diff --git a/frontend/angular.json b/frontend/angular.json
index eaab10211db..3798b3de6ff 100644
--- a/frontend/angular.json
+++ b/frontend/angular.json
@@ -141,6 +141,7 @@
           "options": {
             "tsConfig": "tsconfig.spec.json",
             "buildTarget": "OpenProject:build",
+            "runnerConfig": true,
             "providersFile": "src/test-providers.ts",
             "setupFiles": ["src/test-browser-polyfills.ts", "src/test-setup.ts"],
             "browsers": ["chromium", "firefox", "webkit"],
diff --git a/frontend/src/app/shared/components/autocompleter/op-autocompleter/op-autocompleter.spec.ts b/frontend/src/app/shared/components/autocompleter/op-autocompleter/op-autocompleter.spec.ts
index 162d2974426..e22dd907825 100644
--- a/frontend/src/app/shared/components/autocompleter/op-autocompleter/op-autocompleter.spec.ts
+++ b/frontend/src/app/shared/components/autocompleter/op-autocompleter/op-autocompleter.spec.ts
@@ -81,6 +81,7 @@ describe('autocompleter', () => {
 
   afterEach(() => {
     delete (window as WindowWithOpenProject).OpenProject;
+    vi.restoreAllMocks();
   });
 
   beforeEach(async () => {
@@ -127,9 +128,7 @@ describe('autocompleter', () => {
     it('should load items', () => {
       vi.useFakeTimers();
       try {
-        vi.advanceTimersByTime(0);
         fixture.detectChanges();
-        fixture.componentInstance.ngAfterViewInit();
         vi.advanceTimersByTime(1000);
         fixture.detectChanges();
         const select = fixture.componentInstance.ngSelectInstance;
@@ -182,9 +181,7 @@ describe('autocompleter', () => {
     it('should display formattedId in dropdown options', () => {
       vi.useFakeTimers();
       try {
-        vi.advanceTimersByTime(0);
         fixture.detectChanges();
-        fixture.componentInstance.ngAfterViewInit();
         vi.advanceTimersByTime(1000);
         fixture.detectChanges();
         const select = fixture.componentInstance.ngSelectInstance;
@@ -215,11 +212,10 @@ describe('autocompleter', () => {
     });
 
     it('should display classic formattedId in selected value label', () => {
+      silenceDestroyedOutputWarning();
       vi.useFakeTimers();
       try {
-        vi.advanceTimersByTime(0);
         fixture.detectChanges();
-        fixture.componentInstance.ngAfterViewInit();
         vi.advanceTimersByTime(1000);
         fixture.detectChanges();
         const select = fixture.componentInstance.ngSelectInstance;
@@ -237,8 +233,7 @@ describe('autocompleter', () => {
         fixture.detectChanges();
 
         // Select the first item (classic mode: #1)
-        const firstOption = document.querySelector<HTMLElement>('.ng-option')!;
-        firstOption.click();
+        select.select(select.itemsList.items[0]);
         fixture.detectChanges();
 
         const labelElement = document.querySelector('.ng-value-label');
@@ -253,11 +248,10 @@ describe('autocompleter', () => {
     });
 
     it('should display semantic formattedId in selected value label', () => {
+      silenceDestroyedOutputWarning();
       vi.useFakeTimers();
       try {
-        vi.advanceTimersByTime(0);
         fixture.detectChanges();
-        fixture.componentInstance.ngAfterViewInit();
         vi.advanceTimersByTime(1000);
         fixture.detectChanges();
         const select = fixture.componentInstance.ngSelectInstance;
@@ -275,8 +269,7 @@ describe('autocompleter', () => {
         fixture.detectChanges();
 
         // Select the semantic mode item (PROJ-2)
-        const option = document.querySelector<HTMLElement>('.ng-option')!;
-        option.click();
+        select.select(select.itemsList.items[0]);
         fixture.detectChanges();
 
         const labelElement = document.querySelector('.ng-value-label');
@@ -299,7 +292,6 @@ describe('autocompleter', () => {
 
     it('should load items with debounce', async () => {
       fixture.detectChanges();
-      fixture.componentInstance.ngAfterViewInit();
 
