feat : update mutilple apply

lib/guides/team-tools.test.ts

@@ -23,6 +23,24 @@ describe("team bulk tools", () => {
     expect(applyTeamFields([source], "source", new Set(["source"]), ["combo"])).toEqual([source]);
   });
 
+  it("copies one field for one character slot only", () => {
+    const source = team("source");
+    const target = team("target");
+    source.members[0] = { ...source.members[0], characterKey: "mavuika", refinement: 1 };
+    target.members[0] = { ...target.members[0], characterKey: "keep-character", refinement: 5 };
+
+    const result = applyTeamFields(
+      [source, target],
+      "source",
+      new Set(["target"]),
+      ["member:0:refinement"],
+    );
+
+    expect(result[1].members[0].refinement).toBe(1);
+    expect(result[1].members[0].characterKey).toBe("keep-character");
+    expect(result[1].members.slice(1)).toEqual(target.members.slice(1));
+  });
+
   it("deduplicates and limits presets", () => {
     const presets = Array.from({ length: 7 }, (_, index) => ({ id: String(index), name: String(index), createdAt: String(index), team: { ...team(String(index)), clientId: undefined as never } }));
     expect(limitPresets([presets[0], presets[0], ...presets.slice(1)])).toHaveLength(5);