Fix iOS PWA to reuse app instance instead of opening new tabs

templates/manifest.json.erb

@@ -45,8 +45,8 @@
     "density": "5.0"
   }
   ],
-  "start_url": "index.html",
-  "display": "minimal-ui",
+  "start_url": "./",
+  "display": "standalone",
   "background_color": "#efefef",
   "theme_color": "#efefef"
 }

test/render_test.rb

@@ -123,4 +123,32 @@ def test_force_regenerate_skips_cache
 
     puts "✓ Force regeneration feature works correctly"
   end
+
+  def test_manifest_pwa_settings
+    # Test that manifest.json is generated with correct PWA settings for iOS
+    require 'json'
+
+    # Ensure manifest exists
+    assert File.exist?('public/manifest.json'), "manifest.json should be generated"
+
+    # Parse and validate manifest content
+    manifest = JSON.parse(File.read('public/manifest.json'))
+
+    # Check display mode is "standalone" for proper iOS PWA behavior
+    assert_equal "standalone", manifest["display"], 
+      "Display mode should be 'standalone' to prevent opening new tabs on iOS"
+
+    # Check start_url is properly set
+    assert_equal "./", manifest["start_url"], 
+      "start_url should be './' for proper iOS PWA behavior"
+
+    # Verify essential manifest fields exist
+    assert manifest.key?("name"), "Manifest should have a name"
+    assert manifest.key?("short_name"), "Manifest should have a short_name"
+    assert manifest.key?("icons"), "Manifest should have icons"
+    assert manifest["icons"].is_a?(Array), "Icons should be an array"
+    assert !manifest["icons"].empty?, "Icons array should not be empty"
+
+    puts "✓ Manifest PWA settings are correctly configured for iOS"
+  end
 end