Rename Event to AppEvent and update imports

Rename the generic `Event` enum to `AppEvent` and propagate the change
through `app.rs`, `mod.rs`, and `main.rs`. Adjust function signatures,
imports, and channel usage to use the new name and the `read` helper
from crossterm. Ensure all senders/receivers now work with `AppEvent`.

src/app/mod.rs

@@ -8,7 +8,7 @@ pub mod view;
 pub mod views;
 pub mod widgets;
 
-pub use app::{App, Event, handle_input_events};
+pub use app::{App, AppEvent, handle_input_events};
 pub use keybind::handle_keybindings;
 pub use state::GameStates;
 pub use view::View;