fix: blocking_lock panic in status(), fingerprint copy-to-clipboard

- Change status() from blocking_lock to async lock().await —
  fixes "Cannot block the current thread from within a runtime" panic
  that froze the call timer and broke audio
- Click fingerprint to copy to clipboard (both connect and settings screens)
- Show "Copied!" feedback on click

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

desktop/src-tauri/src/engine.rs

@@ -333,8 +333,8 @@ impl CallEngine {
         !was
     }
 
-    pub fn status(&self) -> EngineStatus {
+    pub async fn status(&self) -> EngineStatus {
-        let parts = self.participants.blocking_lock();
+        let parts = self.participants.lock().await;
         EngineStatus {
             mic_muted: self.mic_muted.load(Ordering::Relaxed),
             spk_muted: self.spk_muted.load(Ordering::Relaxed),

desktop/src-tauri/src/main.rs

@@ -108,7 +108,7 @@ async fn toggle_speaker(state: tauri::State<'_, Arc<AppState>>) -> Result<bool,
 async fn get_status(state: tauri::State<'_, Arc<AppState>>) -> Result<CallStatus, String> {
     let engine_lock = state.engine.lock().await;
     if let Some(ref engine) = *engine_lock {
-        let status = engine.status();
+        let status = engine.status().await;
         Ok(CallStatus {
             active: true,
             mic_muted: status.mic_muted,

desktop/src/main.ts

@@ -108,6 +108,29 @@ function renderRecentRooms(rooms: string[]) {
 
 applySettings();
 
+// Click fingerprint to copy
+myFingerprintEl.addEventListener("click", () => {
+  if (myFingerprint) {
+    navigator.clipboard.writeText(myFingerprint).then(() => {
+      const orig = myFingerprintEl.textContent;
+      myFingerprintEl.textContent = "Copied!";
+      setTimeout(() => { myFingerprintEl.textContent = orig; }, 1000);
+    });
+  }
+});
+myFingerprintEl.style.cursor = "pointer";
+
+sFingerprint.addEventListener("click", () => {
+  if (myFingerprint) {
+    navigator.clipboard.writeText(myFingerprint).then(() => {
+      const orig = sFingerprint.textContent;
+      sFingerprint.textContent = "Copied!";
+      setTimeout(() => { sFingerprint.textContent = orig; }, 1000);
+    });
+  }
+});
+sFingerprint.style.cursor = "pointer";
+
 // ── Connect ──
 connectBtn.addEventListener("click", doConnect);
 // Enter key to connect
@@ -277,6 +300,17 @@ listen("call-event", (event: any) => {
 });
 
 // ── Settings panel ──
+// Load fingerprint into settings when status is available
+async function refreshFingerprint() {
+  try {
+    const st: CallStatus = await invoke("get_status");
+    if (st.fingerprint) {
+      myFingerprint = st.fingerprint;
+      myFingerprintEl.textContent = `ID: ${st.fingerprint}`;
+    }
+  } catch {}
+}
+
 function openSettings() {
   const s = loadSettings();
   sRelay.value = s.relay;