feat(iced): add internationalization support

hcie-iced-app/crates/hcie-iced-gui/src/app.rs

@@ -14,6 +14,7 @@
 
 use crate::ai_chat::{self, AiChatState, ChatMessage, SYSTEM_PROMPT};
 use crate::dialogs;
+use crate::i18n;
 use crate::dock::state::{DockState, PaneType};
 use crate::io::tablet::TabletState;
 use crate::panels;
@@ -191,6 +192,8 @@ pub struct HcieIcedApp {
     pub dock_profile_rename_buf: String,
     /// Whether the dock profile dialog is visible.
     pub show_dock_profile_dialog: bool,
+    /// Current UI language for internationalization.
+    pub language: i18n::Language,
 }
 
 /// A recently opened file entry.
@@ -745,6 +748,7 @@ impl HcieIcedApp {
             dock_profile_rename_idx: None,
             dock_profile_rename_buf: String::new(),
             show_dock_profile_dialog: false,
+            language: i18n::Language::default(),
         };
 
         // Apply saved settings to tool state