The server choosers listed every configured server without checking mapping coverage or exclusions, so choosing the wrong one silently skipped the files.
- Add a shared eligibility check, available through desktop IPC and host RPC, that never contacts a server.
- Filter Upload to, Download from, Compare and Delete choosers by it. A selection lists a server if it covers at least one path, and the rest are reported as skipped.
- Explain why the default server cannot take a selection, by file name, instead of doing nothing. Apply the same exclusion rules when a transfer runs.
Fixes#538
l0ng-ai
ee2585e7e9