test(web): eliminate timeout flakiness in the web test suite (closes #1596)

Root-cause and deterministically fix the recurring 5s-timeout flakes that
surfaced under v8-instrumented, concurrent load. All fixes are test-only; no
product source changed. No test was skipped or disabled, and the per-file
coverage gate (>=90 on all four dims) still holds.

Common root cause across the modal/form/screen suites: userEvent.setup()
schedules a real setTimeout between keystrokes. Under CPU contention those
yields balloon, so multi-field interactions blew past the 5s per-test
timeout. Fix: userEvent.setup({ delay: null }) removes the per-keystroke
real-timer dependence (typing dispatches synchronously), making the suites
load-independent.

Per file:
- ServerConfigModal / ServerImportConfigModal / ServerImportJsonModal /
  ResourcesScreen / InspectorView: userEvent.setup({ delay: null }).
- PromptArgumentsForm (completions): replaced wall-clock sleeps sized just
  past the 300ms completion debounce (await setTimeout(400)) — which race
  the debounce timer under load — with awaited conditions (findBy/waitFor)
  on the real rendered outcome, plus delay:null. Negative assertions now
  lean on the component's synchronous state/timer teardown instead of a
  timed window, so they are deterministic regardless of machine speed.
- inspectorClient integration "tracks stderr logs": the child's stderr is
  piped out-of-band from the tool's JSON-RPC response, so reading the log
  synchronously after callTool raced the stderr chunk. Wrapped the assertion
  in vi.waitFor so it polls until the line lands.

Verified: web validate + 6x test:coverage (4 sequential + 2 concurrent
under load) + standalone test:integration, all green (229 files / 3237
tests per coverage run; 799 integration tests), zero intermittent failures.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S3fTN8H3R8YV4yUGvZjYnX

clients/web/src/components/views/InspectorView/InspectorView.test.tsx

@@ -225,7 +225,7 @@ describe("InspectorView", () => {
 
   it("dispatches onToggleConnection with the server id when the card toggle is clicked", async () => {
     const onToggleConnection = vi.fn();
-    const user = userEvent.setup();
+    const user = userEvent.setup({ delay: null });
     renderWithMantine(
       <InspectorView
         {...makeProps({ servers: [sampleServer], onToggleConnection })}
@@ -321,7 +321,7 @@ describe("InspectorView", () => {
         })}
       />,
     );
-    const user = userEvent.setup();
+    const user = userEvent.setup({ delay: null });
     const tabSelect = await screen.findByDisplayValue("Servers");
     await user.click(tabSelect);
     await user.click(await screen.findByText("Tools"));
@@ -514,7 +514,7 @@ describe("InspectorView", () => {
   });
 
   it("filters tools to apps and auto-launches a no-fields app on the Apps tab", async () => {
-    const user = userEvent.setup();
+    const user = userEvent.setup({ delay: null });
     // Plain (non-app) tool plus a tool with a malformed UI resource URI
     // exercise both branches of the appTools filter: the non-app drop and
     // the try/catch around `isAppTool` for malformed metadata.
@@ -630,7 +630,7 @@ describe("InspectorView", () => {
   });
 
   it("snaps activeTab back to Servers when the Apps tab disappears after a refresh", async () => {
-    const user = userEvent.setup();
+    const user = userEvent.setup({ delay: null });
     const { rerender } = renderWithMantine(
       <InspectorView
         {...makeProps({
@@ -818,7 +818,7 @@ describe("InspectorView", () => {
 
   it("dispatches onSetLogLevel through to the Logs screen", async () => {
     const onSetLogLevel = vi.fn();
-    const user = userEvent.setup();
+    const user = userEvent.setup({ delay: null });
     renderWithMantine(
       <InspectorView
         {...makeProps({
@@ -849,7 +849,7 @@ describe("InspectorView", () => {
   });
 
   it("persists Logs sort direction to localStorage and restores it on remount", async () => {
-    const user = userEvent.setup();
+    const user = userEvent.setup({ delay: null });
     const { unmount } = renderWithMantine(
       <InspectorView
         {...makeProps({
@@ -900,7 +900,7 @@ describe("InspectorView", () => {
   });
 
   it("falls back to newest-first when a corrupted sort value is stored", async () => {
-    const user = userEvent.setup();
+    const user = userEvent.setup({ delay: null });
     window.localStorage.setItem("inspector.sortDirection.history", "garbage");
     renderWithMantine(
       <InspectorView
@@ -923,7 +923,7 @@ describe("InspectorView", () => {
   });
 
   it("persists History list compact state to localStorage and restores it on remount", async () => {
-    const user = userEvent.setup();
+    const user = userEvent.setup({ delay: null });
     const historyEntry = {
       id: "req-1",
       timestamp: new Date("2026-03-17T10:00:00Z"),
@@ -981,7 +981,7 @@ describe("InspectorView", () => {
   });
 
   it("falls back to collapsed when a corrupted compact value is stored", async () => {
-    const user = userEvent.setup();
+    const user = userEvent.setup({ delay: null });
     window.localStorage.setItem("inspector.listCompact.history", "garbage");
     const historyEntry = {
       id: "req-1",
@@ -1084,7 +1084,7 @@ describe("InspectorView", () => {
   });
 
   it("toggles the Servers list compact state from the list toggle", async () => {
-    const user = userEvent.setup();
+    const user = userEvent.setup({ delay: null });
     renderWithMantine(
       <InspectorView {...makeProps({ servers: [sampleServer] })} />,
     );
@@ -1098,7 +1098,7 @@ describe("InspectorView", () => {
   });
 
   it("toggles the Network list compact state from the list toggle", async () => {
-    const user = userEvent.setup();
+    const user = userEvent.setup({ delay: null });
     const httpServer: ServerEntry = {
       id: "beta",
       name: "Beta",
@@ -1167,7 +1167,7 @@ describe("InspectorView", () => {
     // The indicator only mounts on the active screen, so each case connects,
     // navigates to the target tab, and asserts the "List updated" affordance.
     async function gotoTab(tab: string) {
-      const user = userEvent.setup();
+      const user = userEvent.setup({ delay: null });
       const tabSelect = await screen.findByDisplayValue("Servers");
       await user.click(tabSelect);
       await user.click(await screen.findByText(tab));