feat(hotkeys): Spotify-parity playback actions

Eight Playback actions the table never had, on Spotify's desktop defaults:
volume up/down (Ctrl+Up/Down), mute (M), shuffle (Ctrl+S), repeat (Ctrl+R),
like (Alt+Shift+B), and a surface-independent seek (Ctrl+Shift+Left/Right).

Each reuses an existing transport seam, and the immersive bare-arrow seek
rows are untouched. Volume honours the player bars' volLocked predicate, so
the hotkey cannot move the slider on an ALSA-Direct hw path where the engine
documents the write as a no-op. Like rides a QML seam, as nav.search does,
because the track id is a QbzPlayer property rather than part of the Rust
now-playing model.

Two new tests; labels added to all eight catalogs.

crates/qbz-i18n/translations/de/LC_MESSAGES/qbz-ui.po

@@ -6036,3 +6036,29 @@ msgstr "Dieses Album enthält keine Titel."
 
 msgid "Reactive Rings"
 msgstr "Reaktive Ringe"
+
+# Hotkeys: the Spotify-parity playback actions
+
+msgid "Volume Up"
+msgstr "Lauter"
+
+msgid "Volume Down"
+msgstr "Leiser"
+
+msgid "Mute / Unmute"
+msgstr "Stumm / Ton an"
+
+msgid "Toggle Shuffle"
+msgstr "Zufallswiedergabe umschalten"
+
+msgid "Cycle Repeat"
+msgstr "Wiederholmodus wechseln"
+
+msgid "Like Track"
+msgstr "Titel liken"
+
+msgid "Seek Forward"
+msgstr "Vorspulen"
+
+msgid "Seek Back"
+msgstr "Zurückspulen"

crates/qbz-i18n/translations/en/LC_MESSAGES/qbz-ui.po

@@ -1641,3 +1641,29 @@ msgstr "This album has no tracks."
 
 msgid "Reactive Rings"
 msgstr "Reactive Rings"
+
+# Hotkeys: the Spotify-parity playback actions
+
+msgid "Volume Up"
+msgstr "Volume Up"
+
+msgid "Volume Down"
+msgstr "Volume Down"
+
+msgid "Mute / Unmute"
+msgstr "Mute / Unmute"
+
+msgid "Toggle Shuffle"
+msgstr "Toggle Shuffle"
+
+msgid "Cycle Repeat"
+msgstr "Cycle Repeat"
+
+msgid "Like Track"
+msgstr "Like Track"
+
+msgid "Seek Forward"
+msgstr "Seek Forward"
+
+msgid "Seek Back"
+msgstr "Seek Back"

crates/qbz-i18n/translations/es/LC_MESSAGES/qbz-ui.po

@@ -6042,3 +6042,29 @@ msgstr "Este álbum no tiene pistas."
 
 msgid "Reactive Rings"
 msgstr "Anillos reactivos"
+
+# Hotkeys: the Spotify-parity playback actions
+
+msgid "Volume Up"
+msgstr "Subir Volumen"
+
+msgid "Volume Down"
+msgstr "Bajar Volumen"
+
+msgid "Mute / Unmute"
+msgstr "Silenciar / Activar Sonido"
+
+msgid "Toggle Shuffle"
+msgstr "Alternar Aleatorio"
+
+msgid "Cycle Repeat"
+msgstr "Cambiar Repetición"
+
+msgid "Like Track"
+msgstr "Me Gusta"
+
+msgid "Seek Forward"
+msgstr "Avanzar"
+
+msgid "Seek Back"
+msgstr "Retroceder"

crates/qbz-i18n/translations/fr/LC_MESSAGES/qbz-ui.po

@@ -6034,3 +6034,29 @@ msgstr "Cet album ne contient aucun titre."
 
