Scan QR code from gallery image#664
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Adds a button in QR-scan mode that opens the system photo picker and decodes a code from the chosen image, reusing the existing scan-result dialog. Decoding uses a new QRAnalyzer.scanStillImage() that builds an RGBLuminanceSource instead of the camera's PlanarYUVLuminanceSource, with TRY_HARDER and an inverted-source fallback, honoring the current format toggles.
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Adds a button in QR-scan mode that opens the system photo picker and decodes a code from the chosen image. It reuses the existing scan result dialog.
The new button is added at the bottom right.
Implements #593