[FEATURE] Desktop app "Open in" menu: support JetBrains IDEs (Rider) / custom editors

Feature Description

In the Claude Code desktop app (macOS), right-clicking a file reference in the chat transcript shows a context menu with an "Open in" submenu. Currently it only detects a hardcoded set of editors (VS Code, Cursor, Zed — per the docs), and for users of JetBrains IDEs the submenu shows only Finder.

Please add JetBrains IDEs (Rider, IntelliJ IDEA, WebStorm, PyCharm, etc.) to the "Open in" detection — or better, make the list configurable / respect the OS default app association for the file type.

Use Case

I work on a Unity C# project and use JetBrains Rider as my editor. When Claude references a file like Assets/Game/.../Foo.cs:123, I'd like to jump straight to that file (ideally at the line number) in Rider. Today the only options are opening Finder or copying the path and searching manually in the IDE, which breaks the flow many times a day.

JetBrains IDEs all ship a CLI launcher (e.g. rider --line 123 <path>, idea --line ...), so line-accurate opening is feasible.

Prior Issues

This was previously requested but the issues were closed as inactive/duplicates without resolution:

• #42222 (closed as not planned / inactive, with a note to open a new issue if still relevant — hence this one)
• #72721 (closed as duplicate of #42222)
• #72439 (hardcoded "Open in..." list doesn't respect OS default app)
• #61306 (desktop equivalent of CLI /ide)

Proposed Solution

Any of these would solve it:

1. Detect installed JetBrains IDEs (via Toolbox/~/Applications/Spotlight) and add them to the "Open in" submenu, passing --line when a line number is available.
2. A settings option to register custom editors (name + command template).
3. Fall back to the OS default application for the file extension.