 msgid "Reactive Rings"
 msgstr "Anneaux réactifs"
+
+# Hotkeys: the Spotify-parity playback actions
+
+msgid "Volume Up"
+msgstr "Augmenter le volume"
+
+msgid "Volume Down"
+msgstr "Baisser le volume"
+
+msgid "Mute / Unmute"
+msgstr "Couper / Rétablir le son"
+
+msgid "Toggle Shuffle"
+msgstr "Basculer la lecture aléatoire"
+
+msgid "Cycle Repeat"
+msgstr "Changer le mode de répétition"
+
+msgid "Like Track"
+msgstr "Aimer le titre"
+
+msgid "Seek Forward"
+msgstr "Avancer"
+
+msgid "Seek Back"
+msgstr "Reculer"

crates/qbz-i18n/translations/ja/LC_MESSAGES/qbz-ui.po

@@ -6018,3 +6018,29 @@ msgstr "このアルバムには曲がありません。"
 
 msgid "Reactive Rings"
 msgstr "リアクティブリング"
+
+# Hotkeys: the Spotify-parity playback actions
+
+msgid "Volume Up"
+msgstr "音量を上げる"
+
+msgid "Volume Down"
+msgstr "音量を下げる"
+
+msgid "Mute / Unmute"
+msgstr "ミュート / 解除"
+
+msgid "Toggle Shuffle"
+msgstr "シャッフル切り替え"
+
+msgid "Cycle Repeat"
+msgstr "リピート切り替え"
+
+msgid "Like Track"
+msgstr "お気に入りに追加"
+
+msgid "Seek Forward"
+msgstr "早送り"
+
+msgid "Seek Back"
+msgstr "巻き戻し"

crates/qbz-i18n/translations/nl/LC_MESSAGES/qbz-ui.po

@@ -6024,3 +6024,29 @@ msgstr "Dit album bevat geen nummers."
 
 msgid "Reactive Rings"
 msgstr "Reactieve ringen"
+
+# Hotkeys: the Spotify-parity playback actions
+
+msgid "Volume Up"
+msgstr "Volume omhoog"
+
+msgid "Volume Down"
+msgstr "Volume omlaag"
+
+msgid "Mute / Unmute"
+msgstr "Dempen / Dempen opheffen"
+
+msgid "Toggle Shuffle"
+msgstr "Shuffle aan/uit"
+
+msgid "Cycle Repeat"
+msgstr "Herhaling wisselen"
+
+msgid "Like Track"
+msgstr "Nummer liken"
+
+msgid "Seek Forward"
+msgstr "Vooruit spoelen"
+
+msgid "Seek Back"
+msgstr "Terugspoelen"

crates/qbz-i18n/translations/pt/LC_MESSAGES/qbz-ui.po

@@ -6034,3 +6034,29 @@ msgstr "Este álbum não tem faixas."
 
 msgid "Reactive Rings"
 msgstr "Anéis reativos"
+
+# Hotkeys: the Spotify-parity playback actions
+
+msgid "Volume Up"
+msgstr "Aumentar Volume"
+
+msgid "Volume Down"
+msgstr "Diminuir Volume"
+
+msgid "Mute / Unmute"
+msgstr "Silenciar / Reativar Som"
+
+msgid "Toggle Shuffle"
+msgstr "Alternar Aleatório"
+
+msgid "Cycle Repeat"
+msgstr "Alternar Repetição"
+
+msgid "Like Track"
+msgstr "Curtir Faixa"
+
+msgid "Seek Forward"
+msgstr "Avançar"
+
+msgid "Seek Back"
+msgstr "Recuar"

crates/qbz-i18n/translations/ru/LC_MESSAGES/qbz-ui.po

@@ -6054,3 +6054,29 @@ msgstr "В этом альбоме нет треков."
 
