docs(fliplet-barcode): use window.cordova for V3 web/native detection

[farhantariq12b]

Summary

The fliplet-barcode docs were prescribing a navigator.mediaDevices.getUserMedia-based detection signal for the V3 AI builder's "Recommended pattern (web + native)." That check is unreliable inside Cordova WebView — modern Android WebView fully supports getUserMedia, so apps running natively were being routed down the web path. The browser-shaped flow then called getUserMedia directly, which the WebView's default SystemWebChromeClient.onPermissionRequest "granted" without actually requesting Android system permission — silently failing to acquire the camera.

The library itself already solves this cleanly:

// fliplet-api/public/assets/fliplet-barcode/1.0/barcode.js:122-131
if (Fliplet.Env.is('web')) {
  return htmlScan();
}
// ...
cordova.plugins.barcodeScanner.scan(resolve, reject, options);

cordova.plugins.barcodeScanner is the existing phonegap-plugin-barcodescanner plugin shipped in fliplet-android-version-2 (cordova/plugins/phonegap-plugin-barcodescanner/ + libs/barcodescanner-release-2.1.5.aar). It handles CAMERA permission via the standard cordova.requestPermissions(CAMERA) flow — OS popup appears, ZXing native scanner UI opens. No Java patches required.

The catch: Fliplet.Env.is('web') is unreliable inside V3 Studio preview iframes (they set window.ENV.platform === 'native' even though Cordova isn't loaded), which is why the library can't be called bare from V3 apps the way it's called from V1's form-builder codeScanner field (fliplet-widget-form-builder/js/components/codeScanner.js:50).

This PR makes the recipe route to Fliplet.Barcode.scan() only when the native Cordova runtime is actually loaded, and uses inline html5-qrcode on web/preview for component-style UX.

What changed

• Detection signal: typeof window.cordova !== 'undefined' — defined only when the native runtime has loaded; absent in Studio preview iframes and on published web. Replaces navigator.mediaDevices.getUserMedia (returned true on Cordova WebView, broke native flow).
• Native path: Fliplet.Barcode.scan({ prompt }) only. Internally routes through the cordova plugin → OS popup → ZXing UI. No getUserMedia / Html5Qrcode / permission warm-up on native.
• Web/preview path: inline new window.Html5Qrcode('web-scanner', { verbose: false }).start(...) into a <div id="web-scanner"> with min-height: 320px. Browser handles its own permission prompt.
• Single chain load: Fliplet.require.lazy.chain('fliplet-barcode') serves both paths — chain bundles html5-qrcode.min.js AND barcode.js. Reaffirms: do NOT declare html5-qrcode separately, do NOT use jsqr.
• What NOT to do list updated with the new prescriptions (no Fliplet.Env.is, no window.ENV.platform, no getUserMedia for detection, no Html5Qrcode on the native path).
• Drops the requestCameraPermission warm-up that earlier recipe versions used — was a workaround for routing Cordova WebView to the web path; no longer applicable now that Cordova goes through Fliplet.Barcode.scan().

Companion catalog notes (so search_libraries returns the new guidance for the V3 builder) are in fliplet-studio branch fix/v3-barcode-html5-qrcode-chain — PR not opened yet.

Why this matters

The V3 AI builder kept emitting scanner apps that needed either (a) a per-fork Java patch to SystemWebChromeClient.onPermissionRequest, or (b) a defensive fallback that pulled html5-qrcode from cdn.jsdelivr.net at runtime — both unnecessary once the recipe stops bypassing the cordova plugin. Customer apps shipping with the previous recipe would have needed shell-fork maintenance to acquire camera on Android; this PR makes the recipe work first-attempt against an unmodified Fliplet Android shell, matching how V1 form-builder apps have always invoked the scanner.

End-to-end verified with FLIPLET_CLI_BRANCH=fix/v3-barcode-html5-qrcode-chain against a freshly-generated V3 app: agent produced conforming Scanner.vue (window.cordova check, Fliplet.Barcode.scan() on native, inline Html5Qrcode on web). Web scan worked in Studio preview without modification.

Test plan

• V1 parity check: fliplet-widget-form-builder/js/components/codeScanner.js:50 calls Fliplet.Barcode.scan() — same library + cordova plugin + permission mechanism the new recipe uses.
• Plugin presence verified in shell: assets/www/cordova_plugins.js registers cordova.plugins.barcodeScanner; libs/barcodescanner-release-2.1.5.aar bundled; src/com/phonegap/plugins/barcodescanner/ compiled.
• Chain bundles html5-qrcode: inspected pages.html chain JSON layer 1 → cdn.fliplet.test/assets/html5-qrcode/2.3.8/html5-qrcode.min.js. Chain load exposes window.Html5Qrcode globally.
• V3 builder fresh-app gen produces conforming Scanner.vue (verified via FLIPLET_CLI_BRANCH override on local dev stack).
• Web preview test: tap "Scan" → browser permission popup → inline scanner → scans QR → ticket verified.
• Reviewer: confirm renders cleanly via bundle exec jekyll build after merge.
• Native device test (any device, no Java patch): tap "Scan" → OS popup via cordova plugin → ZXing scanner → scans QR.

🤖 Generated with Claude Code

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