app: test on mac/ios/win

[obfusk]

Works

• linux: firefox
• linux: chromium
• android: webview
• android: firefox
  • tooltips work, but context menu also appears
• ipad: safari
  • tooltips do not work (not that important, probably no way to fix)
  • doesn't remove original w/ japanese input + kana conversion (not that important, probably no way to fix)

Needs testing

• windows: edge
• macos: safari
• iphone: safari

Should work but untested

• windows: firefox
• windows: chrome
• macos: firefox
• macos: chrome
• android: chrome