Baixar SageThumbs 2K 3.4.0 per a Windows

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## TL;DR

- **Thumbnails in OneDrive, Synology Drive and other cloud folders**, even for fully downloaded files (fixes #16)
- **Thumbnails no longer stop after a busy session** until a restart
- **Quick preview stays above the taskbar** and opens where you last put it
- **FreeCAD backups** (`.FCBak`, `.FCStd1`) get thumbnails (363 file types in all)
- **Searchable PDFs:** combine scans into a PDF you can search and copy text from
- **`st2k doctor` names the thumbnail handler Windows really uses** for a file

<details>
<summary><b>Read more: everything in 3.4.0</b></summary>

- **Thumbnails in OneDrive, Synology Drive and other cloud folders.** Windows asks only the cloud app for a thumbnail of a file in a synced folder, even a fully downloaded one, so Paint.NET, Affinity, PSD and every other SageThumbs format showed a plain icon there (fixes #16). SageThumbs now takes its turn first for files that are on your PC and hands everything else, including online-only files, back to the cloud app; nothing is ever downloaded just to draw a thumbnail. On by default, with a switch in Settings > General, and `st2k doctor` now reports each cloud folder and whether it is linked.
- **Thumbnails no longer stop after a busy session.** When Explorer gave up on a slow file mid-decode, SageThumbs could lose one of its four ImageMagick slots for good; after a few of those every exotic-format thumbnail stalled, Explorer kept giving up, and only a restart brought them back. A slot whose owner is gone is now taken over at once.
- **Quick preview stays above the taskbar and remembers where you put it.** A tall picture no longer opens or grows underneath the taskbar, and the window opens where you last dragged it (double-click its title bar to go back to centred).
- **FreeCAD backups** (`.FCBak`, `.FCStd1`) get the same thumbnail as the `.FCStd` they were saved from (363 file types in all).
- **`st2k doctor` names the thumbnail handler Windows actually uses** for a file, and says when that handler belongs to another program or is built for a different processor than this PC (an x64-only DLL on an ARM64 PC, #47).
- **Searchable PDFs:** the new right-click **Combine into searchable PDF (OCR)**, `st2k pdf --searchable` and the MCP `pdf` tool's `searchable` option read every page with Windows' own OCR and add an invisible text layer, so scans and photos turned into a PDF can be searched, and their text selected and copied, in any PDF viewer. Pages OCR could not read still go in without text, and the CLI (`no text:` line) and JSON (`pages_without_text`) say how many.
- **Hardening.** The step every decoded picture goes through before it becomes a thumbnail or a preview (shrinking, enlarging, rotating, and the contact sheet for archives) is now fuzzed with images that are always valid, in every pixel format and shape, and checked for the right size and colour rather than only for crashes. The deep fuzz sessions now run every night instead of only before a release.

</details>

## Downloads

Every file below is code-signed by LUNARWERX LLC; the SHA-256 lets you check a download is the one published here.

- **x64 installer:** `SageThumbs2K-Setup-3.4.0.exe` ┬╖ SHA-256 `bc6c716852a7a158b14f0e3bc555a8fd3fbc91dc83d4f5947645a7c61cbe8140`
- **ARM64 installer:** `SageThumbs2K-Setup-3.4.0-arm64.exe` ┬╖ SHA-256 `ebd14063bb57b2075db6d1614c2966e58a6ad7af1977aa251f78e460c007b5d3`
- **x64 portable:** `SageThumbs2K-Portable-3.4.0.zip` ┬╖ SHA-256 `9922716f1cbef6e4d4b266b42b9f43449ac9046cebdf89076d4f31a292e1ce79`
- **arm64 portable:** `SageThumbs2K-Portable-3.4.0-arm64.zip` ┬╖ SHA-256 `45516d4c4e0cd95b59b96c57e1fcdf8feb22d14d1d781f70bfbdb1a9360ff796`

Portable: unzip and run, nothing is installed. `st2k register` (or Settings, Advanced) turns on Explorer thumbnails and the classic right-click menu for your account; only the preview pane, the Details pane and the Windows 11 compact menu still need the installer. `SageThumbs2K-Setup-3.4.0-amd64.exe` is the x64 installer again, under the name copies older than 1.3.6 look for; download the plain one.

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