildFormSchema,
+  parseStoredDraft,
+  prepareInitialState,
+  type Question,
+} from "./form-client";
+
+const questions: Question[] = [
+  {
+    id: "choice",
+    formId: "form",
+    type: "radio",
+    label: "Choice",
+    imageUrl: null,
+    displayOrder: 0,
+    required: true,
+    options: ["A", "B"],
+    allowOther: true,
+    imageAnswerMode: "none",
+  },
+  {
+    id: "tags",
+    formId: "form",
+    type: "checkbox",
+    label: "Tags",
+    imageUrl: null,
+    displayOrder: 1,
+    required: false,
+    options: ["A", "B"],
+    allowOther: true,
+    imageAnswerMode: "none",
+  },
+];
+
+describe("form client domain helpers", () => {
+  test("maps stored custom answers to the Other control", () => {
+    const state = prepareInitialState(questions, {
+      choice: { value: "Custom", imageCdnId: null },
+      tags: { value: JSON.stringify(["A", "Custom tag"]), imageCdnId: null },
+    });
+
+    expect(state.values.choice).toBe("__OTHER__");
+    expect(state.values.tags).toEqual(["A", "__OTHER__"]);
+    expect(state.otherValues).toEqual({ choice: "Custom", tags: "Custom tag" });
+  });
+
+  test("enforces required answers", () => {
+    const schema = buildFormSchema(questions);
+    expect(schema.safeParse({ choice: "", tags: [] }).success).toBe(false);
+    expect(schema.safeParse({ choice: "A", tags: [] }).success).toBe(true);
+  });
+
+  test("parses versioned drafts and rejects malformed JSON", () => {
+    expect(
+      parseStoredDraft(
+        JSON.stringify({ version: 1, answers: { choice: "A" }, otherValues: {} })
+      ).answers.choice
+    ).toBe("A");
+    expect(() => parseStoredDraft("not-json")).toThrow();
+  });
+});