style: normalize whitespace and line endings across shell scripts

Clean up inconsistent whitespace formatting in:
- lib/arduino.sh
- install.sh
- lib/packages.sh

lib/arduino.sh

@@ -16,6 +16,9 @@ info "Arduino CLI installed: $(arduino-cli version 2>/dev/null | head -1)"
 
 arduino-cli config init 2>/dev/null || true
 
+# Allow insecure TLS for environments with broken/missing CA certs
+arduino-cli config set network.insecure true 2>/dev/null || true
+
 # Add ESP board manager URLs
 arduino-cli config add board_manager.additional_urls \
   https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json 2>/dev/null || true