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");
     }),

packages/engine/src/scheduler.test.ts

@@ -49,6 +49,7 @@ function createMockStore(overrides: Partial<TaskStore> = {}): TaskStore {
     parseFileScopeFromPrompt: vi.fn().mockResolvedValue([]),
     logEntry: vi.fn().mockResolvedValue(undefined),
     getRootDir: vi.fn().mockReturnValue("/test/project"),
+    getTasksDir: vi.fn().mockReturnValue("/test/project/.fusion/tasks"),
     on: vi.fn(),
     off: vi.fn(),
     ...overrides,
@@ -276,7 +277,7 @@ describe("Scheduler", () => {
 
       vi.mocked(existsSync).mockImplementation((path) => {
         const value = String(path);
-        return value.includes(".kb/tasks/FN-010") || value.includes("PROMPT.md");
+        return value.includes(".fusion/tasks/FN-010") || value.includes("PROMPT.md");
       });
       vi.mocked(readFile).mockResolvedValue("# Prompt\n" as any);
 
@@ -301,6 +302,7 @@ describe("Scheduler", () => {
         getSettings: vi.fn().mockResolvedValue({ maxConcurrent: 2, maxWorktrees: 4 }),
         updateTask: vi.fn().mockResolvedValue(undefined),
         getRootDir: vi.fn().mockReturnValue("/test/project"),
+        getTasksDir: vi.fn().mockReturnValue("/test/project/.fusion/tasks"),
       });
       
       // Set up mocks directly on the store
@@ -341,6 +343,7 @@ describe("Scheduler", () => {
         getSettings: vi.fn().mockResolvedValue({ maxConcurrent: 2, maxWorktrees: 4 }),
         updateTask: vi.fn().mockResolvedValue(undefined),
         getRootDir: vi.fn().mockReturnValue("/test/project"),
+        getTasksDir: vi.fn().mockReturnValue("/test/project/.fusion/tasks"),
       });
 
       const moveTask = vi.fn().mockResolvedValue(undefined);
@@ -381,6 +384,7 @@ describe("Scheduler", () => {
         getSettings: vi.fn().mockResolvedValue({ maxConcurrent: 2, maxWorktrees: 4 }),
         updateTask: vi.fn().mockResolvedValue(undefined),
         getRootDir: vi.fn().mockReturnValue("/test/project"),
+        getTasksDir: vi.fn().mockReturnValue("/test/project/.fusion/tasks"),
       });
 
       const moveTask = vi.fn().mockResolvedValue(undefined);
@@ -418,6 +422,7 @@ describe("Scheduler", () => {
         getSettings: vi.fn().mockResolvedValue({ maxConcurrent: 2, maxWorktrees: 4 }),
         updateTask: vi.fn().mockResolvedValue(undefined),
         getRootDir: vi.fn().mockReturnValue("/test/project"),
+        getTasksDir: vi.fn().mockReturnValue("/test/project/.fusion/tasks"),
       });
 
       const moveTask = vi.fn().mockResolvedValue(undefined);
@@ -459,6 +464,7 @@ describe("Scheduler", () => {
         getSettings: vi.fn().mockResolvedValue({ maxConcurrent: 2, maxWorktrees: 4 }),
         updateTask: vi.fn().mockResolvedValue(undefined),
         getRootDir: vi.fn().mockReturnValue("/test/project"),
+        getTasksDir: vi.fn().mockReturnValue("/test/project/.fusion/tasks"),
       });
 
       const moveTask = vi.fn().mockResolvedValue(undefined);

packages/engine/src/scheduler.ts

@@ -184,7 +184,7 @@ export class Scheduler {
    * @returns Object with `valid: true` if checks pass, or `valid: false` with a `reason` string if they fail
    */
   private async validateTaskFilesystem(id: string): Promise<{ valid: boolean; reason?: string }> {
-    const taskDir = join(this.store.getRootDir(), ".kb", "tasks", id);
+    const taskDir = join(this.store.getTasksDir(), id);
     
     // Check if task directory exists
     if (!existsSync(taskDir)) {