fix(ci): correct pnpm install directory in release workflow

Change pnpm install to run in the ui-react directory to properly
install frontend dependencies.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: tantara

.github/workflows/release-tauri.yml

@@ -67,7 +67,7 @@ jobs:
                   workspaces: "./src-tauri -> target"
 
             - name: Install frontend dependencies
-              run: pnpm install
+              run: cd ui-react && pnpm install
 
             - name: Setup optimized build config (if enabled)
               if: github.event.inputs.optimized == 'true' || startsWith(github.ref, 'refs/tags/')