UX: always-show set list (remove hide toggle), add practice timers, '+' add button

- Removed the set-list show/hide toggle and the R shortcut / Esc-close / close ✕.
  The panel is always visible: sticky side column on desktop, stacked below the
  metronome on mobile. Theme/help buttons stay right-justified.
- Added practice timers in the gap/ramp area: an Elapsed (count-up) timer and an
  adjustable Countdown (minutes; 0 = off), each with a reset. Both advance only
  while the metronome runs; countdown reaching 0 stops it (turns amber under 10s).
- '+ Add meter' button is now just '+'.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

index.html

@@ -115,17 +115,16 @@
   .log-head { font-weight:600; font-size:13px; margin-bottom:3px; }
   .log-seg { font-size:12px; color:var(--muted); margin:2px 0 0 12px; font-family:"Courier New",monospace; }
   .practice { border-top:1px solid var(--edge); margin-top:16px; padding-top:4px; }
-  #routineToggle { background:#2c3a4d; border-color:#3b5168; color:#cfe3ff; font-weight:600; }
-  /* docked side panel: pushes the metronome (no overlap); sticky so it stays in view */
-  #routineTray { display:none; flex:0 0 340px; align-self:flex-start; position:sticky; top:18px;
+  /* set-list panel: always shown — sticky beside the metronome on desktop,
+     stacks below it on narrow screens */
+  #routineTray { flex:0 0 340px; align-self:flex-start; position:sticky; top:18px;
     max-height:calc(100vh - 36px); overflow:auto; background:linear-gradient(180deg, var(--panel), var(--bg));
     border:1px solid var(--edge); border-radius:14px; padding:16px; box-shadow:0 10px 30px rgba(0,0,0,.25); }
-  #routineTray.open { display:block; }
-  /* narrow screens: fall back to an overlay drawer */
+  .tval { font-family:"Courier New",monospace; font-size:13px; color:var(--hot); min-width:42px; }
+  .tval.low { color:#ffb454; }
   @media (max-width: 820px) {
     #app { display:block; }
-    #routineTray { position:fixed; top:0; right:0; height:100%; max-height:none; width:min(360px,92vw);
-      border-radius:0; border:none; border-left:1px solid var(--edge); box-shadow:-12px 0 40px rgba(0,0,0,.45); z-index:60; }
+    #routineTray { position:static; max-height:none; width:auto; margin-top:18px; }
   }
   .tray-head { display:flex; align-items:center; justify-content:space-between; margin-bottom:14px; }
   .practice-col { border-left:1px solid var(--edge); padding-left:18px; }
@@ -170,8 +169,7 @@
   <div class="row" style="align-items:baseline; justify-content:space-between; gap:14px; margin-bottom:12px">
     <h1 style="margin:0">Stackable Metronome <span class="lane-meta" id="appVersion" title="build version">v0.0.1-dev</span></h1>
     <div style="display:flex; align-items:center; gap:10px">
-      <span class="kbd-legend">Space play · T tap · ↑↓ tempo (⇧×10) · A add · R set&nbsp;lists · N next · ? help</span>
-      <button id="routineToggle" title="show / hide set lists (R)">☰ Set Lists</button>
+      <span class="kbd-legend">Space play · T tap · ↑↓ tempo (⇧×10) · A add · N next · ? help</span>
       <button id="themeBtn" title="toggle light / dark theme">☀</button>
       <button id="helpBtn" title="keyboard shortcuts (?)">?</button>
     </div>
@@ -212,6 +210,17 @@
             <label style="font-size:12px" title="negative ramps down, positive ramps up"><input type="number" class="num" id="rampAmt" min="-30" max="30" value="5"> BPM</label>
             <label style="font-size:12px">every <input type="number" class="num" id="rampEvery" min="1" max="16" value="4"> bars</label>
           </div>
+          <div class="checkrow" style="margin:12px 0 6px; gap:8px"><b style="font-size:11px; text-transform:uppercase; letter-spacing:1px; color:var(--muted)">Timers</b><span class="hint" style="margin:0">run while playing</span></div>
+          <div class="row" style="gap:10px; align-items:center">
+            <label style="font-size:12px">Elapsed</label>
+            <span class="tval" id="elapsedVal">0:00</span>
+            <button class="iconbtn" id="elapsedReset" title="reset elapsed timer">⟲</button>
+          </div>
+          <div class="row" style="gap:10px; align-items:center; margin-top:6px">
+            <label style="font-size:12px" title="0 = no countdown">Countdown <input type="number" class="num" id="countMin" min="0" max="120" value="5"> min</label>
+            <span class="tval" id="countVal">5:00</span>
+            <button class="iconbtn" id="countReset" title="reset countdown">⟲</button>
+          </div>
         </div>
       </div>
     </div>
@@ -222,7 +231,7 @@
     <span class="hint" style="margin:0; flex:1">Click a beat pad to toggle it (rest) — e.g. snare on 2 &amp; 4</span>
   </div>
   <div id="meters"></div>
-  <div style="margin-top:10px"><button class="add" id="addMeterBtn">+ Add meter</button></div>
+  <div style="margin-top:10px"><button class="add" id="addMeterBtn" title="add meter lane (A)">+</button></div>
 
