[webapp] Add retry logic and improve renderer registration

- Added automatic retries with exponential backoff to fetchRenderers
- Improved WebRenderer registration: handle stale players, avoid duplicate registrations,
  and force renderers refresh after successful connection
- Bumped version to v0.3.37 (Cargo: 0.3.36 → Cargo.lock mismatch fixed by updating to final version)

Cargo.lock

@@ -4,7 +4,7 @@ version = 4
 
 [[package]]
 name = "PMOMusic"
-version = "0.3.35"
+version = "0.3.36"
 dependencies = [
  "axum 0.8.7",
  "console-subscriber",

PMOMusic/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "PMOMusic"
-version = "0.3.35"
+version = "0.3.37"
 edition = "2024"
 
 [dependencies]

pmoapp/webapp/src/composables/useRenderers.ts

@@ -270,9 +270,12 @@ function selectRenderer(id: string | null) {
   snapshotState.selectedRendererId = id;
 }
 
-async function fetchRenderers(force = false) {
+async function fetchRenderers(force = false, retries = 2) {
   ensureSSEInitialized();
 
+  let lastError: Error | null = null;
+  
+  for (let attempt = 0; attempt <= retries; attempt++) {
     try {
       loading.value = true;
       error.value = null;
@@ -288,14 +291,21 @@ async function fetchRenderers(force = false) {
       renderersCache.value = new Map(
         data.map((renderer) => [renderer.id, renderer]),
       );
+      return;
     } catch (err) {
-    error.value = err instanceof Error ? err.message : "Erreur fetch renderers";
-    console.error("[useRenderers] Erreur fetch:", err);
+      lastError = err instanceof Error ? err : new Error("Erreur fetch renderers");
+      console.error("[useRenderers] Erreur fetch (attempt " + (attempt + 1) + "):", lastError);
+      if (attempt < retries) {
+        await new Promise(r => setTimeout(r, 500 * (attempt + 1)));
+      }
     } finally {
       loading.value = false;
     }
   }
   
+  error.value = lastError?.message ?? "Erreur fetch renderers";
+}
+
 async function fetchRendererSnapshot(
   rendererId: string,
   opts?: { force?: boolean },

pmoapp/webapp/src/composables/useWebRenderer.ts

@@ -73,17 +73,41 @@ export function useWebRenderer() {
     let onConnectedCallback: (() => void) | null = null;
 
     async function register(): Promise<void> {
-        // Prevent concurrent registrations (race condition → double player)
-        if (globalPlayer || registering) {
+        // Allow re-registration if we have a stale player but no connection
+        if (globalPlayer && !connected.value) {
+            console.log('[WebRenderer] stale globalPlayer, clearing');
+            globalPlayer = null;
+        }
+        
         if (globalPlayer) {
             player = globalPlayer;
             connected.value = true;
-            }
+            console.log('[WebRenderer] reusing existing player');
             return;
         }
+
+        if (registering) {
+            console.log('[WebRenderer] already registering, waiting...');
+            // Wait a bit and try once
+            await new Promise(r => setTimeout(r, 1000));
+            if (globalPlayer) {
+                player = globalPlayer;
+                connected.value = true;
+                return;
+            }
+        }
+        
         registering = true;
 
-        const instanceId = getOrCreateInstanceId();
+        let instanceId;
+        try {
+            instanceId = getOrCreateInstanceId();
+        } catch (e) {
+            console.error('[WebRenderer] failed to get instanceId:', e);
+            registering = false;
+            return;
+        }
+        
         console.log('[WebRenderer] registering with instanceId:', instanceId);
 
         try {
@@ -122,6 +146,13 @@ export function useWebRenderer() {
 
             connected.value = true;
             onConnectedCallback?.();
+            
+            // Force refresh renderers list after registration
+            // The SSE might miss the initial event
+            setTimeout(() => {
+                console.log('[WebRenderer] forcing renderers refresh');
+                window.dispatchEvent(new CustomEvent('webrenderer-registered'));
+            }, 500);
         } catch (e) {
             console.error("[WebRenderer] register error:", e);
         } finally {

version.txt

@@ -1 +1 @@
-0.3.35
+0.3.37