Stability release

A stability release.

Bug fixes

• Viewers (PDF, image, Markdown, code, SVG, hex, tabular, programs, archives) are more resilient: fewer stalls on large or malformed files, correct behaviour when a file changes or moves while open, and clearer messages when something cannot be shown.
• Text and Markdown editing keeps your feedback and unsaved state across background refreshes and saves reliably.
• Remote and cloud connections (FTP, SFTP, S3, Google Drive, WebDAV and others) handle interrupted transfers, slow servers and very large listings without hanging or leaking resources. Upload errors are reported instead of swallowed.
• Archives refuse ambiguous or incomplete inputs out loud, cancel previews cleanly, and no longer keep passwords in memory longer than needed.
• Chat and search stay within their scope, report failures instead of going quiet, and no longer repeat earlier narration.
• Git views stay responsive on large repositories and no longer race each other when reading the repository.
• Duplicates, batch rename, drag and drop and file operations report failures from every entry point and can be cancelled safely.
• Settings are saved before they are applied, and invalid values are contained instead of breaking the window.
• Windows opened over a minimized main window now appear in the right place.
• Background work (thumbnails, indexing, embeddings, reranking, model downloads) shuts down cleanly and shows what it is waiting on in the task panel.
• Numerous memory, timing and lifetime fixes across the board that make the application steadier during long sessions.

New features

• 3D models (STL) get real thumbnails and a Quick view card you can rotate by dragging. Surface area and volume are shown as facts.
• Icons and cursors (.ico, .cur) open on their largest frame, with a Frame drop-down to switch sizes. Thumbnails show the best frame, and a cursor's hotspot is listed.
• Certificates and keys (PKCS containers, PEM keys, certificate requests, OpenPGP, Java keystores, CRLs, profiles) show a metadata card. Private material is never displayed or indexed.
• More picture formats are recognised and open in the image viewer instead of falling back to a generic icon.
• The code viewer remembers whether the Outline panel was open, like the PDF page sidebar.
• Long Markdown documents open faster because they are laid out once instead of twice.