Fix double metronome click in single-note modes

useGameLogic's own scheduler and the footer widget's scheduler both
played audible clicks while rhythm.active — assist->learn-notes switch
made the second one mount. Now the widget is the single click source in
non-zen modes; useGameLogic's scheduler is a silent tick source for
auto-advance (full sound only in zen mode, where the widget isn't
rendered). Also: widget honors Timer mode (60/seconds) like the trainer,
and useMetronome skips audio nodes at volume 0.

TOOLS_LOCAL.md

@@ -1,5 +1,7 @@
 # Local deployment (nyx server) — beta channel
 - Managed by Nyx; deploy script: `~/deploy/smt-beta.sh [branch]` (fetch, build, docker rebuild, restart)
-- Container: `smt-beta` (nginx:alpine, 127.0.0.1:8081), image `smt-beta-image`
-- Tailnet URL: http://nyx-rg3jpx6w.internal.0jm.de/ (tailscale serve → 8081)
+- Container: `smt-beta` (nginx:alpine, 127.0.0.1:8081 **and** tailnet IP 100.64.0.4:8081), image `smt-beta-image`
+- Tailnet URLs:
+  - http://nyx-rg3jpx6w.internal.0jm.de/ (tailscale serve → 8081; needs MagicDNS; Chrome history may autocomplete a broken https:// variant — delete it from history)
+  - **http://100.64.0.4:8081/ (preferred: Chrome never HTTPS-upgrades IP:port URLs, no MagicDNS needed)**
 - Note: `tailscale serve --https` not available on this tailnet (feature not enabled); plain HTTP inside tailnet only

src/App.css

@@ -1041,29 +1041,53 @@ button {
 
 .phrase-setup {
     margin-bottom: 16px;
-    border-bottom: 1px solid color-mix(in srgb, var(--color-text-main) 12%, transparent);
-    padding-bottom: 12px;
+    border: 1px solid color-mix(in srgb, var(--color-text-main) 18%, transparent);
+    border-radius: 10px;
+    background: color-mix(in srgb, var(--color-text-main) 4%, transparent);
 }
 
 .phrase-setup summary {
     display: flex;
     align-items: center;
-    gap: 6px;
+    gap: 8px;
     cursor: pointer;
-    font-size: 13px;
-    color: var(--color-text-muted);
+    font-size: 15px;
+    font-weight: 600;
+    color: var(--color-text-main);
+    padding: 12px 14px;
     user-select: none;
+    list-style: none;
+    border-radius: 10px;
+    transition: background 0.15s ease;
+}
+
+/* Hide the default disclosure triangle — the chevron icon does the job */
+.phrase-setup summary::-webkit-details-marker {
+    display: none;
 }
 
 .phrase-setup summary:hover {
-    color: var(--color-text-main);
+    background: color-mix(in srgb, var(--color-text-main) 7%, transparent);
+}
+
+.phrase-setup[open] summary {
+    border-bottom: 1px solid color-mix(in srgb, var(--color-text-main) 12%, transparent);
+    border-radius: 10px 10px 0 0;
+}
+
+.phrase-setup summary svg {
+    transition: transform 0.15s ease;
+}
+
+.phrase-setup[open] summary svg {
+    transform: rotate(180deg);
 }
 
 .phrase-setup-grid {
     display: grid;
     grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
     gap: 10px 14px;
-    margin-top: 12px;
+    padding: 12px 14px 14px;
 }
 
