refactor(routes): move shared pages to global scope

src/router/__tests__/global-route-context.test.ts

@@ -0,0 +1,59 @@
+import { describe, expect, it } from "vitest";
+
+import {
+  buildGlobalPageUrl,
+  resolveGlobalRouteContext,
+  resolveGlobalRouteContextValue,
+} from "../global-route-context";
+import { ROUTES } from "../routes";
+
+describe("global route context", () => {
+  it("preserves a known character chat as the return target", () => {
+    const context = resolveGlobalRouteContext("/characters/maya/chat");
+
+    expect(context).toMatchObject({
+      characterSlug: "maya",
+      chatUrl: "/characters/maya/chat",
+      splashUrl: "/characters/maya/splash",
+    });
+    expect(context.sidebarUrl).toBe(
+      "/sidebar?returnTo=%2Fcharacters%2Fmaya%2Fchat",
+    );
+    expect(context.feedbackUrl).toBe(
+      "/feedback?returnTo=%2Fcharacters%2Fmaya%2Fchat",
+    );
+    expect(context.coinsRulesUrl).toBe(
+      "/coins-rules?returnTo=%2Fcharacters%2Fmaya%2Fchat",
+    );
+  });
+
+  it("uses only the first repeated return target", () => {
+    expect(
+      resolveGlobalRouteContextValue([
+        "/characters/nayeli/chat",
+        "/characters/maya/chat",
+      ]),
+    ).toBe("/characters/nayeli/chat");
+  });
+
+  it.each([
+    undefined,
+    null,
+    "",
+    "https://example.com/characters/maya/chat",
+    "//example.com/characters/maya/chat",
+    "/characters/unknown/chat",
+    "/characters/maya/private-room",
+    "/characters/maya/chat?image=1",
+  ])("falls back to Elio for an invalid return target", (value) => {
+    expect(resolveGlobalRouteContextValue(value)).toBe(
+      "/characters/elio/chat",
+    );
+  });
+
+  it("sanitizes return targets when building a global page url", () => {
+    expect(buildGlobalPageUrl(ROUTES.sidebar, "https://example.com")).toBe(
+      "/sidebar?returnTo=%2Fcharacters%2Felio%2Fchat",
+    );
+  });
+});