fix: correct mock mode configuration in browser capability test

The test was using an incorrect group format { id: 'browser' } instead of
the correct string format 'browser'. Also updated the mock API path to
match other tests in the same directory and changed label to name to
match the ModeConfig interface.

Author: hannesrudolph

src/core/webview/__tests__/generateSystemPrompt.browser-capability.spec.ts

@@ -12,7 +12,7 @@ vi.mock("../../prompts/system", () => ({
 }))
 
 // Mock API handler so we control model.info flags
-vi.mock("../../api", () => ({
+vi.mock("../../../api", () => ({
 	buildApiHandler: vi.fn((_config) => ({
 		getModel: () => ({
 			id: "mock-model",
@@ -33,9 +33,10 @@ vi.mock("../../api", () => ({
 const mockCustomModes = [
 	{
 		slug: "test-mode",
-		label: "Test Mode",
+		name: "Test Mode",
+		roleDefinition: "Test role",
 		description: "",
-		groups: [{ id: "browser" }], // critical: include browser group
+		groups: ["browser"], // critical: include browser group
 	},
 ]