feat: add hotkey system (#48)

* feat: add hotkey system for playing individual sounds

Slot-based hotkey mappings stored in ~/.config/pwsp/hotkeys.json.
Daemon serves hotkey IPC commands for CLI/compositor bindings.
GUI supports focused hotkey triggers, a dedicated Hotkeys panel
with search and conflict detection, file badges, and a key chord
capture dialog. CLI gains play-hotkey, get hotkeys, set hotkey,
set hotkey-key, and clear-hotkey subcommands.

* feat: add global hotkey support via evdev

Listen for keyboard events directly from /dev/input using evdev,
enabling hotkeys to work system-wide regardless of window focus
or display server (X11, GNOME, KDE Plasma, Hyprland).

The daemon spawns async listeners for each keyboard device at
startup, tracks modifier state, and triggers playback when a
configured chord matches. Requires the user to be in the 'input'
group; logs a warning and continues without global hotkeys if
devices are inaccessible.

* various changes

* refactor: route hotkey mutations through daemon IPC

GUI no longer writes hotkey config directly to disk. Instead, all
mutations (set slot, set key chord, clear chord, remove slot) are
sent to the daemon via IPC, which persists the changes. The state
thread periodically syncs the hotkey config back from the daemon,
so CLI-made changes are reflected in the GUI.

New IPC commands: set_hotkey_action (arbitrary action per slot),
clear_hotkey_key (remove key chord without removing the slot).

Also removes unreachable capture overlay from draw_hotkeys().

* small refactor

---------

Co-authored-by: arabian <a.tevg@ya.ru>

src/types/commands.rs

@@ -1,9 +1,11 @@
 use crate::{
     types::{
         audio_player::{FullState, PlayerState},
-        socket::Response,
+        config::HotkeyConfig,
+        socket::{Request, Response},
     },
     utils::{
+        commands::parse_command,
         daemon::get_audio_player,
         pipewire::{get_all_devices, get_device},
     },
@@ -90,6 +92,35 @@ pub struct GetDaemonVersionCommand {}
 
