diff --git a/apps/ui/src/components/layout/project-switcher/components/project-switcher-item.tsx b/apps/ui/src/components/layout/project-switcher/components/project-switcher-item.tsx
index c1a2fa26..f98e05ac 100644
--- a/apps/ui/src/components/layout/project-switcher/components/project-switcher-item.tsx
+++ b/apps/ui/src/components/layout/project-switcher/components/project-switcher-item.tsx
@@ -1,6 +1,6 @@
 import { Folder, LucideIcon } from 'lucide-react';
 import * as LucideIcons from 'lucide-react';
-import { cn } from '@/lib/utils';
+import { cn, sanitizeForTestId } from '@/lib/utils';
 import { getAuthenticatedImageUrl } from '@/lib/api-fetch';
 import type { Project } from '@/lib/electron';
 
@@ -37,10 +37,15 @@ export function ProjectSwitcherItem({
   const IconComponent = getIconComponent();
   const hasCustomIcon = !!project.customIconPath;
 
+  // Combine project.id with sanitized name for uniqueness and readability
+  // Format: project-switcher-{id}-{sanitizedName}
+  const testId = `project-switcher-${project.id}-${sanitizeForTestId(project.name)}`;
+
   return (
     <button
       onClick={onClick}
       onContextMenu={onContextMenu}
+      data-testid={testId}
       className={cn(
         'group w-full aspect-square rounded-xl flex items-center justify-center relative overflow-hidden',
         'transition-all duration-200 ease-out',
@@ -60,7 +65,6 @@ export function ProjectSwitcherItem({
         'hover:scale-105 active:scale-95'
       )}
       title={project.name}
-      data-testid={`project-switcher-${project.id}`}
     >
       {hasCustomIcon ? (
         <img
diff --git a/apps/ui/src/lib/utils.ts b/apps/ui/src/lib/utils.ts
index 27da4859..933ea1fd 100644
--- a/apps/ui/src/lib/utils.ts
+++ b/apps/ui/src/lib/utils.ts
@@ -125,6 +125,34 @@ export const isMac =
       (/Mac/.test(navigator.userAgent) ||
         (navigator.platform ? navigator.platform.toLowerCase().includes('mac') : false));
 
+/**
+ * Sanitize a string for use in data-testid attributes.
+ * Creates a deterministic, URL-safe identifier from any input string.
+ *
+ * Transformations:
+ * - Convert to lowercase
+ * - Replace spaces with hyphens
+ * - Remove all non-alphanumeric characters (except hyphens)
+ * - Collapse multiple consecutive hyphens into a single hyphen
+ * - Trim leading/trailing hyphens
+ *
+ * @param name - The string to sanitize (e.g., project name, feature title)
+ * @returns A sanitized string safe for CSS selectors and test IDs
+ *
+ * @example
+ * sanitizeForTestId("My Awesome Project!") // "my-awesome-project"
+ * sanitizeForTestId("test-project-123")    // "test-project-123"
+ * sanitizeForTestId("  Foo  Bar  ")        // "foo-bar"
+ */
+export function sanitizeForTestId(name: string): string {
+  return name
+    .toLowerCase()
+    .replace(/\s+/g, '-')
+    .replace(/[^a-z0-9-]/g, '')
+    .replace(/-+/g, '-')
+    .replace(/^-|-$/g, '');
+}
+
 /**
  * Generate a UUID v4 string.
  *
diff --git a/apps/ui/tests/features/feature-manual-review-flow.spec.ts b/apps/ui/tests/features/feature-manual-review-flow.spec.ts
index 42ee7c31..ab8b077d 100644
--- a/apps/ui/tests/features/feature-manual-review-flow.spec.ts
+++ b/apps/ui/tests/features/feature-manual-review-flow.spec.ts
@@ -21,6 +21,7 @@ import {
   getKanbanColumn,
   authenticateForTests,
   handleLoginScreenIfPresent,
+  sanitizeForTestId,
 } from '../utils';
 
 const TEST_TEMP_DIR = createTempDirPath('manual-review-test');
@@ -131,7 +132,9 @@ test.describe('Feature Manual Review Flow', () => {
     }
 
