Refactor to Cargo Workspace (#129)

* Refactor project into a Cargo workspace with distinct packages

- Created a root `Cargo.toml` defining a workspace.
- Moved `src/types` and `src/utils` into a new `pwsp-lib` crate for shared logic.
- Split binaries into their own crates: `pwsp-daemon`, `pwsp-cli`, and `pwsp-gui`.
- Shifted all dependencies into `[workspace.dependencies]` for centralized version management.
- Updated import paths across all crates (e.g. from `pwsp::` to `pwsp_lib::`).
- Updated build scripts, GitHub actions, Flatpak manifest, and AUR PKGBUILD to support the new workspace structure.
- Ensured no core application logic was altered.

Co-authored-by: arabianq <55220741+arabianq@users.noreply.github.com>

* Fix cargo-deb build process in GitHub actions for workspace architecture

Co-authored-by: arabianq <55220741+arabianq@users.noreply.github.com>

* Fix cargo-deb asset discovery by using exact target/release paths

Co-authored-by: arabianq <55220741+arabianq@users.noreply.github.com>

* refactor deps in Cargo.toml files

* fix incorrect assets path

---------

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

pwsp-lib/src/utils/global_hotkeys.rs

@@ -0,0 +1,201 @@
+use crate::{types::config::HotkeyConfig, utils::commands::parse_command};
+use evdev::{Device, EventStream, EventSummary, KeyCode};
+
+struct ModifierState {
+    ctrl: bool,
+    alt: bool,
+    shift: bool,
+    meta: bool,
+}
+
+impl ModifierState {
+    fn new() -> Self {
+        Self {
+            ctrl: false,
+            alt: false,
+            shift: false,
+            meta: false,
+        }
+    }
+
+    fn update(&mut self, key: KeyCode, pressed: bool) {
+        match key {
+            KeyCode::KEY_LEFTCTRL | KeyCode::KEY_RIGHTCTRL => self.ctrl = pressed,
+            KeyCode::KEY_LEFTALT | KeyCode::KEY_RIGHTALT => self.alt = pressed,
+            KeyCode::KEY_LEFTSHIFT | KeyCode::KEY_RIGHTSHIFT => self.shift = pressed,
+            KeyCode::KEY_LEFTMETA | KeyCode::KEY_RIGHTMETA => self.meta = pressed,
+            _ => {}
+        }
+    }
+
+    fn any_active(&self) -> bool {
+        self.ctrl || self.alt || self.shift || self.meta
+    }
+
+    fn is_modifier(key: KeyCode) -> bool {
+        matches!(
+            key,
+            KeyCode::KEY_LEFTCTRL
+                | KeyCode::KEY_RIGHTCTRL
+                | KeyCode::KEY_LEFTALT
+                | KeyCode::KEY_RIGHTALT
+                | KeyCode::KEY_LEFTSHIFT
+                | KeyCode::KEY_RIGHTSHIFT
+                | KeyCode::KEY_LEFTMETA
+                | KeyCode::KEY_RIGHTMETA
+        )
+    }
+}
+
+fn evdev_key_name(key: KeyCode) -> Option<&'static str> {
+    match key {
+        KeyCode::KEY_A => Some("A"),
+        KeyCode::KEY_B => Some("B"),
+        KeyCode::KEY_C => Some("C"),
+        KeyCode::KEY_D => Some("D"),
+        KeyCode::KEY_E => Some("E"),
+        KeyCode::KEY_F => Some("F"),
+        KeyCode::KEY_G => Some("G"),
+        KeyCode::KEY_H => Some("H"),
+        KeyCode::KEY_I => Some("I"),
+        KeyCode::KEY_J => Some("J"),
+        KeyCode::KEY_K => Some("K"),
+        KeyCode::KEY_L => Some("L"),
+        KeyCode::KEY_M => Some("M"),
+        KeyCode::KEY_N => Some("N"),
+        KeyCode::KEY_O => Some("O"),
+        KeyCode::KEY_P => Some("P"),
+        KeyCode::KEY_Q => Some("Q"),
+        KeyCode::KEY_R => Some("R"),
+        KeyCode::KEY_S => Some("S"),
+        KeyCode::KEY_T => Some("T"),
+        KeyCode::KEY_U => Some("U"),
+        KeyCode::KEY_V => Some("V"),
+        KeyCode::KEY_W => Some("W"),
+        KeyCode::KEY_X => Some("X"),
+        KeyCode::KEY_Y => Some("Y"),
+        KeyCode::KEY_Z => Some("Z"),
+        KeyCode::KEY_1 => Some("1"),
+        KeyCode::KEY_2 => Some("2"),
+        KeyCode::KEY_3 => Some("3"),