       // Wait for ngAfterViewInit's internal setTimeout(25ms) and debounce to fire.
       await new Promise(resolve => setTimeout(resolve, 100));
@@ -339,6 +331,25 @@ describe('autocompleter', () => {
   });
 });
 
+// NG0953 ("Unexpected emit for destroyed OutputRef") is emitted when ng-select
+// emits on an OutputRef during fixture teardown under fake timers. It is a real
+// lifecycle smell, not pure noise — silencing it here is a pragmatic stopgap so
+// these specs stay readable, not a fix. The proper fix is to stop the
+// emit-after-destroy in the component teardown path; until then this is
+// scoped to the two affected specs and passes every other warning through so it
+// does not hide unrelated regressions. Do not promote this to a global filter.
+function silenceDestroyedOutputWarning():void {
+  const originalWarn = console.warn.bind(console);
+
+  vi.spyOn(console, 'warn').mockImplementation((message?:unknown, ...args:unknown[]) => {
+    if (typeof message === 'string' && message.startsWith('NG0953: Unexpected emit for destroyed `OutputRef`')) {
+      return;
+    }
+
+    originalWarn(message, ...args);
+  });
+}
+
 describe('derived autocompleter', () => {
   beforeEach(async () => {
     await TestBed.configureTestingModule({
diff --git a/frontend/src/app/shared/components/fields/edit/edit-form/edit-form.spec.ts b/frontend/src/app/shared/components/fields/edit/edit-form/edit-form.spec.ts
index e7cf25d086b..dfb8a82781d 100644
--- a/frontend/src/app/shared/components/fields/edit/edit-form/edit-form.spec.ts
+++ b/frontend/src/app/shared/components/fields/edit/edit-form/edit-form.spec.ts
@@ -30,10 +30,11 @@ import { ApplicationRef, Injector } from '@angular/core';
 import { EditForm } from 'core-app/shared/components/fields/edit/edit-form/edit-form';
 import { HalResource } from 'core-app/features/hal/resources/hal-resource';
 import { EditFieldHandler } from 'core-app/shared/components/fields/edit/editing-portal/edit-field-handler';
-import { vi } from 'vitest';
+import { afterEach, vi } from 'vitest';
+import type { IFieldSchema } from 'core-app/shared/components/fields/field.base';
 
 class TestEditForm extends EditForm<HalResource> {
-  constructor(injector:Injector, private readonly requireVisibleSpy:(fieldName:string) => Promise<void>, private readonly activateFieldSpy:() => Promise<EditFieldHandler>, private readonly resetSpy:(fieldName:string, focus?:boolean) => void) {
+  constructor(injector:Injector, private readonly requireVisibleSpy:(fieldName:string) => Promise<void>, private readonly resetSpy:(fieldName:string, focus?:boolean) => void) {
     super(injector);
   }
 
@@ -41,8 +42,10 @@ class TestEditForm extends EditForm<HalResource> {
     return this.requireVisibleSpy(fieldName);
   }
 
-  public activateField():Promise<EditFieldHandler> {
-    return this.activateFieldSpy();
+  // Concrete implementation required by the abstract base. The specs mock
+  // `activate` directly, so this is never invoked.
+  protected activateField(_form:EditForm, _schema:IFieldSchema, _fieldName:string, _errors:string[]):Promise<EditFieldHandler> {
+    return Promise.resolve({} as EditFieldHandler);
   }
 
   public reset(fieldName:string, focus?:boolean):void {
@@ -55,10 +58,13 @@ class TestEditForm extends EditForm<HalResource> {
 }
 
 describe('EditForm', () => {
+  afterEach(() => {
+    vi.restoreAllMocks();
+  });
+
   it('does not require visibility twice for newly erroneous inactive fields', async () => {
     const tick = vi.fn();
     const requireVisible = vi.fn().mockResolvedValue(undefined);
-    const activateField = vi.fn().mockResolvedValue({});
     const reset = vi.fn();
     const injector = {
       get: vi.fn().mockImplementation((token:unknown) => {
@@ -70,7 +76,8 @@ describe('EditForm', () => {
       }),
     };
 
