macOS local session: live screenshot thumbnail drag-and-drop is silently swallowed

[stephen-tatari]

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 the live/unsaved screenshot preview thumbnail (from macOS screenshot capture, before it is saved to disk) into a herdr pane running locally produces no output at all: no text, no image, nothing in the pane or the foreground program.

Expected behavior

Same as a bare WezTerm shell with no herdr running (reproduction step 3 below): the dropped file's path is inserted as text into the pane.

Reproduction

1. Take a screenshot (Cmd+Shift+4) so its floating thumbnail is on screen; do not click it away.
2. Drag that thumbnail into a herdr pane (local session). Nothing happens.
3. Drag the same thumbnail into a bare WezTerm pane with herdr fully quit: the file path is inserted as text.
4. Save the screenshot to disk, then drag the saved file into the same herdr pane from step 2: it works normally.

Impact

Drag-and-drop of an in-progress screenshot into any local herdr pane is unusable; only Ctrl+V clipboard paste or manually saving the file first work around it.

Environment

• Herdr version: 0.7.5
• Update channel (stable or preview): stable
• Operating system: macOS 26.5.2
• Terminal: WezTerm 0-unstable-2026-06-22
• Shell, if relevant: zsh (login shell)
• Relevant config, if any: local session (not --remote)