Auto-open desktop app via deep link using hidden iframe

[yujonglee]

• Extract shared DeeplinkPrompt component and useAutoDeeplink hook from duplicated code in auth/integration callback pages
• Use hidden iframe technique on macOS to open custom URL schemes without triggering browser's "leave site?" dialog (ref: https://pepicrft.me/blog/deep-linking-into-macos-apps/)
• Auto-trigger deep link on page load (e.g. after OAuth redirect) instead of requiring manual click, with fallback window.location.href on non-macOS

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[netlify]

✅ Deploy Preview for char-cli-web canceled.

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