fix: install webkit browser for Playwright tests

The playwright.config.js uses webkit, not chromium.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: pythoninthegrass

.github/workflows/test.yml

@@ -157,7 +157,7 @@ jobs:
 
       - name: Install Playwright browsers
         working-directory: ./src-tauri/dist
-        run: npx playwright install --with-deps chromium
+        run: npx playwright install --with-deps webkit
 
       - name: Run Playwright tests
         working-directory: ./src-tauri/dist