[FEATURE] Support JetBrains IDEs (and custom editors) in the desktop "Open in" menu

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

In the Claude Code desktop app, right-clicking a file reference in the chat, diff viewer, or file pane offers an "Open in" submenu. Today this menu only lists auto-detected editors from a fixed set (VS Code, Cursor, Zed) — all VS Code–family editors. JetBrains IDEs such as Rider, IntelliJ IDEA, PyCharm, WebStorm, and GoLand never appear, even when they're installed, and there is no setting to register them.

For developers who live in a JetBrains IDE, this means there's no way to jump from a Claude Code reference into their actual editor. The only options are the in-app pane or a VS Code–family editor they may not use.

Proposed Solution

Two possible approaches, either would solve it:

1. Detect and list JetBrains IDEs in the "Open in" menu the same way VS Code / Cursor / Zed are detected, invoking their command-line launcher (e.g. rider --line <n> <path>) so the file opens at the referenced line/range when present.
2. Allow a user-defined custom editor — a setting where the user specifies an executable path and an argument template (with placeholders for file path and line number). This generalizes the menu to any editor without Anthropic having to add each one.

Option 2 is more future-proof and covers editors like Sublime Text, Neovim, Emacs, etc. as well.

Alternative Solutions

Currently the only workaround is to right-click → Copy path, then manually invoke the IDE's command-line launcher from the integrated terminal. This works but adds friction on every jump.

Priority

Medium - Would be very helpful

Feature Category

Configuration and settings

Use Case Example

Working in the desktop app on a C#/.NET project, Claude references src/Geometry/NurbsSurface.cs:142. I want to right-click → Open in → Rider and land on line 142 in my running Rider instance to make an edit, rather than viewing it in the in-app pane.

Additional Context

Related to #54027 (request for Cmd/Ctrl+click to open in the default external editor), which was closed as not planned. This request is narrower and distinct: it's about which editors are available in the existing "Open in" menu, not about changing click behavior. Adding JetBrains detection or a custom-editor setting would make that existing menu useful to JetBrains users.

Duplicate of #42222, which was closed due to inactivity.