feat: add Antigravity as an "Open in editor" target (#1424)

Registers the Google Antigravity IDE so the workspace Open-in-editor
picker detects and launches it (PATH probe for the "antigravity"
command), alongside Cursor, VS Code, WebStorm, and Zed.

- desktop: add the target to BUILT_IN_EDITOR_TARGETS (kind: editor).
- app: add "antigravity" to the known editor-target id set and map its
  bundled icon.

Co-authored-by: Mathias Kurz <mkurz@stamus-networks.com>

packages/app/src/components/icons/editor-app-icons.tsx

@@ -15,6 +15,7 @@ const EDITOR_APP_IMAGES: Record<string, ImageSourcePropType> = {
   vscode: require("../../../assets/images/editor-apps/vscode.png"),
   webstorm: require("../../../assets/images/editor-apps/webstorm.png"),
   zed: require("../../../assets/images/editor-apps/zed.png"),
+  antigravity: require("../../../assets/images/editor-apps/antigravity.png"),
   finder: require("../../../assets/images/editor-apps/finder.png"),
   explorer: require("../../../assets/images/editor-apps/file-explorer.png"),
   "file-manager": require("../../../assets/images/editor-apps/file-explorer.png"),

packages/app/src/workspace/editor-targets.ts

@@ -5,6 +5,7 @@ const KNOWN_EDITOR_TARGET_IDS: ReadonlySet<string> = new Set([
   "vscode",
   "webstorm",
   "zed",
+  "antigravity",
   "finder",
   "explorer",
   "file-manager",

packages/desktop/src/features/editor-targets.ts

@@ -73,6 +73,7 @@ const BUILT_IN_EDITOR_TARGETS: readonly EditorTargetDefinition[] = [
   { id: "vscode", label: "VS Code", kind: "editor", command: "code" },
   { id: "webstorm", label: "WebStorm", kind: "editor", command: "webstorm" },
   { id: "zed", label: "Zed", kind: "editor", command: "zed" },
+  { id: "antigravity", label: "Antigravity", kind: "editor", command: "antigravity" },
   {
     id: "finder",
     label: "Finder",