feat: support IntelliJ IDEA open-in launch

[cenumi]

What Changed

• Added IntelliJ IDEA to the “Open in” picker in the web UI.
• Refactored editor launch config from supportsGoto boolean to a launchStyle model so different editors can express their actual CLI behavior.
• Updated server-side editor launch resolution to support three navigation modes:
  • direct path
  • --goto
  • --line/--column
• Changed Antigravity's launchStyle to goto.
• Added coverage for IntelliJ IDEA launch behavior and the per-editor argument handling logic.

Why

The old editor-launch model was too limited. A single supportsGoto flag only works for editors that accept --goto, which breaks down as soon as an editor uses a different CLI contract.

This PR fixes that design flaw instead of piling on another hack:

• IntelliJ IDEA is now supported.
• Existing editors keep their expected behavior.
• The launch logic is more explicit, maintainable, and easier to extend for future editors.

UI Changes

• Added IntelliJ IDEA as a new option in the “Open in” picker.

Before

After

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

---

Note

Medium Risk
Medium risk because it changes shared editor contracts and server-side argument construction for multiple editors, which could break open-in-editor behavior if CLI expectations differ across platforms.

Overview
Adds IntelliJ IDEA as a supported EditorId and exposes it in the web “Open in” picker (including a new IntelliJIdeaIcon).

Replaces the supportsGoto flag with a launchStyle model (direct-path, goto, line-column) and refactors server-side resolveEditorLaunch to build editor-specific CLI args accordingly (including parsing path:line:column targets). Updates tests to cover IDEA’s --line/--column behavior and the new per-editor launch-style routing (including antigravity now using --goto).

^{Written by Cursor Bugbot for commit 648e204. This will update automatically on new commits. Configure here.}

Note

Add IntelliJ IDEA as a supported editor with --line/--column navigation

• Adds idea to the EDITORS list in editor.ts with launchStyle: 'line-column', making it a valid EditorId.
• Replaces the boolean supportsGoto field with a launchStyle discriminant ('direct-path', 'goto', or 'line-column') across all editor definitions.
• Introduces resolveCommandEditorArgs in open.ts to build CLI args per launch style, replacing the previous shouldUseGotoFlag logic.
• Adds an IntelliJIdeaIcon component to Icons.tsx and surfaces an IntelliJ IDEA option in the OpenInPicker.
• Behavioral Change: Zed now uses direct-path (no --goto) and all previously supportsGoto: true editors retain equivalent goto behavior.

^{Macroscope summarized 648e204.}

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[macroscopeapp]

Approvability

Verdict: Approved

This PR adds IntelliJ IDEA as a new editor option with appropriate command-line argument handling. The changes are additive with good test coverage, and the refactor from boolean supportsGoto to enum launchStyle is mechanical and preserves existing behavior for all current editors.

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[juliusmarminge]

Works. Given that idea is not installed by default and you gotta follow their guide here: https://www.jetbrains.com/help/idea/working-with-the-ide-features-from-command-line.html#standalone