Form rendering fix, plus all features and fixes from 1.2.0/1.2.1:
- Fixed pre-filled form fields showing duplicate/overlapping text when reopening a saved PDF or switching between document tabs.
- Critical (1.2.1): Fixed filled form fields not saving on many PDFs. Widget annotations not registered in the PDF's AcroForm dictionary were silently skipped at save time.
- PDF/A Export: Export documents as PDF/A-1b, 2b, or 3b for ISO-compliant long-term archiving.
- Custom Stamps: Create your own stamps with multi-line text, custom colors, and flexible positioning.
- PDF Security Scanning: Detects potentially dangerous elements (JavaScript, Launch actions, XFA forms, embedded files) before opening.
- PDF Sanitization: Strip dangerous elements while preserving document content and form fillability.
- Native PDF Decryption: Password-protected PDFs now decrypt using native Rust instead of requiring external qpdf.
- Form Field Fixes: Radio buttons, dropdowns, and merged PDF form fields now save correctly. Form labels remain visible through translucent field backgrounds.
- Text Annotation Fixes: Font size, color, and font family changes now persist correctly after editing, resizing, or losing focus.
- Flatpak Improvements: Ghostscript/qpdf bundled for PDF/A and compression; network permission added for OCR language downloads.
- Dark Theme: Fixed dialog option contrast in Compression and PDF/A export dialogs.
- Ctrl+S now works while focused on form inputs.