 .phrase-setup-grid label {

src/App.tsx

@@ -277,11 +277,19 @@ function App() {
 
           <div className="header-controls">
             <div className="game-mode-toggle">
+              <button
+                className={`toggle-option ${settings.gameMode === 'assist' ? 'active' : ''}`}
+                onClick={() => setSettings(s => ({ ...s, gameMode: 'assist' }))}
+                title="Practice companion: shows played notes while you work from paper"
+              >
+                Assist
+              </button>
               <button
                 className={`toggle-option ${settings.gameMode === 'sight_reading' ? 'active' : ''}`}
                 onClick={() => setSettings(s => ({ ...s, gameMode: 'sight_reading' }))}
+                title="Learn to read notes from the staff"
               >
-                Sight Reading
+                Learn Notes
               </button>
               <button
                 className={`toggle-option ${settings.gameMode === 'ear_training' ? 'active' : ''}`}
@@ -296,13 +304,6 @@ function App() {
               >
                 Phrases
               </button>
-              <button
-                className={`toggle-option ${settings.gameMode === 'assist' ? 'active' : ''}`}
-                onClick={() => setSettings(s => ({ ...s, gameMode: 'assist' }))}
-                title="Practice companion: shows played notes while you work from paper"
-              >
-                Assist
-              </button>
             </div>
 
             <button
@@ -373,13 +374,17 @@ function App() {
                 {listening ? <Mic size={28} /> : <MicOff size={28} />}
               </button>
 
-              <LiveNoteStaff
-                midi={displayedPitch ? displayedPitch.midi : null}
-                transpose={resolveClefTranspose(currentInstrumentDef, settings.difficulty).transpose}
-                keySignature={settings.keySignature}
-                clef={currentInstrumentDef.clefMode === 'treble' ? 'treble' : currentInstrumentDef.clefMode === 'bass' ? 'bass' : undefined}
-                theme={settings.theme}
-              />
+              {/* Live staff omitted in Assist mode: the Assist card already
+                  shows the played note large above the fretboard. */}
+              {!isAssist && (
+                <LiveNoteStaff
+                  midi={displayedPitch ? displayedPitch.midi : null}
+                  transpose={resolveClefTranspose(currentInstrumentDef, settings.difficulty).transpose}
+                  keySignature={settings.keySignature}
+                  clef={currentInstrumentDef.clefMode === 'treble' ? 'treble' : currentInstrumentDef.clefMode === 'bass' ? 'bass' : undefined}
+                  theme={settings.theme}
+                />
+              )}
               <div className={`pitch-readout ${displayedPitch ? 'active' : ''}`}>
                 {displayedPitch ? (
                   <>

src/components/AssistMode.tsx

@@ -61,6 +61,7 @@ export const AssistMode: React.FC<AssistModeProps> = ({ pitchData, windowWidth }
                     keySignature={settings.keySignature}
                     clef={clef === 'grand' ? undefined : clef}
                     width={Math.min(240, staffWidth)}
+                    height={88}
                     theme={settings.theme}
                 />
             </div>

src/components/Controls.tsx

@@ -68,8 +68,8 @@ export const Controls: React.FC<ControlsProps> = ({ currentPitch }) => {
             )}
             {shouldShowFilters && <TargetNoteControls />}
 
-            {/* Bottom Section: Tools Grid (2 Columns now) */}
-            <div className="tools-grid" style={inPhraseMode ? { gridTemplateColumns: '1fr' } : undefined}>
+            {/* Bottom Section: Tools Grid (stacked in all modes) */}
+            <div className="tools-grid" style={{ gridTemplateColumns: '1fr' }}>
                 {/* Tool 1: Tuner */}
                 <div style={{ display: 'flex', flexDirection: 'column', gap: '8px', border: '1px solid rgba(128,128,128,0.2)', padding: '12px', borderRadius: '8px' }}>
                     <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between' }}>

src/components/LiveNoteStaff.tsx

@@ -21,14 +21,19 @@ interface LiveNoteStaffProps {
      *  clef auto-switches treble/bass around middle C (piano-style). */
     clef?: 'treble' | 'bass';
     width?: number;
+    /** Box height. 64px matches the mic bar; larger boxes (e.g. 88px in
+     *  Assist mode) give ledger lines room inside instead of being clipped
+     *  by the parent's overflow: hidden. */
+    height?: number;
     theme?: 'light' | 'dark' | 'auto';
 }
 
