fix(install): add error checking for binary move and chmod operations

- Check if mv command succeeds
- Verify binary exists after move
- Check if chmod succeeds
- Exit with error instead of continuing on failure

install.sh

@@ -216,9 +216,20 @@ fi
 BINARY_PATH="$INSTALL_DIR/nupst"
 mv "$TEMP_FILE" "$BINARY_PATH"
 
+if [ $? -ne 0 ] || [ ! -f "$BINARY_PATH" ]; then
+  echo "Error: Failed to move binary to $BINARY_PATH"
+  rm -f "$TEMP_FILE" 2>/dev/null
+  exit 1
+fi
+
 # Make executable
 chmod +x "$BINARY_PATH"
 
+if [ $? -ne 0 ]; then
+  echo "Error: Failed to make binary executable"
+  exit 1
+fi
+
 echo "Binary installed successfully to: $BINARY_PATH"
 echo ""