Burn2Disk

• Bug 1 - USB burn "No files were written to USB" (FIXED) Two independent causes were fixed:
• FastUsbWriter fat[] integer arithmetic
• writeFatChain and flushFatSectors now keep all index variables as Long throughout. Added explicit idx < 0L || idx >= fat.size bounds checks before every .toInt() conversion. This prevents silent corruption if cluster numbers ever approach Int range edge cases. False-positive first-file write verification
• The immediate read-back after the first file write (lines 807-829) was comparing device bytes against source bytes right after the SCSI write returned. USB controllers have write-back caches: data may not be flash-readable until the controller flushes internally. This caused a FALSE positive mismatch on many drives, aborting the burn with "USB write verification failed" even though the write was correct. Removed the immediate read-back. Post-burn root-directory verification (reading back root cluster entries after flush) remains as the reliable signal.
• Bug 2 - SD card not showing on Device Selection screen (FIXED) Root cause: Xiaomi HyperOS/MIUI reports physical SD cards as isEmulated=true, so StorageManager detection returned null. Also getExternalFilesDirs()[1] was null when no app directory existed on the card. Fix: The SD card section is now ALWAYS rendered, even when auto-detection fails. If detected: shows capacity and filesystem (same as before). If not detected: shows a "SD Card" card with text "Auto-detection failed — tap to select SD card folder manually" and a SAF picker. SAF works on ALL filesystems (FAT16, FAT32, exFAT, NTFS, ext4) without root. If a persisted SAF URI already exists, the card shows "SD Card (access granted)".
• Changed Bumped version to 1.2.3 (versionCode 23).

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