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-gui/src/gui/views/mod.rs

@@ -0,0 +1,32 @@
+use crate::gui::SoundpadGui;
+use egui::Ui;
+use egui_material_icons::icons::*;
+
+mod body;
+mod footer;
+mod header;
+mod hotkey_capture;
+mod hotkeys;
+mod settings;
+mod waiting_for_daemon;
+
+impl SoundpadGui {
+    pub(crate) fn get_volume_icon(volume: f32) -> &'static str {
+        if volume > 0.7 {
+            ICON_VOLUME_UP.codepoint
+        } else if volume <= 0.0 {
+            ICON_VOLUME_OFF.codepoint
+        } else if volume < 0.3 {
+            ICON_VOLUME_MUTE.codepoint
+        } else {
+            ICON_VOLUME_DOWN.codepoint
+        }
+    }
+
+    pub fn draw(&mut self, ui: &mut Ui) {
+        self.draw_header(ui);
+        self.draw_body(ui);
+        ui.separator();
+        self.draw_footer(ui);
+    }
+}