feat(session): add explicit leave and immediate slot release

test/web/test_player_app.js

@@ -103,6 +103,29 @@ test("latency correlation is bounded and only completes matching authoritative v
   assert.equal(tracker.pointerSnapshot().length, player.LATENCY_SAMPLE_LIMIT);
 });
 
+test("connection quality uses one correlated heartbeat and bounded local smoothing", () => {
+  let clock = 0;
+  const quality = new player.ConnectionQuality(() => clock);
+  assert.equal(quality.begin("heartbeat-1"), true);
+  assert.equal(quality.begin("heartbeat-2"), false);
+  clock = 85;
+  assert.equal(quality.acknowledge("wrong", 2), false);
+  assert.equal(quality.acknowledge("heartbeat-1", 2), true);
+  assert.deepEqual(quality.latest, {totalMs: 85, communicationMs: 83, handlingMs: 2, received: 85});
+  for (let index = 0; index < player.QUALITY_SAMPLE_LIMIT + 2; index++) {
+    clock += 10;
+    assert.equal(quality.begin(`heartbeat-${index + 2}`), true);
+    clock += 20;
+    assert.equal(quality.acknowledge(`heartbeat-${index + 2}`, 1), true);
+  }
+  assert.equal(quality.samples.length, player.QUALITY_SAMPLE_LIMIT);
+  assert.equal(quality.acknowledge("heartbeat-99", 1001), false);
+  clock += player.HEARTBEAT_STALE_MS + 1;
+  assert.equal(quality.status(), "stale");
+  quality.reset();
+  assert.equal(quality.status(), "unknown");
+});
+
 test("player map cells enlarge small projections without exceeding a readable bound", () => {
   const sevenBySeven = player.playerCellSize(396, 730, 7, 7);
   const fourByFour = player.playerCellSize(396, 730, 4, 4);
@@ -338,8 +361,9 @@ test("refresh contract restores only the token and waits for server projection",
   assert.equal("position" in restore.payload, false);
   assert.equal("inventory" in restore.payload, false);
   const script = fs.readFileSync(path.join(project, "web/player.js"), "utf8");
-  assert.equal((script.match(/localStorage\.setItem/g) || []).length, 1);
+  assert.equal((script.match(/localStorage\.setItem/g) || []).length, 2);
   assert.match(script, /localStorage\.setItem\(TOKEN_KEY, message\.payload\.token\)/);
+  assert.match(script, /localStorage\.setItem\(NAME_KEY, byId\("player-name"\)\.value\.slice\(0, 32\)\)/);
 });
 
 test("player assets are local, Russian, accessible, and responsive", () => {
@@ -392,6 +416,19 @@ test("one compact settings popover replaces standalone secondary controls", () =
   assert.match(script, /button\.textContent = reduced \? "Движение: выкл" : "Движение: вкл"/);
 });
 
+test("connection quality stays compact and exposes an honest response split", () => {
+  const html = fs.readFileSync(path.join(project, "web/index.html"), "utf8");
+  const css = fs.readFileSync(path.join(project, "web/player.css"), "utf8");
+  const script = fs.readFileSync(path.join(project, "web/player.js"), "utf8");
+  assert.match(html, /id="quality"[^>]*aria-label="Отклик неизвестен"/);
+  assert.match(html, /id="quality-details"/);
+  assert.match(css, /\.quality-pill \{[^}]*min-width: 48px/);
+  assert.match(script, /send\("heartbeat", \{\}, null\)/);
+  assert.match(script, /communicationMs: Math\.max\(0, smoothedMs - handlingMs\)/);
+  assert.match(script, /message\.payload\.command === "heartbeat"/);
+  assert.match(script, /documentObject\.hidden/);
+});
+
 test("reference-derived SVG gameplay symbols preserve local yellow and blue ownership", () => {
   const icons = fs.readFileSync(path.join(project, "web/icons.svg"), "utf8");
   const script = fs.readFileSync(path.join(project, "web/player.js"), "utf8");