+        KeyCode::KEY_4 => Some("4"),
+        KeyCode::KEY_5 => Some("5"),
+        KeyCode::KEY_6 => Some("6"),
+        KeyCode::KEY_7 => Some("7"),
+        KeyCode::KEY_8 => Some("8"),
+        KeyCode::KEY_9 => Some("9"),
+        KeyCode::KEY_0 => Some("0"),
+        KeyCode::KEY_F1 => Some("F1"),
+        KeyCode::KEY_F2 => Some("F2"),
+        KeyCode::KEY_F3 => Some("F3"),
+        KeyCode::KEY_F4 => Some("F4"),
+        KeyCode::KEY_F5 => Some("F5"),
+        KeyCode::KEY_F6 => Some("F6"),
+        KeyCode::KEY_F7 => Some("F7"),
+        KeyCode::KEY_F8 => Some("F8"),
+        KeyCode::KEY_F9 => Some("F9"),
+        KeyCode::KEY_F10 => Some("F10"),
+        KeyCode::KEY_F11 => Some("F11"),
+        KeyCode::KEY_F12 => Some("F12"),
+        _ => None,
+    }
+}
+
+fn build_chord(modifiers: &ModifierState, key_name: &str) -> String {
+    let mut parts = Vec::with_capacity(5);
+    if modifiers.ctrl {
+        parts.push("Ctrl");
+    }
+    if modifiers.alt {
+        parts.push("Alt");
+    }
+    if modifiers.shift {
+        parts.push("Shift");
+    }
+    if modifiers.meta {
+        parts.push("Super");
+    }
+    parts.push(key_name);
+    parts.join("+")
+}
+
+fn is_keyboard(device: &Device) -> bool {
+    device
+        .supported_keys()
+        .is_some_and(|keys| keys.contains(KeyCode::KEY_A) && keys.contains(KeyCode::KEY_Z))
+}
+
+async fn handle_device_events(mut stream: EventStream) {
+    let mut modifiers = ModifierState::new();
+
+    loop {
+        match stream.next_event().await {
+            Ok(event) => {
+                if let EventSummary::Key(_, key, value) = event.destructure() {
+                    // 0 = released, 1 = pressed, 2 = repeat
+                    if value == 0 || value == 1 {
+                        modifiers.update(key, value == 1);
+                    }
+
+                    // Only trigger on press, skip modifiers and bare keys
+                    if value != 1 || ModifierState::is_modifier(key) || !modifiers.any_active() {
+                        continue;
+                    }
+
+                    let Some(key_name) = evdev_key_name(key) else {
+                        continue;
+                    };
+
+                    let chord = build_chord(&modifiers, key_name);
+
+                    let config = match HotkeyConfig::load() {
+                        Ok(c) => c,
+                        Err(_) => continue,
+                    };
+
+                    let slots = config.slots_for_chord(&chord);
+                    for slot in slots {
+                        if let Some(cmd) = parse_command(&slot.action) {
+                            cmd.execute().await;
+                        }
+                    }
+                }
+            }
+            Err(e) => {
+                eprintln!("Global hotkeys: device read error: {e}");
+                break;
+            }
+        }
+    }
+}
+
+pub async fn start_global_hotkey_listener() {
+    let keyboards: Vec<_> = evdev::enumerate()
+        .filter(|(_, dev)| is_keyboard(dev))
+        .collect();
+
+    if keyboards.is_empty() {
+        eprintln!(
+            "Global hotkeys: no keyboard devices found. \
+             Make sure your user is in the 'input' group."
+        );
+        return;
+    }
+
+    println!(
+        "Global hotkeys: found {} keyboard device(s)",
+        keyboards.len()
+    );
+
+    for (path, device) in keyboards {
+        match device.into_event_stream() {
+            Ok(stream) => {
+                println!("Global hotkeys: listening on {}", path.display());
+                tokio::spawn(handle_device_events(stream));
+            }
+            Err(e) => {
+                eprintln!("Global hotkeys: failed to open {}: {}", path.display(), e);
+            }
+        }
+    }
+}