Image file dropped from Alacritty onto a remote-machine pane arrives as a local path instead of bridging

[gbirman]

Is this a reproducible bug?

• I confirm this is a reproducible bug, not a feature request, idea, question, contribution proposal, or direction check.
• I reproduced this bug on the version and environment reported below using the exact steps provided.

Current behavior

Dragging a saved PNG from Finder into Alacritty, onto a pane on a saved SSH machine, types the local Mac path into the remote pane. The remote agent cannot read it. Ctrl+V of an image on the clipboard into the same pane bridges correctly (the remote server log shows staged client clipboard image).

Expected behavior

The dropped image is bridged to the remote machine, the same as a clipboard paste, and the remote staged path is inserted.

Reproduction

1. herdr machine add <host> and open a workspace on that machine from a Mac running Alacritty 0.17.0.
2. Start Claude Code in a pane on the remote machine.
3. Save a screenshot to ~/Desktop and drag the saved file from Finder onto the pane.
4. The pane receives /Users/<me>/Desktop/<file>.png (local path) and no staged client clipboard image line appears in the remote server log.

Impact

Drag-and-drop of screenshots into remote agents does not work from Alacritty; I have to copy the image and use Ctrl+V instead.

Environment

• Herdr version: 0.9.0 (client and remote server)
• Update channel (stable or preview): stable
• Operating system: macOS 26.6.2, remote Debian 13
• Terminal: Alacritty 0.17.0
• Shell, if relevant: zsh
• Relevant config, if any: none related (default keys.remote_image_paste)

[akbash-bot]

Could you capture the text Alacritty sends for one dropped PNG? This will tell us whether its trailing space prevents Herdr from recognizing the image.

1. Open a fresh local Alacritty window outside Herdr and SSH, then run:

   printf '\033[?2004h'; /usr/bin/od -An -tx1; printf '\033[?2004l'

2. Drop one saved PNG into that window, press Enter, then Ctrl+D to finish.
3. Paste the hexadecimal output rows here.

Nothing is written to disk. The output contains the file path, not the image contents; use an innocuously named file and redact your username if needed, preserving spaces and punctuation.

[gbirman]

Captured in a fresh local Alacritty 0.17.0 window, outside Herdr and SSH, dropping /private/tmp/drop-test.png from Finder:

1b 5b 32 30 30 7e 2f 70 72 69 76 61 74 65 2f 74
6d 70 2f 64 72 6f 70 2d 74 65 73 74 2e 70 6e 67
20 1b 5b 32 30 31 7e 0a

That is ESC[200~/private/tmp/drop-test.png ESC[201~ followed by the Enter: Alacritty sends the path as a bracketed paste with a trailing space (20) before the closing ESC[201~.