Implement the 021-bestiary-statblock feature that adds a searchable D&D 2024 Monster Manual creature library with inline autocomplete suggestions, full stat block display in a fixed side panel, auto-numbering of duplicate creature names, HP/AC pre-fill from bestiary data, and automatic stat block display on turn change for wide viewports

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/domain/src/__tests__/auto-number.test.ts

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+import { describe, expect, it } from "vitest";
+import { resolveCreatureName } from "../auto-number.js";
+
+describe("resolveCreatureName", () => {
+	it("returns name as-is when no conflict exists", () => {
+		const result = resolveCreatureName("Goblin", ["Orc", "Dragon"]);
+		expect(result).toEqual({ newName: "Goblin", renames: [] });
+	});
+
+	it("returns name as-is when existing list is empty", () => {
+		const result = resolveCreatureName("Goblin", []);
+		expect(result).toEqual({ newName: "Goblin", renames: [] });
+	});
+
+	it("renames existing to 'Name 1' and new to 'Name 2' on first conflict", () => {
+		const result = resolveCreatureName("Goblin", ["Orc", "Goblin", "Dragon"]);
+		expect(result).toEqual({
+			newName: "Goblin 2",
+			renames: [{ from: "Goblin", to: "Goblin 1" }],
+		});
+	});
+
+	it("appends next number when numbered variants already exist", () => {
+		const result = resolveCreatureName("Goblin", ["Goblin 1", "Goblin 2"]);
+		expect(result).toEqual({ newName: "Goblin 3", renames: [] });
+	});
+
+	it("handles mixed exact and numbered matches", () => {
+		const result = resolveCreatureName("Goblin", [
+			"Goblin",
+			"Goblin 1",
+			"Goblin 2",
+		]);
+		expect(result).toEqual({ newName: "Goblin 3", renames: [] });
+	});
+
+	it("handles names with special regex characters", () => {
+		const result = resolveCreatureName("Goblin (Boss)", ["Goblin (Boss)"]);
+		expect(result).toEqual({
+			newName: "Goblin (Boss) 2",
+			renames: [{ from: "Goblin (Boss)", to: "Goblin (Boss) 1" }],
+		});
+	});
+
+	it("does not match partial name overlaps", () => {
+		const result = resolveCreatureName("Goblin", ["Goblin Boss"]);
+		expect(result).toEqual({ newName: "Goblin", renames: [] });
+	});
+});