 msgid "Reactive Rings"
 msgstr "Реактивные кольца"
+
+# Hotkeys: the Spotify-parity playback actions
+
+msgid "Volume Up"
+msgstr "Громче"
+
+msgid "Volume Down"
+msgstr "Тише"
+
+msgid "Mute / Unmute"
+msgstr "Звук выкл. / вкл."
+
+msgid "Toggle Shuffle"
+msgstr "Перемешивание"
+
+msgid "Cycle Repeat"
+msgstr "Режим повтора"
+
+msgid "Like Track"
+msgstr "Нравится"
+
+msgid "Seek Forward"
+msgstr "Перемотка вперёд"
+
+msgid "Seek Back"
+msgstr "Перемотка назад"

crates/qbz-qt/qml/shell/AppShell.qml

@@ -146,6 +146,14 @@ Rectangle {
     Connections {
         target: QbzHotkeys
         function onFocusSearchRequested() { header.focusSearch() }
+        // playback.favorite — the player bar's own heart call, empty-id guard
+        // included. The now-playing track id is a QbzPlayer property, so the
+        // Rust dispatch signals and QML answers rather than resolving the id
+        // twice (PlayerBar.qml:769-773).
+        function onFavoriteRequested() {
+            var id = QbzPlayer.npTrackId
+            if (id !== "") QbzQueue.queueToggleFavorite("track", id)
+        }
     }
 
     // The §4.6 Ctrl+A + multi-select Escape-exit seam. Selection state is

crates/qbz-qt/src/hotkeys_bridge.rs

@@ -133,6 +133,14 @@ pub mod qbz_hotkeys {
         /// is stale.
         #[qsignal]
         fn focus_search_requested(self: Pin<&mut QbzHotkeys>);
+
+        /// playback.favorite — the same QML seam as `focus_search_requested`.
+        /// The now-playing track id lives on QbzPlayer, not in the Rust
+        /// now-playing model, so AppShell answers this with the call the
+        /// player bar's own heart makes (`QbzQueue.queueToggleFavorite`),
+        /// empty-id guard included, instead of a second id resolution here.
+        #[qsignal]
+        fn favorite_requested(self: Pin<&mut QbzHotkeys>);
     }
 
     impl cxx_qt::Threading for QbzHotkeys {}
@@ -227,6 +235,28 @@ fn seek_relative(delta: i32) {
     crate::transport_seek(target as f32 / duration as f32);
 }
 
+/// Keyboard volume step — the same 0.05 the player bars' +/- steppers use.
+const VOLUME_STEP: f32 = 0.05;
+
+/// The player bars' `volLocked` predicate (PlayerBar.qml:88-94) in Rust: the
+/// settings-derived ALSA-Direct hardware lock is LIFTED while a peer renderer
+/// owns playback, and the sink-pushed peer lock stands on its own. Without it
+/// the hotkey would move the on-screen slider for a change the engine
+/// documents as a no-op on that path.
+fn volume_locked() -> bool {
+    let settings_locked =
+        crate::output_labels::volume_locked(&crate::settings_qt::audio_settings());
+    (settings_locked && !crate::now_playing::is_remote())
+        || crate::now_playing::remote_volume_locked()
+}
+
+fn nudge_volume(delta: f32) {
+    if volume_locked() {
+        return;
+    }
+    crate::transport_set_volume((crate::now_playing::volume() + delta).clamp(0.0, 1.0));
+}
+
 impl qbz_hotkeys::QbzHotkeys {
     pub fn boot(self: Pin<&mut Self>) {
         if QT_THREAD.set(self.qt_thread()).is_err() {
@@ -351,6 +381,14 @@ impl qbz_hotkeys::QbzHotkeys {
             // here: it lives in `QbzMini::enter`, so this hotkey and the view
             // menu's row share ONE predicate (contract §4.10.1).
             "ui.miniPlayer" => crate::mini_bridge::toggle(),
+            "playback.volumeUp" => nudge_volume(VOLUME_STEP),
+            "playback.volumeDown" => nudge_volume(-VOLUME_STEP),
+            "playback.mute" => crate::transport_toggle_mute(),
+            "playback.shuffle" => crate::transport_toggle_shuffle(),
+            "playback.repeat" => crate::transport_cycle_repeat(),
+            "playback.favorite" => self.as_mut().favorite_requested(),
+            "playback.seekForward" => seek_relative(5),
+            "playback.seekBack" => seek_relative(-5),
             "focus.seekForward" => seek_relative(5),
             "focus.seekBack" => seek_relative(-5),
             "focus.seekForwardLong" => seek_relative(10),

