Close test-gap noise rows and sync coverage documentation.

Restore P1/P2/fleet/erasure COVERED rows in PROBLEMS.md with refreshed counts; drop fixed poll-duplication and Vitest-noise items. Silence ECONNREFUSED stderr in Vitest setup, alias download mock exports, and expand erasure/Path Tracer test coverage.

server/web/src/test/setup.ts

@@ -1,9 +1,28 @@
-import { vi, beforeEach } from 'vitest';
+import { vi, beforeEach, afterEach } from 'vitest';
 
 import '@testing-library/jest-dom/vitest';
 
+const nativeConsoleError = console.error.bind(console);
+
+/** Builder/dashboard happy-dom tests stub fetch failures; silence noisy ECONNREFUSED stderr. */
+function isBenignTestStderr(args: unknown[]): boolean {
+  const text = args.map((a) => (a instanceof Error ? a.message : String(a))).join(' ');
+  return text.includes('ECONNREFUSED');
+}
+
+let consoleErrorSpy: ReturnType<typeof vi.spyOn> | undefined;
+
 beforeEach(() => {
   if (typeof Element !== 'undefined') {
     Element.prototype.scrollIntoView = vi.fn();
   }
+  consoleErrorSpy = vi.spyOn(console, 'error').mockImplementation((...args: unknown[]) => {
+    if (isBenignTestStderr(args)) return;
+    nativeConsoleError(...args);
+  });
+});
+
+afterEach(() => {
+  consoleErrorSpy?.mockRestore();
+  consoleErrorSpy = undefined;
 });