[Bug]: Add to another machine offers binary ignored files but fails to copy them (WorkspaceBinaryFileError) #36256

What happens

In Add to another machine, the list of git-ignored local files offers every file up to 1 MB, binary ones included (images, .DS_Store, SQLite *.db). After the clone, the copy step fails for every selected binary file:

Could not copy 122 files to <machine>
<file>: Failed to read workspace file '<file>' in '<workspace>'.

The server trace shows the cause:

ProjectReadFileError: Failed to read workspace file 'data/x.db-shm' ...
  [cause]: WorkspaceBinaryFileError: Workspace file 'data/x.db-shm' ... is binary and cannot be previewed as text.

Why

The copy (Read file to copy → projects.readFile, then writeFile on the target) goes through the text-preview read, which rejects binary content. The selection filter only checks byteLength <= 1 MiB, so binary files are selectable but can never be copied. Text files in the same selection copy fine.

Repro

1. A repo with a git-ignored binary file under 1 MB (for example screenshot.png listed in .gitignore).
2. Project → Add to another machine, tick that file, start the copy.
3. The toast reports "Could not copy 1 file …" with the error above.

Expected

Either copy binary files byte for byte (a base64 or bytes read/write RPC), or show them as not copyable (greyed out, with a reason) so the dialog does not offer a selection that always fails.

Version

Desktop nightly 0.1.10-nightly.20261113.4643, macOS, both environments on the same build.