fix(web): remove circular 'Edit settings' link from DegradedProjectState

The 'Edit settings' link pointed to /projects/{id}/settings, which also
renders DegradedProjectState — making the button a self-link on the
settings page. Remove it entirely; 'Back to dashboard' (/) is the only
escape hatch needed.

Add DegradedProjectState component tests and assert both pages show no
'Edit settings' link and that 'Back to dashboard' points to /.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/web/src/app/projects/[projectId]/page.test.tsx

@@ -53,5 +53,7 @@ describe("ProjectPage", () => {
     expect(screen.getByText("This project's config failed to load")).toBeInTheDocument();
     expect(screen.getByText("Local config failed validation")).toBeInTheDocument();
     expect(screen.queryByTestId("dashboard")).not.toBeInTheDocument();
+    expect(screen.getByRole("link", { name: "Back to dashboard" })).toHaveAttribute("href", "/");
+    expect(screen.queryByRole("link", { name: "Edit settings" })).not.toBeInTheDocument();
   });
 });

packages/web/src/app/projects/[projectId]/settings/page.test.tsx

@@ -77,5 +77,7 @@ describe("ProjectSettingsPage", () => {
     ).toBeInTheDocument();
     expect(screen.getByText("Local config failed validation")).toBeInTheDocument();
     expect(screen.queryByRole("button", { name: "Save changes" })).not.toBeInTheDocument();
+    expect(screen.getByRole("link", { name: "Back to dashboard" })).toHaveAttribute("href", "/");
+    expect(screen.queryByRole("link", { name: "Edit settings" })).not.toBeInTheDocument();
   });
 });

packages/web/src/components/DegradedProjectState.tsx

@@ -66,12 +66,6 @@ export function DegradedProjectState({
           >
             Back to dashboard
           </Link>
-          <Link
-            href={`/projects/${encodeURIComponent(projectId)}/settings`}
-            className="rounded-lg border border-[var(--color-border-default)] px-4 py-2 text-sm font-medium text-[var(--color-text-secondary)] transition-colors hover:bg-[var(--color-bg-elevated-hover)]"
-          >
-            Edit settings
-          </Link>
         </div>
       </div>
     </div>

packages/web/src/components/__tests__/DegradedProjectState.test.tsx

@@ -0,0 +1,86 @@
+import { render, screen } from "@testing-library/react";
+import { describe, expect, it, vi } from "vitest";
+import { DegradedProjectState } from "@/components/DegradedProjectState";
+
+vi.mock("next/link", () => ({
+  default: ({
+    children,
+    ...props
+  }: React.PropsWithChildren<React.AnchorHTMLAttributes<HTMLAnchorElement>>) => (
+    <a {...props}>{children}</a>
+  ),
+}));
+
+vi.mock("@/components/RepairDegradedProjectButton", () => ({
+  RepairDegradedProjectButton: ({ projectId }: { projectId: string }) => (
+    <button>Repair {projectId}</button>
+  ),
+}));
+
+const baseProps = {
+  projectId: "my-project",
+  resolveError: "Local config at /tmp/my-project/agent-orchestrator.yaml failed validation: bad field",
+  projectPath: "/tmp/my-project",
+};
+
+describe("DegradedProjectState", () => {
+  it("renders the default heading", () => {
+    render(<DegradedProjectState {...baseProps} />);
+    expect(screen.getByText("This project's config failed to load")).toBeInTheDocument();
+  });
+
+  it("renders a custom heading when provided", () => {
+    render(<DegradedProjectState {...baseProps} heading="Custom heading" />);
+    expect(screen.getByText("Custom heading")).toBeInTheDocument();
+  });
+
+  it("displays the resolve error", () => {
+    render(<DegradedProjectState {...baseProps} />);
+    expect(screen.getByText(baseProps.resolveError)).toBeInTheDocument();
+  });
+
+  it("extracts and displays the config path from the resolve error", () => {
+    render(<DegradedProjectState {...baseProps} />);
+    expect(
+      screen.getByText("/tmp/my-project/agent-orchestrator.yaml"),
+    ).toBeInTheDocument();
+  });
+
+  it("falls back to the project path when the config path cannot be parsed from the error", () => {
+    render(
+      <DegradedProjectState
+        {...baseProps}
+        resolveError="Something went wrong"
+      />,
+    );
+    expect(
+      screen.getByText("/tmp/my-project/agent-orchestrator.yaml or .yml"),
+    ).toBeInTheDocument();
+  });
+
+  it("renders 'Back to dashboard' link pointing to /", () => {
+    render(<DegradedProjectState {...baseProps} />);
+    const link = screen.getByRole("link", { name: "Back to dashboard" });
+    expect(link).toHaveAttribute("href", "/");
+  });
+
+  it("does not render an 'Edit settings' link", () => {
+    render(<DegradedProjectState {...baseProps} />);
+    expect(screen.queryByRole("link", { name: "Edit settings" })).not.toBeInTheDocument();
+  });
+
+  it("does not show the repair button for a generic validation error", () => {
+    render(<DegradedProjectState {...baseProps} />);
+    expect(screen.queryByRole("button", { name: /repair/i })).not.toBeInTheDocument();
+  });
+
+  it("shows the repair button when the error indicates a wrapped projects format", () => {
+    render(
+      <DegradedProjectState
+        {...baseProps}
+        resolveError="Local config at /tmp/x/agent-orchestrator.yaml still uses a wrapped projects: format"
+      />,
+    );
+    expect(screen.getByRole("button", { name: /repair/i })).toBeInTheDocument();
+  });
+});