Split software arch desc for easier manintenance. Many fixes related to next video playing and remote playback

src/lib/stores/playbackMode.ts

@@ -255,10 +255,14 @@ function createPlaybackModeStore() {
   }
 
   /**
-   * Monitor remote session for disconnection
+   * Monitor remote session for disconnection with grace period.
+   * Requires multiple consecutive misses before declaring disconnection
+   * to tolerate transient network hiccups.
    */
   function initializeSessionMonitoring(): void {
-    // Subscribe to session changes
+    let consecutiveMisses = 0;
+    const DISCONNECT_THRESHOLD = 3; // ~6s at 2s polling interval
+
     selectedSession.subscribe((session) => {
       const currentState = get({ subscribe });
 
@@ -266,14 +270,28 @@ function createPlaybackModeStore() {
       // Don't interfere during an active transfer (we intentionally clear the session)
       if (currentState.mode === "remote" && currentState.remoteSessionId && !currentState.isTransferring) {
         if (!session || session.id !== currentState.remoteSessionId || !session.supportsMediaControl) {
-          console.warn("[PlaybackMode] Remote session lost or disconnected");
-          update((s) => ({
-            ...s,
-            mode: "idle",
-            remoteSessionId: null,
-            transferError: "Remote session disconnected",
-          }));
+          consecutiveMisses++;
+          console.warn(`[PlaybackMode] Remote session miss ${consecutiveMisses}/${DISCONNECT_THRESHOLD}`);
+
+          if (consecutiveMisses >= DISCONNECT_THRESHOLD) {
+            console.warn("[PlaybackMode] Remote session lost after sustained disconnection");
+            consecutiveMisses = 0;
+            update((s) => ({
+              ...s,
+              mode: "idle",
+              remoteSessionId: null,
+              transferError: "Remote session disconnected",
+            }));
+          }
+        } else {
+          // Session is healthy, reset counter
+          if (consecutiveMisses > 0) {
+            console.log("[PlaybackMode] Remote session recovered after", consecutiveMisses, "misses");
+          }
+          consecutiveMisses = 0;
         }
+      } else {
+        consecutiveMisses = 0;
       }
     });
   }