Fix tests to match recent validation changes

Update tests to reflect two recent changes:
1. HTTP URLs are no longer accepted for image URIs (only HTTPS)
2. Custom avatar/header fields now show reservedKey error instead of
   avatarReserved since media record group was commented out

- validateImageUri.test.ts: Update HTTP tests to expect errors
- Profile.test.tsx: Update avatar validation test for reservedKey error

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: storywithoutend

src/components/pages/profile/[name]/registration/steps/Profile/Profile.test.tsx

@@ -217,15 +217,9 @@ describe('Profile', () => {
     )
   })
 
-  it('should show an error for duplicate label on custom avatar field if media avatar record exists', async () => {
+  it('should show an error for reserved key on custom avatar field', async () => {
     const overrides = {
       records: [
-        {
-          key: 'avatar',
-          value: 'https://example.com',
-          type: 'text',
-          group: 'media',
-        },
         {
           key: 'avatar',
           value: 'https://example.com',
@@ -245,6 +239,6 @@ describe('Profile', () => {
     )
     await userEvent.click(screen.getByTestId('profile-submit-button'))
     await waitFor(() => expect(mockCallback).not.toHaveBeenCalled())
-    expect(screen.getByText('steps.profile.errors.avatarReserved')).toBeInTheDocument()
+    expect(screen.getByText('steps.profile.errors.reservedKey')).toBeInTheDocument()
   })
 })

src/validators/validateImageUri.test.ts

@@ -13,9 +13,9 @@ describe('validateImageUri', () => {
     expect(validateImageUri(undefined)).toBe('Image URL is required')
   })
 
-  it('should return true for HTTP URLs', () => {
+  it('should return error for HTTP URLs', () => {
     const result = validateImageUri('http://example.com/image.jpg')
-    expect(result).toBe(true)
+    expect(result).toBe('Image URL must use HTTPS protocol')
   })
 
   it('should accept URLs with credentials', () => {
@@ -95,8 +95,8 @@ describe('isValidImageUri', () => {
     expect(isValidImageUri(undefined as any)).toBe(false)
   })
 
-  it('should return true for HTTP URLs', () => {
-    expect(isValidImageUri('http://example.com/image.jpg')).toBe(true)
+  it('should return false for HTTP URLs', () => {
+    expect(isValidImageUri('http://example.com/image.jpg')).toBe(false)
   })
 
   it('should return false for invalid URLs', () => {