   <!-- (presets moved into the Transport card; set lists live in the slide-out tray;
         status now shows under the BPM in the display) -->
@@ -234,7 +243,6 @@
     <h2 style="margin:0">Set Lists</h2>
     <div style="display:flex; gap:6px; position:relative">
       <button class="x" id="trayMenuBtn" title="log &amp; backup" style="margin-left:0">⋯</button>
-      <button class="x" id="routineClose" title="close" style="margin-left:0">✕</button>
       <div id="trayMenu" class="menu" hidden>
         <button id="shareSettingsBtn">🔗 Share settings link</button>
         <button id="shareSetlistBtn">🔗 Share set-list link</button>
@@ -277,7 +285,6 @@
       <tr><td><kbd>↑</kbd> <kbd>↓</kbd></td><td>Tempo ±1 BPM</td></tr>
       <tr><td><kbd>⇧↑</kbd> <kbd>⇧↓</kbd></td><td>Tempo ±10 BPM</td></tr>
       <tr><td><kbd>A</kbd></td><td>Add meter lane</td></tr>
-      <tr><td><kbd>R</kbd></td><td>Set lists tray</td></tr>
       <tr><td><kbd>N</kbd></td><td>Load next set-list item</td></tr>
       <tr><td><kbd>⌥↑</kbd> <kbd>⌥↓</kbd></td><td>Reorder selected item</td></tr>
       <tr><td><kbd>1</kbd>–<kbd>9</kbd></td><td>Mute lane 1–9</td></tr>
@@ -936,9 +943,35 @@ function drawLoop() {
     updateStatus(now);
   }
   for (const m of meters) renderLaneStrip(m);
+  tickTimers();
   requestAnimationFrame(drawLoop);
 }
 
+/* =========================================================================
+   PRACTICE TIMERS — advance only while the metronome is running
+   ========================================================================= */
+const timers = { elapsedMs: 0, totalMs: 5 * 60000, remainingMs: 5 * 60000, last: 0 };
+function fmtClock(ms) { const s = Math.max(0, Math.round(ms / 1000)); return Math.floor(s / 60) + ":" + String(s % 60).padStart(2, "0"); }
+function tickTimers() {
+  const now = Date.now();
+  const dt = timers.last ? Math.min(now - timers.last, 1000) : 0;   // clamp so backgrounded gaps don't jump
+  timers.last = now;
+  if (state.running) {
+    timers.elapsedMs += dt;
+    if (timers.totalMs > 0) {
+      timers.remainingMs -= dt;
+      if (timers.remainingMs <= 0) { timers.remainingMs = 0; if (state.running) toggleTransport(); }   // time's up → stop
+    }
+  }
+  renderTimers();
+}
+function renderTimers() {
+  $("elapsedVal").textContent = fmtClock(timers.elapsedMs);
+  const cd = $("countVal");
+  if (timers.totalMs <= 0) { cd.textContent = "off"; cd.classList.remove("low"); }
+  else { cd.textContent = fmtClock(timers.remainingMs); cd.classList.toggle("low", state.running && timers.remainingMs <= 10000); }
+}
+
 // Status shows in the display, under the BPM. Stopped → meter count; running →
 // bar + trainer/ramp flags (kept short for the narrow display column).
 function updateStatus() {
@@ -1004,8 +1037,9 @@ $("rampStart").addEventListener("input", (e) => ramp.startBpm = +e.target.value)
 $("rampAmt").addEventListener("input", (e) => ramp.amount = +e.target.value);
 $("rampEvery").addEventListener("input", (e) => ramp.everyBars = +e.target.value);
 $("addMeterBtn").addEventListener("click", () => addMeter("4", 1, "claves"));
-$("routineToggle").addEventListener("click", () => $("routineTray").classList.toggle("open"));
-$("routineClose").addEventListener("click", () => $("routineTray").classList.remove("open"));
+$("countMin").addEventListener("input", (e) => { timers.totalMs = (+e.target.value || 0) * 60000; timers.remainingMs = timers.totalMs; renderTimers(); });
+$("elapsedReset").addEventListener("click", () => { timers.elapsedMs = 0; renderTimers(); });
+$("countReset").addEventListener("click", () => { timers.remainingMs = timers.totalMs; renderTimers(); });
 $("trayMenuBtn").addEventListener("click", (e) => { e.stopPropagation(); $("trayMenu").hidden = !$("trayMenu").hidden; });
 document.addEventListener("click", (e) => { const m = $("trayMenu"); if (m && !m.hidden && !m.contains(e.target) && e.target.id !== "trayMenuBtn") m.hidden = true; });
 $("newSetlistBtn").addEventListener("click", newSetlist);
@@ -1039,10 +1073,9 @@ window.addEventListener("keydown", (e) => {
   else if (k === "ArrowUp") { e.preventDefault(); setBpm(state.bpm + (e.shiftKey ? 10 : 1)); }
   else if (k === "ArrowDown") { e.preventDefault(); setBpm(state.bpm - (e.shiftKey ? 10 : 1)); }
   else if (k === "a" || k === "A") { addMeter("4", 1, "claves"); }
-  else if (k === "r" || k === "R") { $("routineTray").classList.toggle("open"); }
   else if (k === "n" || k === "N") { nextItem(); }
   else if (k === "?") { toggleShortcuts(true); }
-  else if (k === "Escape") { if (!$("shareOverlay").hidden) $("shareOverlay").hidden = true; else if (!$("shortcutsOverlay").hidden) toggleShortcuts(false); else $("routineTray").classList.remove("open"); }
+  else if (k === "Escape") { if (!$("shareOverlay").hidden) $("shareOverlay").hidden = true; else if (!$("shortcutsOverlay").hidden) toggleShortcuts(false); }
   else if (k >= "1" && k <= "9") {
     const m = meters[+k - 1];
     if (m) { m.mute = !m.mute; const cb = m.el.querySelector(`#m${m.id}_mute`); if (cb) cb.checked = m.mute; }
@@ -1067,7 +1100,6 @@ renderSetlists();
 renderLog();
 updateCtx();
 $("appVersion").textContent = "v" + APP_VERSION;
-if (window.innerWidth > 820) $("routineTray").classList.add("open");  // docked-open on desktop, closed on mobile
 requestAnimationFrame(drawLoop);
 </script>
 </body>