spaces: a room carries what its members are playing, sealed in the window its chat already uses

src/components/PlayerBar.svelte

@@ -367,6 +367,45 @@
         void api.smtcMetadata(title, artist, album, art);
     });
 
+    /* A listen for any Space that asked for one (src-tauri/src/spaces.rs —
+       which rooms hear it is that side's business, since the ledger knows and
+       this bar does not). Reported from here for the same reason the OS card
+       is: `metaParts` is where a track's artist and album are reconciled, and
+       deriving them a second time would be a second set of rules.
+
+       Once per track, and only after it has actually been LISTENED to — 30s,
+       or halfway for anything shorter. A skip says nothing about taste, and
+       the Space's window is shared with its chat, so a room that posted every
+       press would push its own conversation out inside a day. */
+    const LISTEN_AFTER = 30;
+    let listened = "";
+    $effect(() => {
+        const title = player.track?.title ?? "";
+        const pos = player.position ?? 0;
+        if (!title) return;
+        const [artist, album] = metaParts;
+        // The track, not the render. Coming back to a song after playing
+        // something else changes this key twice, so it reports again — while
+        // seeking around inside one play never does. This lives in memory, so
+        // a reload with something already past the threshold reports it again;
+        // the repeat is dropped on the other side, which is the only place
+        // that knows what was last said in each room.
+        const key = `${player.track?.path ?? ""}|${title}|${artist}`;
+        if (key === listened) return;
+        const enough = Math.min(LISTEN_AFTER, (player.duration ?? LISTEN_AFTER * 2) / 2);
+        if (pos < enough) return;
+        listened = key;
+        void api
+            // No catalog id: `player.track` carries what the bar needs to draw
+            // itself and nothing more. Artist and title are what a listen is
+            // found by anyway, the same pair `slsk_hint` carries.
+            .spaceReportListen(title, artist, album, player.duration ? Math.round(player.duration) : null, null)
+            .catch(() => {
+                // A Space that cannot be posted to is not this bar's problem;
+                // the backend already logged which one and why.
+            });
+    });
+
     // Waveform canvas + hover state.
     let waveWrap = $state(null);
     let waveCanvas = $state(null);