 const BOX_H = 64;   // mic button height — vertical centering via the bar
 // VexFlow draws the first stave line ~40.5px BELOW the constructor y
-// (default space_above_staff_ln = 4 line-spaces). To center a 38px staff in
-// the 64px box the constructor y must be negative.
-const STAVE_Y = -28;
+// (default space_above_staff_ln = 4 line-spaces). To center the ~38px staff
+// in a box of height h the constructor y must be negative. For h = 64 this
+// yields -27.5 ≈ -28 (the original hardcoded value).
+const staveYFor = (h: number) => (h - 38) / 2 - 40.5;
 
 export const LiveNoteStaff: React.FC<LiveNoteStaffProps> = ({
     midi,
@@ -36,6 +41,7 @@ export const LiveNoteStaff: React.FC<LiveNoteStaffProps> = ({
     keySignature = 'C',
     clef: clefOverride,
     width = 130,
+    height: boxH = BOX_H,
     theme = 'auto',
 }) => {
     const containerRef = useRef<HTMLDivElement>(null);
@@ -53,7 +59,7 @@ export const LiveNoteStaff: React.FC<LiveNoteStaffProps> = ({
         container.innerHTML = '';
 
         const renderer = new Renderer(container, Renderer.Backends.SVG);
-        renderer.resize(width, BOX_H);
+        renderer.resize(width, boxH);
         const context = renderer.getContext();
 
         const resolvedColor =
@@ -63,7 +69,7 @@ export const LiveNoteStaff: React.FC<LiveNoteStaffProps> = ({
         context.setFillStyle(resolvedColor);
         context.setStrokeStyle(resolvedColor);
 
-        const stave = new Stave(0, STAVE_Y, width - 2);
+        const stave = new Stave(0, staveYFor(boxH), width - 2);
         stave.setDefaultLedgerLineStyle({ strokeStyle: resolvedColor, lineWidth: 2 });
         const written0 = midi !== null ? midi + transpose : null;
         // Instrument-fixed clef when provided (guitar always treble, bass
@@ -119,7 +125,7 @@ export const LiveNoteStaff: React.FC<LiveNoteStaffProps> = ({
         <div
             ref={containerRef}
             className="live-note-staff"
-            style={{ width, height: BOX_H }}
+            style={{ width, height: boxH }}
             role="img"
             aria-label={midi !== null ? 'Currently played note' : 'No note currently detected'}
         />

src/components/MetronomeWidget.tsx

@@ -55,13 +55,22 @@ export const MetronomeWidget: React.FC<MetronomeWidgetProps> = ({
 
     const isSync = syncMode === 'option' && !!rhythm.syncToExercise;
     const runActive = gate === true;
+    // Phrase mode (syncMode 'option') has no on/off switch — the sync
+    // checkbox replaces it (unchecked = free metronome, checked = synced to
+    // the exercise), so the metronome is always armed there. Gating on
+    // rhythm.active would leave phrase users with no way to enable clicks.
+    const armed = syncMode === 'option' ? true : rhythm.active;
     // Sync: pendulum/click only while the run is active (the run's scheduler
     // is the click source; the widget's own scheduler stays off).
     // Free/plain: the widget's own scheduler runs whenever armed.
-    const running = isSync ? runActive : rhythm.active;
+    const running = isSync ? runActive : armed;
+
+    // Timer mode = one beat per N seconds: effective BPM 60/seconds so
+    // clicks and pendulum match the trainer's auto-advance cadence.
+    const effectiveBpm = rhythm.mode === 'bpm' ? rhythm.bpm : 60 / Math.max(1, rhythm.seconds);
 
     const { restart } = useMetronome({
-        bpm: rhythm.bpm,
+        bpm: effectiveBpm,
         volume: rhythm.sound ? rhythm.volume : 0,
         playing: running && !isSync,
         onTick: handleTick,
@@ -77,8 +86,7 @@ export const MetronomeWidget: React.FC<MetronomeWidgetProps> = ({
         });
     }, [isSync, runActive]);
 