crates/qbz-qt/src/hotkeys_qt.rs

@@ -1,8 +1,9 @@
 //! Keyboard / hotkeys layer — the PURE core (2026-08-03 hotkeys-port contract
 //! `qbz-nix-docs/qt-frontend/2026-08-03-hotkeys-port/00-CONTRACT.md` v2 §3,
-//! block B1). Byte-faithful port of the Slint `crates/qbz/src/keybindings.rs`
-//! model: the 23-action DEFAULTS table (:88-117 — NB its :3 "26 actions"
-//! comment is STALE, do not "fix" the count), the shortcut-string grammar
+//! block B1). Port of the Slint `crates/qbz/src/keybindings.rs`
+//! model: the DEFAULTS table (:88-117 — 23 actions at the time of the port;
+//! NB its :3 "26 actions" comment is STALE, do not "fix" the count), the
+//! shortcut-string grammar
 //! (:153-249), the bindings store + conflict detection (:256-323), the groups
 //! builder + three-column round-robin (:329-380), the capture semantics
 //! (:434-467) and the §1.2 Escape priority stack (:585-615).
@@ -12,6 +13,12 @@
 //! suggestions_bridge precedent). Do NOT list this file in build.rs
 //! rust_files.
 //!
+//! ONE deliberate addition POST-port, additive to the ported model: eight
+//! Playback actions the Slint table never had (volume, mute, shuffle, repeat,
+//! like, and a surface-independent seek — Spotify's desktop defaults).
+//! Everything below still resolves through one action table and one canonical
+//! shortcut string.
+//!
 //! The one intentional DIFFERENCE from Slint is the token source (contract
 //! §3.1 HYBRID rule, round-1 F1): Slint reads winit's LOGICAL key, which is
 //! already the shifted glyph AND Ctrl-independent; a QKeyEvent's `text()` is
@@ -156,6 +163,65 @@ pub const ACTIONS: &[ActionDef] = &[
         default: "Ctrl+ArrowLeft",
         context: Context::None,
     },
+    ActionDef {
+        id: "playback.volumeUp",
+        label_en: "Volume Up",
+        category: Category::Playback,
+        default: "Ctrl+ArrowUp",
+        context: Context::None,
+    },
+    ActionDef {
+        id: "playback.volumeDown",
+        label_en: "Volume Down",
+        category: Category::Playback,
+        default: "Ctrl+ArrowDown",
+        context: Context::None,
+    },
+    ActionDef {
+        id: "playback.mute",
+        label_en: "Mute / Unmute",
+        category: Category::Playback,
+        default: "m",
+        context: Context::None,
+    },
+    ActionDef {
+        id: "playback.shuffle",
+        label_en: "Toggle Shuffle",
+        category: Category::Playback,
+        default: "Ctrl+s",
+        context: Context::None,
+    },
+    ActionDef {
+        id: "playback.repeat",
+        label_en: "Cycle Repeat",
+        category: Category::Playback,
+        default: "Ctrl+r",
+        context: Context::None,
+    },
+    ActionDef {
+        id: "playback.favorite",
+        label_en: "Like Track",
+        category: Category::Playback,
+        default: "Alt+Shift+B",
+        context: Context::None,
+    },
+    // Seek from ANY surface. The `focus.seek*` rows below stay bare arrows and
+    // stay immersive-only: there the arrows are free, everywhere else they
+    // belong to whatever the pointer is over.
+    ActionDef {
+        id: "playback.seekForward",
+        label_en: "Seek Forward",
+        category: Category::Playback,
+        default: "Ctrl+Shift+ArrowRight",
+        context: Context::None,
+    },
+    ActionDef {
+        id: "playback.seekBack",
+        label_en: "Seek Back",
+        category: Category::Playback,
+        default: "Ctrl+Shift+ArrowLeft",
+        context: Context::None,
