Support remote project tabs with local OpenCode bridge

Keeps provider credentials local while executing OpenCode shell and file tools against the selected remote workspace over SSH.

test/test.theia-config.node.ts

@@ -8,7 +8,9 @@ tap.test('should keep Theia backend config under Git.Zone IDE home path', async
   const packageJsonPath = path.join(process.cwd(), 'applications', 'remote-theia', 'package.json');
   const packageJson = JSON.parse(await fs.readFile(packageJsonPath, 'utf8'));
 
+  expect(packageJson.theia.backend.config.singleInstance).toEqual(false);
   expect(packageJson.theia.backend.config.configurationFolder).toEqual('.git.zone/ide/theia');
+  expect(packageJson.theia.frontend.config.defaultTheme).toEqual('dark');
 });
 
 tap.test('should avoid legacy .theia workspace preference folders', async () => {