test: add tests for extracted components (Task 5.1)

- LoadingState.test.tsx: default/custom message rendering
- ErrorState.test.tsx: message, retry button, callback
- FileBrowser.test.tsx: loading, entries, error states
- ToolTypesTab.test.tsx: loading, content, error states
- SessionCard.test.tsx: active/recent variants, unnamed fallback
- CreateSessionForm.test.tsx: render, validation, repo loading
- Fix vite.config.ts resolve.alias for @/ path mapping in tests

Quality gates: vitest 17 new tests pass, 70/74 total pass
(pre-existing 4 failures in projects.test.tsx unrelated)
Refs: repo-restructure Task 5.1

apps/web/src/components/features/session/CreateSessionForm.test.tsx

@@ -1,6 +1,8 @@
 import { render, screen, fireEvent, waitFor } from "@testing-library/react";
 import { describe, it, expect, vi } from "vitest";
 import { CreateSessionForm } from "./CreateSessionForm";
+import type { Project } from "@/types/project";
+import type { ToolType } from "@/types/tool-type";
 
 vi.mock("@/api/git_repositories", () => ({
   listRepositories: vi.fn(),
@@ -21,12 +23,12 @@ import { createInstance } from "@/api/sessions";
 const mockProjects = [
   { id: "p1", name: "Project One", description: null, owner_id: "u1", default_ssh_key_id: null },
   { id: "p2", name: "Project Two", description: null, owner_id: "u1", default_ssh_key_id: null },
-];
+] as Project[];
 
 const mockToolTypes = [
-  { id: "t1", name: "vscode", display_name: "VS Code", description: null, category: "editor", interfaces: ["web"] as string[], default_port: 8443, definition_type: "compose" as const, compose_template: "", dockerfile_template: null, readiness_probe: null, required_variables: [], is_builtin: true },
-  { id: "t2", name: "terminal", display_name: "Terminal", description: null, category: "shell", interfaces: ["terminal"] as string[], default_port: 22, definition_type: "dockerfile" as const, compose_template: null, dockerfile_template: "", readiness_probe: null, required_variables: [], is_builtin: true },
-];
+  { id: "t1", name: "vscode", display_name: "VS Code", description: null, category: "editor", interfaces: ["web"], default_port: 8443, definition_type: "compose", compose_template: "", dockerfile_template: null, readiness_probe: null, required_variables: [], is_builtin: true, build_context: null, created_by_id: "u1", created_at: "", updated_at: "" },
+  { id: "t2", name: "terminal", display_name: "Terminal", description: null, category: "shell", interfaces: ["terminal"], default_port: 22, definition_type: "dockerfile", compose_template: null, dockerfile_template: "", readiness_probe: null, required_variables: [], is_builtin: true, build_context: null, created_by_id: "u1", created_at: "", updated_at: "" },
+] as ToolType[];
 
 describe("CreateSessionForm", () => {
   it("renders form with create button", () => {
@@ -51,7 +53,16 @@ describe("CreateSessionForm", () => {
       />
     );
 
-    fireEvent.click(screen.getByText("Create Session"));
+    const { container } = render(
+      <CreateSessionForm
+        projects={mockProjects}
+        toolTypes={mockToolTypes}
+        onCreated={vi.fn()}
+      />
+    );
+
+    const submitBtn = container.querySelector('button[type="submit"]') as HTMLButtonElement;
+    fireEvent.click(submitBtn);
 
     await waitFor(() => {
       expect(

apps/web/src/components/features/session/SessionCard.test.tsx

@@ -32,8 +32,8 @@ describe("SessionCard", () => {
       />
     );
 
-    expect(screen.getByText("Dev Environment")).toBeInTheDocument();
     expect(screen.getByText("running")).toBeInTheDocument();
+    expect(screen.getAllByText("Dev Environment").length).toBeGreaterThanOrEqual(1);
   });
 
   it("renders recent variant with display name", () => {
@@ -50,7 +50,7 @@ describe("SessionCard", () => {
       />
     );
 
-    expect(screen.getByText("Dev Environment")).toBeInTheDocument();
+    expect(screen.getAllByText("Dev Environment").length).toBeGreaterThanOrEqual(1);
   });
 
   it("shows unnamed fallback when display_name is empty", () => {

apps/web/src/components/features/tool-workshop/ToolTypesTab.test.tsx

@@ -3,7 +3,7 @@ import { describe, it, expect, vi } from "vitest";
 import { ToolTypesTab } from "./ToolTypesTab";
 
 vi.mock("../../../api/tool_types", () => ({
-  listToolTypes: vi.fn(),
+  listToolTypes: vi.fn(() => Promise.resolve([])),
   createToolType: vi.fn(),
   deleteToolType: vi.fn(),
   updateToolType: vi.fn(),