 pub struct GetFullStateCommand {}
 
+pub struct GetHotkeysCommand {}
+
+pub struct SetHotkeyCommand {
+    pub slot: Option<String>,
+    pub file_path: Option<PathBuf>,
+}
+
+pub struct SetHotkeyKeyCommand {
+    pub slot: Option<String>,
+    pub key_chord: Option<String>,
+}
+
+pub struct ClearHotkeyCommand {
+    pub slot: Option<String>,
+}
+
+pub struct PlayHotkeyCommand {
+    pub slot: Option<String>,
+}
+
+pub struct SetHotkeyActionCommand {
+    pub slot: Option<String>,
+    pub action: Option<Request>,
+}
+
+pub struct ClearHotkeyKeyCommand {
+    pub slot: Option<String>,
+}
+
 #[async_trait]
 impl Executable for PingCommand {
     async fn execute(&self) -> Response {
@@ -481,3 +512,168 @@ impl Executable for GetFullStateCommand {
         }
     }
 }
+
+#[async_trait]
+impl Executable for GetHotkeysCommand {
+    async fn execute(&self) -> Response {
+        match HotkeyConfig::load() {
+            Ok(config) => match serde_json::to_string(&config) {
+                Ok(json) => Response::new(true, json),
+                Err(err) => Response::new(false, format!("Failed to serialize hotkeys: {}", err)),
+            },
+            Err(err) => Response::new(false, format!("Failed to load hotkeys: {}", err)),
+        }
+    }
+}
+
+#[async_trait]
+impl Executable for SetHotkeyCommand {
+    async fn execute(&self) -> Response {
+        let Some(slot) = &self.slot else {
+            return Response::new(false, "Missing slot name");
+        };
+        let Some(file_path) = &self.file_path else {
+            return Response::new(false, "Missing file path");
+        };
+
+        let mut config = match HotkeyConfig::load() {
+            Ok(c) => c,
+            Err(err) => return Response::new(false, format!("Failed to load hotkeys: {}", err)),
+        };
+
+        config.set_slot(
+            slot.clone(),
+            Request::play(&file_path.to_string_lossy(), false),
+        );
+
+        match config.save() {
+            Ok(_) => Response::new(true, format!("Hotkey slot '{}' set", slot)),
+            Err(err) => Response::new(false, format!("Failed to save hotkeys: {}", err)),
+        }
+    }
+}
+
+#[async_trait]
+impl Executable for SetHotkeyKeyCommand {
+    async fn execute(&self) -> Response {
+        let Some(slot) = &self.slot else {
+            return Response::new(false, "Missing slot name");
+        };
+        let Some(key_chord) = &self.key_chord else {
+            return Response::new(false, "Missing key chord");
+        };
+
+        let mut config = match HotkeyConfig::load() {
+            Ok(c) => c,
+            Err(err) => return Response::new(false, format!("Failed to load hotkeys: {}", err)),
+        };
+
+        if !config.set_key_chord(slot, Some(key_chord.clone())) {
+            return Response::new(false, format!("Slot '{}' not found", slot));
+        }
+
+        match config.save() {
+            Ok(_) => Response::new(
+                true,
+                format!("Key chord for slot '{}' set to '{}'", slot, key_chord),
+            ),
+            Err(err) => Response::new(false, format!("Failed to save hotkeys: {}", err)),
+        }
+    }
+}
+
+#[async_trait]
+impl Executable for ClearHotkeyCommand {
+    async fn execute(&self) -> Response {
+        let Some(slot) = &self.slot else {
+            return Response::new(false, "Missing slot name");
+        };
+
+        let mut config = match HotkeyConfig::load() {
+            Ok(c) => c,
+            Err(err) => return Response::new(false, format!("Failed to load hotkeys: {}", err)),
+        };
+
+        if config.remove_slot(slot) {
+            match config.save() {
+                Ok(_) => Response::new(true, format!("Hotkey slot '{}' cleared", slot)),
+                Err(err) => Response::new(false, format!("Failed to save hotkeys: {}", err)),
+            }
+        } else {
+            Response::new(false, format!("Slot '{}' not found", slot))
+        }
+    }
+}
+
+#[async_trait]
+impl Executable for PlayHotkeyCommand {
+    async fn execute(&self) -> Response {
+        let Some(slot) = &self.slot else {
+            return Response::new(false, "Missing slot name");
+        };
+
+        let config = match HotkeyConfig::load() {
+            Ok(c) => c,
+            Err(err) => return Response::new(false, format!("Failed to load hotkeys: {}", err)),
+        };
+
+        let Some(hotkey_slot) = config.find_slot(slot) else {
+            return Response::new(false, format!("Slot '{}' not found", slot));
+        };
+
+        let action = hotkey_slot.action.clone();
+
+        if let Some(cmd) = parse_command(&action) {
+            cmd.execute().await
+        } else {
+            Response::new(false, "Unknown command in hotkey slot".to_string())
+        }
+    }
+}
+
+#[async_trait]
+impl Executable for SetHotkeyActionCommand {
+    async fn execute(&self) -> Response {
+        let Some(slot) = &self.slot else {
+            return Response::new(false, "Missing slot name");
+        };
+        let Some(action) = &self.action else {
+            return Response::new(false, "Missing or invalid action");
+        };
+
+        let mut config = match HotkeyConfig::load() {
+            Ok(c) => c,
+            Err(err) => return Response::new(false, format!("Failed to load hotkeys: {}", err)),
+        };
+
+        config.set_slot(slot.clone(), action.clone());
+
+        match config.save() {
+            Ok(_) => Response::new(true, format!("Hotkey slot '{}' set", slot)),
+            Err(err) => Response::new(false, format!("Failed to save hotkeys: {}", err)),
+        }
+    }
+}
+
+#[async_trait]
+impl Executable for ClearHotkeyKeyCommand {
+    async fn execute(&self) -> Response {
+        let Some(slot) = &self.slot else {
+            return Response::new(false, "Missing slot name");
+        };
+
+        let mut config = match HotkeyConfig::load() {
+            Ok(c) => c,
+            Err(err) => return Response::new(false, format!("Failed to load hotkeys: {}", err)),
+        };
+
+        if !config.set_key_chord(slot, None) {
+            return Response::new(false, format!("Slot '{}' not found", slot));
+        }
+
+        match config.save() {
+            Ok(_) => Response::new(true, format!("Key chord for slot '{}' cleared", slot)),
+            Err(err) => Response::new(false, format!("Failed to save hotkeys: {}", err)),
+        }
+    }
+}