ScanTailor Spectre 2.0b2

Version 2.0b2 | macOS (Apple Silicon) | Requires macOS 15 or later

PDF import now accepts PDFs with junk bytes (such as a UTF-8 BOM) before the %PDF header, matching Preview's behavior. PDFs exported by Zotero/Papers were being rejected outright with a generic "Failed to read PDF file." — checkMagic required %PDF- at byte 0; it now searches the first 1024 bytes. A PDF that CoreGraphics briefly refuses to open because Zotero is still staging the file is now retried for up to a second instead of being treated as malformed.
Failed PDF imports now say why: a Qt file-open/read error (with the system errno), a missing %PDF header, a CoreGraphics rejection, or a zero-page document each report their actual cause instead of one generic failure message.
Fixed a bug where using Convert to Black and White / Grayscale / Color — the new right-click thumbnail menu in the Finalize and Output stages — on a page discarded that page's existing black-and-white threshold, color options, and photo adjustments instead of only changing its color mode. The c/g/b keyboard shortcuts had the same problem and are fixed the same way.
Right-clicking thumbnails in the Finalize and Output stages offers Convert to Black and White, Convert to Grayscale, and Convert to Color, applied to all selected pages, matching the c/g/b shortcuts (the Finalize stage's mode display now stays in sync with both).

File	SHA-256
`ScanTailor-Spectre-2.0b2-20260816-0107.dmg` (136 MB)	`29fdf312de7c513d39cdd57629fe74b85d6ee4264ca4a0ad06f595421ce278cb`
`ScanTailor-Spectre-2.0b2-20260816-0107.zip` (122 MB)	`8b5ebd77acd29abb9c6a34ac7e3b2828102f250aa7820edb11fd2f6845ec1632`

Both are notarized and stapled by Apple; Gatekeeper accepts them with no override needed.

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