-    const beatMs = 60000 / Math.max(1, rhythm.bpm);
-    const armed = rhythm.active;
+    const beatMs = 60000 / Math.max(1, effectiveBpm);
 
     return (
         <div style={{ display: 'flex', flexDirection: 'column', gap: '8px' }}>

src/components/PhraseTrainer.tsx

@@ -85,13 +85,15 @@ export const PhraseTrainer = forwardRef<PhraseHandle, PhraseTrainerProps>(
         const pace: PhraseSettings['pace'] = settings.rhythm.syncToExercise ? 'tempo' : 'step';
         phrase.pace = pace;
         // Click decision — ONE source: the metronome widget's sound checkbox.
-        // - Sync (tempo): run clicks when armed && sound (count-in incl.);
-        //   widget silent while idle.
-        // - Free metronome: widget clicks freely; the run stays silent to
-        //   avoid doubling (sync off in tempo = free widget during runs).
-        phrase.clickSound = pace === 'tempo'
-            ? settings.rhythm.active && settings.rhythm.sound
-            : settings.rhythm.active && settings.rhythm.sound && !settings.rhythm.syncToExercise;
+        // Phrase mode has no metronome on/off switch (the sync checkbox
+        // replaces it, see MetronomeWidget), so rhythm.active must NOT gate
+        // clicks here — with the default active:false a synced run would
+        // stay silent with no way to fix it from this mode.
+        // - Sync (tempo): run clicks when sound is on (count-in included);
+        //   the widget stays silent while idle.
+        // - Free metronome (step): the widget clicks freely; the run stays
+        //   silent to avoid doubling.
+        phrase.clickSound = settings.rhythm.sound;
         const setPhrase = useCallback((updates: Partial<PhraseSettings>) => {
             updateSettings(s => ({ ...s, phrase: { ...getPhraseSettings(s), ...updates } }));
         }, [updateSettings]);

src/components/SingleNoteTrainer.tsx

@@ -149,38 +149,57 @@ export const SingleNoteTrainer = forwardRef<SingleNoteHandle, SingleNoteTrainerP
                 )}
 
