fix(android): 8s Rust timeout on audio_start; always emit connect: debug events

- engine.rs: wrap spawn_blocking(audio_start) in an 8s tokio timeout so
  the connect command fails fast with a clear error if the Oboe HAL
  never returns, instead of blocking the JS 45s timer
- lib.rs: emit_call_debug now always forwards connect: and
  register_signal: steps to the JS overlay regardless of the debug-logs
  toggle — needed because app-data clears reset the toggle to false,
  making join failures invisible on first install
- main.ts: JS timeout bumped to 45s (Rust 8s fires first); timeout
  message now includes last native connect: step so the toast is
  actionable without opening the debug log

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

desktop/src-tauri/src/engine.rs

@@ -683,9 +683,10 @@ impl CallEngine {
             "connect:audio_start_start",
             serde_json::json!({ "t_ms": t_pre_audio }),
         );
-        let audio_start_result = tokio::task::spawn_blocking(crate::wzp_native::audio_start)
-            .await
-            .map_err(|e| {
+        let audio_start_task = tokio::task::spawn_blocking(crate::wzp_native::audio_start);
+        let audio_start_result =
+            match tokio::time::timeout(std::time::Duration::from_secs(8), audio_start_task).await {
+                Ok(join_result) => join_result.map_err(|e| {
                     crate::emit_call_debug(
                         &app,
                         "connect:audio_start_panic",
@@ -695,7 +696,19 @@ impl CallEngine {
                         }),
                     );
                     anyhow::anyhow!("audio_start task panic: {e}")
-            })?;
+                })?,
+                Err(_) => {
+                    crate::emit_call_debug(
+                        &app,
+                        "connect:audio_start_timeout",
+                        serde_json::json!({
+                            "t_ms": call_t0.elapsed().as_millis(),
+                            "timeout_ms": 8000,
+                        }),
+                    );
+                    return Err(anyhow::anyhow!("wzp_native_audio_start timed out after 8s"));
+                }
+            };
         if let Err(code) = audio_start_result {
             crate::emit_call_debug(
                 &app,

desktop/src-tauri/src/lib.rs

@@ -59,13 +59,15 @@ fn set_call_debug_logs_internal(on: bool) {
     CALL_DEBUG_LOGS.store(on, Ordering::Relaxed);
 }
 
-/// Emit a `call-debug-log` event to the JS side IF the flag is on.
+/// Emit a `call-debug-log` event to the JS side.
 /// Also mirrors to `tracing::info!` so logcat keeps its copy
-/// regardless of the flag — the toggle only controls the GUI
-/// overlay, not the underlying Android log stream.
+/// regardless of the flag. Connect/register steps are always emitted
+/// because they are needed to diagnose failed joins after app data is
+/// cleared and the GUI debug toggle is back to its default false value.
 pub(crate) fn emit_call_debug(app: &tauri::AppHandle, step: &str, details: serde_json::Value) {
     tracing::info!(step, ?details, "call-debug");
-    if !call_debug_logs_enabled() {
+    let force_emit = step.starts_with("connect:") || step.starts_with("register_signal:");
+    if !force_emit && !call_debug_logs_enabled() {
         return;
     }
     let payload = serde_json::json!({

desktop/src/main.ts

@@ -195,11 +195,24 @@ function errorMessage(e: unknown): string {
   return String(e);
 }
 
-function connectWithTimeout(args: Record<string, unknown>, timeoutMs = 15000) {
+function connectDebugSummary(entry: CallDebugEntry | null): string {
+  if (!entry) return "no native connect event received";
+  const details = entry.details && typeof entry.details === "object"
+    ? JSON.stringify(entry.details)
+    : String(entry.details ?? "");
+  return `${entry.step}${details ? ` ${details}` : ""}`;
+}
+
+let lastConnectDebug: CallDebugEntry | null = null;
+
+function connectWithTimeout(args: Record<string, unknown>, timeoutMs = 45000) {
+  lastConnectDebug = null;
   return Promise.race([
     invoke("connect", args),
     new Promise<never>((_, reject) =>
-      setTimeout(() => reject(new Error("connect timed out (15s) - check audio permissions")), timeoutMs)
+      setTimeout(() => reject(new Error(
+        `connect timed out (${Math.round(timeoutMs / 1000)}s); last native step: ${connectDebugSummary(lastConnectDebug)}`
+      )), timeoutMs)
     ),
   ]);
 }
@@ -221,6 +234,7 @@ const CALL_DEBUG_MAX = 200;
 listen("call-debug-log", (event: any) => {
   const entry: CallDebugEntry = event.payload;
   callDebugBuffer.push(entry);
+  if (entry.step?.startsWith("connect:")) lastConnectDebug = entry;
   if (callDebugBuffer.length > CALL_DEBUG_MAX) callDebugBuffer.shift();
   renderCallDebugLog();
 });