daemon: Add pause between NFC polling

CHANGELOG.md

@@ -5,6 +5,7 @@
 - daemon: Fix UI service failing to launch when started manually instead of via D-Bus activation.
 - daemon: Allow Firefox to contact daemon on more distros with different app IDs (Thank you, @michaelbeaumont!)
 - daemon: Fix all subsequent requests being rejected after the UI failed to launch.
+- daemon: Don't busy loop polling for NFC devices when NFC is enabled.
 - ui: Add Bulgarian translation (Thank you, @salif!)
 - webext: Try to read app ID from associated desktop entry (Thank you, @michaelbeaumont!)
 - ui: Basic recovery from failed attempts to use devices (e.g. flaky bluetooth)

credentialsd/src/credential_service/nfc.rs

@@ -48,6 +48,7 @@ impl InProcessNfcHandler {
         match result {
             Ok(Some(nfc_device)) => Ok(NfcStateInternal::Connected(nfc_device)),
             Ok(None) => {
+                tokio::time::sleep(Duration::from_millis(100)).await;
                 let state = NfcStateInternal::Waiting;
                 Ok(state)
             }