diff --git a/app/components/navbar.responsive-breakpoints.test.tsx b/app/components/navbar.responsive-breakpoints.test.tsx
index b347e3531..eceb6568b 100644
--- a/app/components/navbar.responsive-breakpoints.test.tsx
+++ b/app/components/navbar.responsive-breakpoints.test.tsx
@@ -142,14 +142,14 @@ describe('Navbar Responsive Breakpoints & Menu Toggle', () => {
     expect(screen.getByRole('button', { name: 'Open menu' })).toBeDefined();
   });
 
-  it('4. Hides the desktop nav row on mobile and only reveals mobile hamburger controls, via complementary md: classes', () => {
+  it('4. Hides the desktop nav row on mobile and only reveals mobile hamburger controls, via complementary lg: classes', () => {
     const { container } = render(<Navbar />);
 
-    const desktopNavRow = container.querySelector('.hidden.items-center.gap-2.md\\:flex');
+    const desktopNavRow = container.querySelector('.hidden.items-center.gap-2.lg\\:flex');
     expect(desktopNavRow).toBeInTheDocument();
 
     const mobileControls = container.querySelector(
-      '.md\\:hidden.inline-flex.items-center.justify-center.gap-1'
+      '.lg\\:hidden.inline-flex.items-center.justify-center.gap-1'
     );
     expect(mobileControls).toBeInTheDocument();
   });
diff --git a/app/contributors/ContributorsSearch.type-compiler.test.tsx b/app/contributors/ContributorsSearch.type-compiler.test.tsx
new file mode 100644
index 000000000..58ecb7a38
--- /dev/null
+++ b/app/contributors/ContributorsSearch.type-compiler.test.tsx
@@ -0,0 +1,104 @@
+import { describe, it, expect, expectTypeOf } from 'vitest';
+import { z } from 'zod';
+import ContributorsSearch from './ContributorsSearch';
+import React from 'react';
+
+// Extract the Contributor type from the component's props
+type Contributor = NonNullable<
+  React.ComponentProps<typeof ContributorsSearch>['contributors']
+>[number];
+
+describe('ContributorsSearch type & schema compiler checks (Variation 10)', () => {
+  it('Case 1: Validate core property shapes match design boundaries', () => {
+    type ExpectedContributor = {
+      id: number;
+      login: string;
+      avatar_url: string;
+      contributions: number;
+      html_url: string;
+    };
+
+    expectTypeOf<Contributor>().toEqualTypeOf<ExpectedContributor>();
+  });
+
+  it('Case 2: Ensure invalid parameters are blocked via static assignability', () => {
+    type InvalidContributor = {
+      id: string; // wrong type
+      login?: string; // optional where required
+      avatar_url: number; // wrong type
+    };
+
+    expectTypeOf<InvalidContributor>().not.toMatchTypeOf<Contributor>();
+  });
+
+  it('Case 3: Optional fields accepted safely without compile-time warnings', () => {
+    // Props for ContributorsSearch accepts optional contributors
+    type SearchProps = React.ComponentProps<typeof ContributorsSearch>;
+
+    const minimalProps: SearchProps = {}; // empty object because contributors is optional
+
+    const partialProps: SearchProps = {
+      contributors: [],
+    };
+
+    expectTypeOf<typeof minimalProps>().toMatchTypeOf<SearchProps>();
+    expectTypeOf<typeof partialProps>().toMatchTypeOf<SearchProps>();
+    expect(minimalProps).toEqual({});
+    expect(partialProps).toEqual({ contributors: [] });
+  });
+
+  it('Case 4: Zod runtime schema flags out-of-bound structural types with strict reports', () => {
+    const contributorSchema = z
+      .object({
+        id: z.number().int().positive(),
+        login: z.string().min(1),
+        avatar_url: z.string().url(),
+        contributions: z.number().int().nonnegative(),
+        html_url: z.string().url(),
+      })
+      .strict();
+
+    const badPayload = {
+      id: -5,
+      login: '',
+      avatar_url: 'not-a-url',
+      contributions: -1,
+      html_url: 'not-a-url',
+      extra_field: 'unexpected',
+    };
+
+    try {
+      contributorSchema.parse(badPayload);
+      expect(false).toBe(true);
+    } catch (err) {
+      const zErr = err as z.ZodError;
+      expect(zErr.issues.length).toBeGreaterThan(0);
+
+      // Ensure it caught strictness error (unrecognized_keys)
+      const hasUnrecognized = zErr.issues.some((i) => i.code === z.ZodIssueCode.unrecognized_keys);
+      expect(hasUnrecognized).toBe(true);
+    }
+  });
+
+  it('Case 5: Correct payloads safely clear validation limits', () => {
+    const contributorSchema = z.object({
+      id: z.number().int().positive(),
+      login: z.string().min(1),
+      avatar_url: z.string().url(),
+      contributions: z.number().int().nonnegative(),
+      html_url: z.string().url(),
+    });
+
+    const goodPayload = {
+      id: 123,
+      login: 'test-user',
+      avatar_url: 'https://example.com/avatar.png',
+      contributions: 10,
+      html_url: 'https://github.com/test-user',
+    };
+
+    const parsed = contributorSchema.parse(goodPayload);
+    expect(parsed).toEqual(goodPayload);
+    expectTypeOf<typeof parsed>().toMatchTypeOf<Contributor>();
+  });
+});