test: update test files to reflect logos→icons rename

Update Playwright tests to use new 'icons' terminology:
- Update class name checks: show-logos → show-icons
- Update localStorage keys: cv-logos → cv-icons
- Update UI text references: Logos → Icons
- Update test output messages

Files modified:
- tests/test-all-features.js - Icon class and persistence checks
- tests/test-all-toggles.js - Icon toggle selector
- tests/test-toggle-complete.js - Icon localStorage key

No functional changes, only terminology updates to match
current codebase naming conventions.

tests/test-all-toggles.js

@@ -57,7 +57,7 @@ const { chromium } = require('playwright');
     // Test Logo Toggle (HTMX - should preserve scroll)
     console.log('\n🖼️  TEST 3: Logo toggle (HTMX)...');
     const scrollBeforeLogo = await page.evaluate(() => window.pageYOffset);
-    await page.locator('.selector-group').filter({ hasText: 'Logos' }).locator('label.icon-toggle').click();
+    await page.locator('.selector-group').filter({ hasText: 'Icons' }).locator('label.icon-toggle').click();
     await page.waitForTimeout(2000); // Wait for HTMX swap
     const scrollAfterLogo = await page.evaluate(() => window.pageYOffset);
     console.log(`   Scroll before: ${scrollBeforeLogo}px, after: ${scrollAfterLogo}px`);