feat(tui): declarative keymap + command registry

crates/owlen-core/src/state/mod.rs

@@ -3,14 +3,14 @@
 use std::fmt;
 
 /// High-level application state reported by the UI loop.
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub enum AppState {
     Running,
     Quit,
 }
 
 /// Vim-style input modes supported by the TUI.
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub enum InputMode {
     Normal,
     Editing,
@@ -45,7 +45,7 @@ impl fmt::Display for InputMode {
 }
 
 /// Represents which panel is currently focused in the TUI layout.
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub enum FocusedPanel {
     Files,
     Chat,