+    },
     // Navigation
     ActionDef {
         id: "nav.back",
@@ -996,8 +1062,8 @@ mod tests {
         overrides.insert("stale.removed.action".into(), "x".into()); // unknown id
         let bindings = active_bindings_with(&overrides);
         assert_eq!(bindings.get("ui.queue").unwrap(), "w");
-        // The known count is exactly the 23 actions; the stale id is absent.
-        assert_eq!(bindings.len(), 23);
+        // The known count is exactly the action table; the stale id is absent.
+        assert_eq!(bindings.len(), ACTIONS.len());
         assert!(!bindings.contains_key("stale.removed.action"));
         // …but the overrides map itself is untouched (kept in the file).
         assert_eq!(overrides.get("stale.removed.action").unwrap(), "x");
@@ -1238,4 +1304,45 @@ mod tests {
         assert!(!is_ctrl_a(key_a, 0, "a"));
         assert!(!is_ctrl_a(QT_KEY_A + 1, QT_CONTROL, ""));
     }
+
+    // --- The new Spotify-parity actions ------------------------------------
+
+    #[test]
+    fn the_new_playback_actions_dispatch_on_their_defaults() {
+        let ov = no_overrides();
+        for (key, modifiers, text, id) in [
+            (QT_KEY_UP, QT_CONTROL, "", "playback.volumeUp"),
+            (QT_KEY_DOWN, QT_CONTROL, "", "playback.volumeDown"),
+            (QT_KEY_A + 12, 0, "m", "playback.mute"),
+            (QT_KEY_A + 18, QT_CONTROL, "", "playback.shuffle"),
+            (QT_KEY_A + 17, QT_CONTROL, "", "playback.repeat"),
+            (QT_KEY_A + 1, QT_ALT | QT_SHIFT, "", "playback.favorite"),
+            (QT_KEY_RIGHT, QT_CONTROL | QT_SHIFT, "", "playback.seekForward"),
+            (QT_KEY_LEFT, QT_CONTROL | QT_SHIFT, "", "playback.seekBack"),
+        ] {
+            let a = action_for_key(&ov, key, modifiers, text, false)
+                .unwrap_or_else(|| panic!("{id} did not resolve"));
+            assert_eq!(a.id, id);
+        }
+    }
+
+    /// The global seek rows fire anywhere; the immersive ones keep their bare
+    /// arrows and stay gated on the overlay.
+    #[test]
+    fn global_seek_is_context_free_and_immersive_seek_still_is_not() {
+        let ov = no_overrides();
+        let global = action_for_key(
+            &ov,
+            QT_KEY_RIGHT,
+            QT_CONTROL | QT_SHIFT,
+            "",
+            false,
+        )
+        .unwrap();
+        assert_eq!(global.id, "playback.seekForward");
+        assert_eq!(global.context, Context::None);
+        assert!(action_for_key(&ov, QT_KEY_RIGHT, 0, "", false).is_none());
+        let imm = action_for_key(&ov, QT_KEY_RIGHT, 0, "", true).unwrap();
+        assert_eq!(imm.id, "focus.seekForward");
+    }
 }

crates/qbz-qt/src/now_playing.rs

@@ -507,6 +507,18 @@ pub fn is_remote() -> bool {
     with_model(|m| m.is_remote).0
 }
 
+/// Read-only: the current output volume 0..1. The keyboard volume steps read
+/// it to compute the next value (the bars read the published property).
+pub(crate) fn volume() -> f32 {
+    with_model(|m| m.volume).0
+}
+
+/// Read-only mirror of `set_remote_volume_locked` — the active peer renderer
+/// disallows remote volume control. Half of the hotkeys' `volume_locked`.
+pub(crate) fn remote_volume_locked() -> bool {
+    with_model(|m| m.remote_volume_locked).0
+}
+
 /// The REMOTE volume lock (contract §11.3): the active peer Qobuz Connect
 /// renderer disallows remote volume control. Written from the qconnect sink's
 /// badge refresh alongside `set_remote`, and cleared by the facade's