Add VS Code Insiders and VSCodium to Open In editor picker

[nassimna]

Adds VS Code Insiders and VSCodium to the existing Open In editor flow.

What changed:

• extend shared editor contracts with vscode-insiders and vscodium
• use per-editor supportsGoto metadata so --goto works for both editors
• update the web Open menu to surface the new editors when installed
• add server and browser tests for availability detection, picker filtering, and open dispatch

Why:

• this follows the existing editor integration pattern instead of introducing a separate code path
• the change is scoped to the current Open In feature only
• behavior stays predictable: editors only appear when their CLI is available on PATH

Validation:

• bun run test src/open.test.ts in apps/server
• bun run test:browser src/components/ChatView.browser.tsx in apps/web
• bun fmt
• bun lint
• bun typecheck

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Note

Low Risk
Low risk: adds two new editor options and metadata-driven --goto handling with test coverage, without changing core auth/data flows.

Overview
Adds VS Code Insiders (vscode-insiders/code-insiders) and VSCodium (vscodium/codium) to the shared EDITORS contract and surfaces them in the web OpenInPicker menu only when reported as installed.

Updates server-side editor launching to rely on per-editor supportsGoto metadata (instead of hardcoded IDs) when deciding to pass --goto for path:line:col targets, and expands server/browser tests to cover availability detection, picker filtering, and open-dispatch/fallback behavior.

^{Written by Cursor Bugbot for commit 3796c2f. This will update automatically on new commits. Configure here.}

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