feat: add per-provider timeout for usage panel to prevent blocking on slow responses

fix: update scheduler filesystem path from .kb to .fusion for task validation

style: clean up TaskDetailModal styling with reusable CSS classes

test: add comprehensive tests for file-service operations with mocked filesystem

packages/engine/src/restart.integration.test.ts

@@ -77,6 +77,7 @@ function createMockStore(overrides: Record<string, any> = {}) {
     parseFileScopeFromPrompt: vi.fn().mockResolvedValue([]),
     getSettings: vi.fn().mockResolvedValue({ ...DEFAULT_SETTINGS }),
     getRootDir: vi.fn().mockReturnValue("/tmp/root"),
+    getTasksDir: vi.fn().mockReturnValue("/tmp/root/.fusion/tasks"),
     updateStep: vi.fn().mockImplementation(async (id: string, step: number, status: StepStatus) => {
       return makeTaskDetail(id, "in-progress");
     }),