Feature: Drag-and-drop file into chat input (VSCode extension)

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

My project has many files with the same name across different
release versions. The @-mention file picker shows ambiguous
results and requires manually copying long file paths into chat.
The current workflow requires me to manually type or paste the
full absolute path to reference a specific file.

Proposed Solution

Allow dragging a file from the IDE file tree directly into the
chat input. When dropped, it should insert a clickable reference
showing the filename as display text with the resolved absolute
path underneath, and Claude should automatically read that file.

Alternative Solutions

Allow dragging a file from the IDE file tree directly into the
chat input. When dropped, it should insert a clickable reference
showing the filename as display text with the resolved absolute
path underneath, and Claude should automatically read that file.

Priority

Low - Nice to have

Feature Category

Interactive mode (TUI)

Use Case Example

1. I have files named "DY_Structure.pine" in 5 different release folders
2. I need to show Claude exactly one specific version
3. With drag-and-drop I could drag from the file tree to chat
4. Claude would instantly know the exact path without ambiguity

Additional Context

VSCode extension / Antigravity IDE. Windows 11.
Similar to how some chat tools handle file attachments via drag-and-drop.