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

hcie-iced-app/crates/hcie-iced-gui/src/i18n.rs

@@ -0,0 +1,86 @@
+//! Internationalization (i18n) support for the HCIE Iced GUI.
+//!
+//! Provides translation keys for UI strings with English and Turkish locales.
+//! The `t()` function returns a `&'static str` for the given language and key,
+//! enabling zero-cost string lookups at render time.
+
+use serde::{Deserialize, Serialize};
+
+/// Supported UI languages.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default, Serialize, Deserialize)]
+pub enum Language {
+    #[default]
+    English,
+    Turkish,
+}
+
+/// Translation keys for menu items and common UI strings.
+#[allow(dead_code)]
+pub enum TranslationKey {
+    File,
+    Edit,
+    Image,
+    Layer,
+    Filter,
+    Select,
+    View,
+    Window,
+    Help,
+    Tools,
+    New,
+    Open,
+    Save,
+    Export,
+    Quit,
+    Undo,
+    Redo,
+    Settings,
+}
+
+/// Returns the translated string for the given language and key.
+///
+/// Uses match arms to return `&'static str` — no allocations at call site.
+pub fn t(lang: Language, key: TranslationKey) -> &'static str {
+    match lang {
+        Language::Turkish => match key {
+            TranslationKey::File => "Dosya",
+            TranslationKey::Edit => "Düzen",
+            TranslationKey::Image => "Görüntü",
+            TranslationKey::Layer => "Katman",
+            TranslationKey::Filter => "Filtre",
+            TranslationKey::Select => "Seç",
+            TranslationKey::View => "Görünüm",
+            TranslationKey::Window => "Pencere",
+            TranslationKey::Help => "Yardım",
+            TranslationKey::Tools => "Araçlar",
+            TranslationKey::New => "Yeni...",
+            TranslationKey::Open => "Aç...",
+            TranslationKey::Save => "Kaydet",
+            TranslationKey::Export => "Dışa Aktar...",
+            TranslationKey::Quit => "Çıkış",
+            TranslationKey::Undo => "Geri Al",
+            TranslationKey::Redo => "İleri Al",
+            TranslationKey::Settings => "Ayarlar",
+        },
+        Language::English => match key {
+            TranslationKey::File => "File",
+            TranslationKey::Edit => "Edit",
+            TranslationKey::Image => "Image",
+            TranslationKey::Layer => "Layer",
+            TranslationKey::Filter => "Filter",
+            TranslationKey::Select => "Select",
+            TranslationKey::View => "View",
+            TranslationKey::Window => "Window",
+            TranslationKey::Help => "Help",
+            TranslationKey::Tools => "Tools",
+            TranslationKey::New => "New...",
+            TranslationKey::Open => "Open...",
+            TranslationKey::Save => "Save",
+            TranslationKey::Export => "Export...",
+            TranslationKey::Quit => "Quit",
+            TranslationKey::Undo => "Undo",
+            TranslationKey::Redo => "Redo",
+            TranslationKey::Settings => "Settings",
+        },
+    }
+}

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

@@ -10,6 +10,7 @@ mod canvas;
 mod color_picker;
 mod dialogs;
 mod dock;
+mod i18n;
 mod io;
 mod panels;
 mod script;