fix: character encoding issues in shell command processor (#1949)

Co-authored-by: Jacob Richman <jacob314@gmail.com>
Co-authored-by: Sandy Tao <sandytao520@icloud.com>

packages/cli/src/ui/hooks/shellCommandProcessor.test.ts

@@ -19,9 +19,11 @@ vi.mock('os', () => ({
   default: {
     platform: () => 'linux',
     tmpdir: () => '/tmp',
+    homedir: () => '/home/user',
   },
   platform: () => 'linux',
   tmpdir: () => '/tmp',
+  homedir: () => '/home/user',
 }));
 vi.mock('@google/gemini-cli-core');
 vi.mock('../utils/textUtils.js', () => ({