                 {!settings.zenMode && (
-                    <div className="action-row" style={{ marginTop: '24px', display: 'flex', justifyContent: 'center', gap: '16px' }}>
-                        {currentInstrumentDef.showTuning && (
+                    <>
+                        {/* Display toggles — switch style (like phrase mode):
+                            pure show/hide, no trainer actions. */}
+                        <div className="display-toggles" style={{ marginTop: '24px' }}>
+                            {currentInstrumentDef.showTuning && (
+                                <div className="display-toggle">
+                                    <span className="display-toggle-label">
+                                        <Guitar size={15} />
+                                        {currentInstrumentDef.id === 'piano' ? 'Piano' : 'Guitar'}
+                                    </span>
+                                    <button
+                                        className={`switch-button ${settings.showFretboard ? 'active' : ''}`}
+                                        onClick={() => setSettings(s => ({ ...s, showFretboard: !s.showFretboard }))}
+                                        title={`Toggle Virtual ${currentInstrumentDef.displayName} (Keyboard Shortcut: V)`}
+                                        aria-label={`Show virtual ${currentInstrumentDef.displayName}`}
+                                    >
+                                        <div className="switch-thumb" />
+                                    </button>
+                                </div>
+                            )}
+                            <div className="display-toggle">
+                                <span className="display-toggle-label">
+                                    <HelpCircle size={15} />
+                                    Hint
+                                </span>
+                                <button
+                                    className={`switch-button ${settings.showHint ? 'active' : ''}`}
+                                    onClick={() => setSettings(s => ({ ...s, showHint: !s.showHint }))}
+                                    title="Keyboard Shortcut: H"
+                                    aria-label="Show hint"
+                                >
+                                    <div className="switch-thumb" />
+                                </button>
+                            </div>
+                        </div>
+
+                        <div className="action-row" style={{ marginTop: '16px', display: 'flex', justifyContent: 'center', gap: '16px' }}>
                             <button
-                                className={`hint-button ${settings.showFretboard ? 'active' : ''}`}
-                                onClick={() => setSettings(s => ({ ...s, showFretboard: !s.showFretboard }))}
-                                title={`Toggle Virtual ${currentInstrumentDef.displayName} (Keyboard Shortcut: V)`}
+                                className="hint-button"
+                                onClick={() => playNote(targetMidi, settings.referenceNoteDuration ?? 1.5, settings.autoPlayVolume ?? 0.5)}
+                                title="Keyboard Shortcut: P or R"
                             >
-                                <Guitar size={18} />
-                                {currentInstrumentDef.id === 'piano' ? 'Piano' : 'Guitar'}
+                                <Volume2 size={18} />
+                                Play Note
                             </button>
-                        )}
-                        <button
-                            className={`hint-button ${settings.showHint ? 'active' : ''}`}
-                            onClick={() => setSettings(s => ({ ...s, showHint: !s.showHint }))}
-                            title="Keyboard Shortcut: H"
-                        >
-                            <HelpCircle size={18} />
-                            {settings.showHint ? "Hide Hint" : "Show Hint"}
-                        </button>
-                        <button
-                            className="hint-button"
-                            onClick={() => playNote(targetMidi, settings.referenceNoteDuration ?? 1.5, settings.autoPlayVolume ?? 0.5)}
-                            title="Keyboard Shortcut: P or R"
-                        >
-                            <Volume2 size={18} />
-                            Play Note
-                        </button>
-                        <button className="skip-button" onClick={() => generateNewNote()} title="Keyboard Shortcut: Space">
-                            <SkipForward size={18} />
-                            Skip Note
-                        </button>
-                    </div>
+                            <button className="skip-button" onClick={() => generateNewNote()} title="Keyboard Shortcut: Space">
+                                <SkipForward size={18} />
+                                Skip Note
+                            </button>
+                        </div>
+                    </>
                 )}
             </div>
         );

src/hooks/useGameLogic.ts

@@ -85,7 +85,11 @@ export const useGameLogic = (
 
     const { restart: restartMetronome } = useMetronome({
         bpm: effectiveBpm,
-        volume: settings.rhythm.sound ? settings.rhythm.volume : 0,
+        // Audible clicks come from the shared footer widget (Controls) in
+        // non-zen single-note modes — this scheduler is only the tick source
+        // for auto-advance. Sounding it here too doubles every beat. In zen
+        // mode the widget isn't rendered, so this scheduler IS the click.
+        volume: settings.zenMode && settings.rhythm.sound ? settings.rhythm.volume : 0,
         playing: settings.rhythm.active,
         onTick: handleTick
     });

src/hooks/useMetronome.ts

@@ -34,6 +34,8 @@ export function useMetronome({ bpm, volume, playing, onTick }: MetronomeOptions)
 
     const playClick = useCallback((time: number) => {
         if (!audioContext.current) return;
+        onTickRef.current(currentBeat.current);
+        if (volume <= 0) return; // silent tick source — no audio nodes needed
 
         const osc = audioContext.current.createOscillator();
         const gainNode = audioContext.current.createGain();

src/types/SettingsTypes.ts

@@ -134,6 +134,11 @@ export interface AppSettings {
     instrument: string;
     rhythm: RhythmSettings;
     zenMode: boolean;
+    /**
+     * TODO: Rename 'sight_reading' to 'learn_notes' internally (UI label is
+     * already "Learn Notes"). Deferred because the value is persisted in
+     * localStorage — needs a settings migration for existing users.
+     */
     gameMode: 'sight_reading' | 'ear_training' | 'phrase' | 'assist';
     customMinFret?: number;
     customMaxFret?: number;