refactor: Refactor plot_spectra function in app.py for improved readability and performance

app.py

@@ -99,7 +99,7 @@ def send_and_receive(client, command_topic, msg, queue_timeout=60):
         return sensor_data
 
 
-# Function to plot spectra
+# helper function to plot discrete spectral sensor data
 def plot_spectra(sensor_data):
     """https://chatgpt.com/share/210d2fee-ca64-45a5-866e-e6df6e56bd1c"""
     wavelengths = np.array([410, 440, 470, 510, 550, 583, 620, 670])
@@ -155,7 +155,7 @@ def plot_spectra(sensor_data):
     ax.set_ylabel("Intensity")
     ax.set_title("Spectral Intensity vs. Wavelength")
 
-    plt.show()
+    st.pyplot(fig)
 
 
 # Publish button