     // Verify we're on the correct project (project switcher button shows project name)
-    await expect(page.getByTestId(`project-switcher-project-${projectName}`)).toBeVisible({
+    // Use ends-with selector since data-testid format is: project-switcher-{id}-{sanitizedName}
+    const sanitizedProjectName = sanitizeForTestId(projectName);
+    await expect(page.locator(`[data-testid$="-${sanitizedProjectName}"]`)).toBeVisible({
       timeout: 10000,
     });
 
diff --git a/apps/ui/tests/projects/new-project-creation.spec.ts b/apps/ui/tests/projects/new-project-creation.spec.ts
index 29e38c3e..4599e8fe 100644
--- a/apps/ui/tests/projects/new-project-creation.spec.ts
+++ b/apps/ui/tests/projects/new-project-creation.spec.ts
@@ -14,6 +14,7 @@ import {
   authenticateForTests,
   handleLoginScreenIfPresent,
   waitForNetworkIdle,
+  sanitizeForTestId,
 } from '../utils';
 
 const TEST_TEMP_DIR = createTempDirPath('project-creation-test');
@@ -77,10 +78,10 @@ test.describe('Project Creation', () => {
     }
 
     // Wait for project to be set as current and visible on the page
-    // The project name appears in the project switcher button with title attribute
-    // (The button uses data-testid with projectId, not projectName)
-    const projectSwitcherButton = page.locator(`button[title="${projectName}"]`).first();
-    await expect(projectSwitcherButton).toBeVisible({
+    // The project name appears in the project switcher button
+    // Use ends-with selector since data-testid format is: project-switcher-{id}-{sanitizedName}
+    const sanitizedProjectName = sanitizeForTestId(projectName);
+    await expect(page.locator(`[data-testid$="-${sanitizedProjectName}"]`)).toBeVisible({
       timeout: 15000,
     });
 
diff --git a/apps/ui/tests/projects/open-existing-project.spec.ts b/apps/ui/tests/projects/open-existing-project.spec.ts
index b89702fb..51772a25 100644
--- a/apps/ui/tests/projects/open-existing-project.spec.ts
+++ b/apps/ui/tests/projects/open-existing-project.spec.ts
@@ -18,6 +18,7 @@ import {
   authenticateForTests,
   handleLoginScreenIfPresent,
   waitForNetworkIdle,
+  sanitizeForTestId,
 } from '../utils';
 
 // Create unique temp dir for this test run
@@ -156,11 +157,11 @@ test.describe('Open Project', () => {
     }
 
     // Wait for a project to be set as current and visible on the page
-    // The project name appears in the project switcher button with title attribute
-    // (The button uses data-testid with projectId, not projectName)
+    // The project name appears in the project switcher button
+    // Use ends-with selector since data-testid format is: project-switcher-{id}-{sanitizedName}
     if (targetProjectName) {
-      const projectSwitcherButton = page.getByRole('button', { name: targetProjectName }).first();
-      await expect(projectSwitcherButton).toBeVisible({
+      const sanitizedName = sanitizeForTestId(targetProjectName);
+      await expect(page.locator(`[data-testid$="-${sanitizedName}"]`)).toBeVisible({
         timeout: 15000,
       });
     }
diff --git a/apps/ui/tests/utils/core/elements.ts b/apps/ui/tests/utils/core/elements.ts
index af6d8df9..b46ad31e 100644
--- a/apps/ui/tests/utils/core/elements.ts
+++ b/apps/ui/tests/utils/core/elements.ts
@@ -1,5 +1,22 @@
 import { Page, Locator } from '@playwright/test';
 
+/**
+ * Sanitize a string for use in data-testid selectors.
+ * This mirrors the sanitizeForTestId function in apps/ui/src/lib/utils.ts
+ * to ensure tests use the same sanitization logic as the component.
+ *
+ * @param name - The string to sanitize (e.g., project name)
+ * @returns A sanitized string safe for CSS selectors
+ */
+export function sanitizeForTestId(name: string): string {
+  return name
+    .toLowerCase()
+    .replace(/\s+/g, '-')
+    .replace(/[^a-z0-9-]/g, '')
+    .replace(/-+/g, '-')
+    .replace(/^-|-$/g, '');
+}
+
 /**
  * Get an element by its data-testid attribute
  */