-    const form = new TestEditForm(injector, requireVisible, activateField, reset);
+    const form = new TestEditForm(injector, requireVisible, reset);
+    const activate = vi.spyOn(form, 'activate').mockResolvedValue({} as EditFieldHandler);
     const change = {
       inFlight: false,
       schema: {
@@ -91,13 +98,17 @@ describe('EditForm', () => {
       showEditingBlockedError: vi.fn(),
     } as never;
     form.errorsPerAttribute = { foo: ['Required'] };
+    const consoleErrorSpy = vi.spyOn(console, 'error').mockImplementation(() => undefined);
 
     (form as unknown as {
       setErrorsForFields:(fields:string[]) => void;
     }).setErrorsForFields(['foo']);
-    await Promise.resolve();
-    await Promise.resolve();
+    await vi.waitFor(() => {
+      expect(activate).toHaveBeenCalledTimes(1);
+    });
 
     expect(requireVisible).toHaveBeenCalledTimes(1);
+    expect(activate).toHaveBeenCalledWith('foo', true);
+    expect(consoleErrorSpy).not.toHaveBeenCalled();
   });
 });
diff --git a/frontend/src/app/shared/components/primer/dynamic-icon.directive.spec.ts b/frontend/src/app/shared/components/primer/dynamic-icon.directive.spec.ts
index 776bcc6d2cf..4ad4b42b194 100644
--- a/frontend/src/app/shared/components/primer/dynamic-icon.directive.spec.ts
+++ b/frontend/src/app/shared/components/primer/dynamic-icon.directive.spec.ts
@@ -155,7 +155,7 @@ describe('DynamicIconDirective', () => {
   });
 
   it('should warn when rendering unknown icon', () => {
-    vi.spyOn(console, 'warn');
+    vi.spyOn(console, 'warn').mockImplementation(() => undefined);
 
     component.iconName = 'unknown-icon';
     fixture.detectChanges();
@@ -164,7 +164,7 @@ describe('DynamicIconDirective', () => {
   });
 
   it('should not render anything for unknown icon', () => {
-    vi.spyOn(console, 'warn');
+    vi.spyOn(console, 'warn').mockImplementation(() => undefined);
 
     component.iconName = 'unknown-icon';
     fixture.detectChanges();
@@ -180,7 +180,7 @@ describe('DynamicIconDirective', () => {
   });
 
   it('should handle empty icon name', () => {
-    vi.spyOn(console, 'warn');
+    vi.spyOn(console, 'warn').mockImplementation(() => undefined);
 
     component.iconName = '';
     fixture.detectChanges();
@@ -195,7 +195,7 @@ describe('DynamicIconDirective', () => {
   });
 
   it('should only render once when loaded', () => {
-    vi.spyOn(console, 'warn');
+    vi.spyOn(console, 'warn').mockImplementation(() => undefined);
     const directive = fixture.debugElement.children[0].injector.get(DynamicIconDirective);
     vi.spyOn(directive as any, 'renderIcon');
 
diff --git a/frontend/vitest-base.config.ts b/frontend/vitest-base.config.ts
new file mode 100644
index 00000000000..beea733f225
--- /dev/null
+++ b/frontend/vitest-base.config.ts
@@ -0,0 +1,21 @@
+import { defineConfig } from 'vitest/config';
+
+// Loaded by @angular-builders/custom-esbuild:unit-test via the `runnerConfig`
+// option in angular.json. The builder layers its browser, setup-file and
+// reporter settings on top of this file through an internal plugin, so only
+// runner-level options that the builder does not manage belong here.
+export default defineConfig({
+  test: {
+    // jquery-migrate prints this banner to stdout at import time. It is
+    // expected, carries no signal, and would otherwise appear once per worker.
+    // Filtering here (reporter level) keeps it out of the output without
+    // mutating the global `console`, which is the idiomatic Vitest mechanism.
+    onConsoleLog(log:string):boolean | void {
+      if (log.includes('JQMIGRATE: Migrate is installed')) {
+        return false;
+      }
+
+      return undefined;
+    },
+  },
+});