Add connection type indicator

[makermelissa-ai-assistant]

Summary

Adds a visible connection type indicator to the Connect/Disconnect control so users can see whether the current or last selected workflow is WiFi, Bluetooth, or USB.

Details

• Maps each workflow type to its existing Font Awesome icon and display label.
• Updates the header Connect/Disconnect buttons with the selected/remembered connection method, title text, and an accessible label.
• Keeps the mobile header compact by hiding the text label while preserving the icon.

Refs #22

Validation

• npm run build
• git diff --check
• Browser check of the built app for initial state, WiFi selected state, and mobile header overflow