test(coverage): bootstrap vitest unit infra and add tests at 90%+ per file (#1245) (#1269)

* test(coverage): bootstrap vitest unit infra and add tests at 90%+ per file (#1245)

Establishes the unit-test runtime AGENTS.md mandates: a vitest "unit"
project alongside the existing storybook project, RTL + jest-dom +
happy-dom, a Mantine-aware render helper, and a 90%-line per-file
coverage gate enforced by CI. Adds 66 test files covering all 62
components under elements/groups/screens/views, plus core/mcp and
clients/web/src/utils. Total: 577 tests, 98.7% line coverage globally.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* test(coverage): address PR #1269 review feedback

- AGENTS.md: correct coverage gate description (lines ≥ 90, statements ≥ 85,
  functions ≥ 80, branches ≥ 50) with rationale for the relaxed branch
  threshold
- InspectorView.test.tsx: document what the Math.random() mock values
  (0.1 / 0.99) control vs. STUB_SUCCESS_RATE in InspectorView.tsx
- vite.config.ts / tsconfig.test.json: drop unused `globals: true` and the
  `vitest/globals` type now that every test file imports describe/it/expect/vi
  explicitly; manual `afterEach(cleanup)` in setup.ts remains required because
  testing-library auto-cleanup relies on globalThis.afterEach

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

clients/web/src/components/groups/HistoryControls/HistoryControls.test.tsx

@@ -0,0 +1,61 @@
+import { describe, it, expect, vi } from "vitest";
+import userEvent from "@testing-library/user-event";
+import type { MessageMethod } from "@inspector/core/mcp/types.js";
+import { renderWithMantine, screen } from "../../../test/renderWithMantine";
+import { HistoryControls } from "./HistoryControls";
+
+const baseProps = {
+  searchText: "",
+  availableMethods: ["tools/list", "prompts/list"] as MessageMethod[],
+  onSearchChange: vi.fn(),
+  onMethodFilterChange: vi.fn(),
+};
+
+describe("HistoryControls", () => {
+  it("renders the title and search input", () => {
+    renderWithMantine(<HistoryControls {...baseProps} />);
+    expect(screen.getByText("History")).toBeInTheDocument();
+    expect(screen.getByPlaceholderText("Search...")).toBeInTheDocument();
+  });
+
+  it("invokes onSearchChange when typing in the search input", async () => {
+    const user = userEvent.setup();
+    const onSearchChange = vi.fn();
+    renderWithMantine(
+      <HistoryControls {...baseProps} onSearchChange={onSearchChange} />,
+    );
+    await user.type(screen.getByPlaceholderText("Search..."), "a");
+    expect(onSearchChange).toHaveBeenCalledWith("a");
+  });
+
+  it("renders the method filter placeholder", () => {
+    renderWithMantine(<HistoryControls {...baseProps} />);
+    expect(screen.getByPlaceholderText("All methods")).toBeInTheDocument();
+  });
+
+  it("displays the active method filter value", () => {
+    renderWithMantine(
+      <HistoryControls {...baseProps} methodFilter="tools/list" />,
+    );
+    const inputs = screen.getAllByDisplayValue("tools/list");
+    expect(inputs.length).toBeGreaterThan(0);
+  });
+
+  it("invokes onMethodFilterChange with undefined when cleared", async () => {
+    const user = userEvent.setup();
+    const onMethodFilterChange = vi.fn();
+    const { container } = renderWithMantine(
+      <HistoryControls
+        {...baseProps}
+        methodFilter="tools/list"
+        onMethodFilterChange={onMethodFilterChange}
+      />,
+    );
+    const clearButton = container.querySelector(
+      "button.mantine-InputClearButton-root",
+    ) as HTMLButtonElement | null;
+    expect(clearButton).not.toBeNull();
+    await user.click(clearButton!);
+    expect(onMethodFilterChange).toHaveBeenCalledWith(undefined);
+  });
+});