Feature: file-reference keyboard shortcut (Cmd+Option+K / Ctrl+Alt+K) to insert @file references

[sxin0]

Summary

Request: add a keyboard shortcut in Junie (CLI / IDE integration) to quickly insert a
file reference into the prompt — e.g. @path/to/file.ext#L1-99 — without typing
the path and line range by hand.

Why

When pointing Junie at a specific file or line range, the path and #Lstart-end currently
have to be typed manually. A dedicated shortcut would:

• Speed up targeting the right code
• Reduce typos in paths and line ranges
• Bring Junie in line with the UX other AI coding integrations already offer

Reference implementation

The Claude Code [Beta] JetBrains plugin ships exactly this and is a good model:

File reference shortcuts: Use Cmd+Option+K (Mac) or Ctrl+Alt+K (Linux/Windows)
to insert file references (e.g., @File#L1-99)

Plugin page: https://plugins.jetbrains.com/plugin/27310-claude-code-beta-

Proposed

• Cmd+Option+K (macOS) / Ctrl+Alt+K (Linux & Windows)
• Inserts a file-reference token (@<path>#L<start>-<end>) at the cursor in the active prompt
• Defaults to the currently active/selected editor file, using the current selection's
  line range when text is selected

Happy to help refine the token format to match Junie's existing @-mention conventions
if they differ.