Fix: route Antigravity editor link to v1 (antigravity-ide://) after v2 release

[chogyejin]

Problem

After Google released Antigravity v2 (an agent-first platform), the existing LocatorJS
"Antigravity" editor link stopped working as expected — clicking a component now opens v2 instead of
v1 (the IDE). v2 is not a code editor, so files don't open.

Root cause

Antigravity v1 and v2 are separate apps registering different URL schemes on macOS:

App	Bundle ID	URL scheme
Antigravity IDE.app (v1)	com.google.antigravity-ide	antigravity-ide://
Antigravity.app (v2)	com.google.antigravity	antigravity://

LocatorJS was using antigravity://, which is now handled by v2.

Fix

Change the editor link in packages/shared/src/index.ts from antigravity:// to
antigravity-ide://:

 antigravity: {
-  url: "antigravity://file/${projectPath}${filePath}:${line}:${column}",
-  label: "Antigravity",
+  url: "antigravity-ide://file/${projectPath}${filePath}:${line}:${column}",
+  label: "Antigravity IDE",
 },

Verification

1. pnpm build
2. Load apps/extension/build/production_chrome as unpacked in chrome://extensions/
3. Click a component → v1 (Antigravity IDE) opens.

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