Multilingual support via Fluent + Frontend improvements + Rewrite of ArcReactor

frontend/src/lib/i18n.ts

@@ -0,0 +1,55 @@
+import { writable, derived } from "svelte/store"
+import { invoke } from "@tauri-apps/api/core"
+
+// stores
+export const translations = writable<Record<string, string>>({})
+export const currentLanguage = writable<string>("ru")
+
+// simple helper function (not a store)
+export function translate(translations: Record<string, string>, key: string, fallback?: string): string {
+    return translations[key] || fallback || key
+}
+
+// load translations from backend
+export async function loadTranslations() {
+    try {
+        const [trans, lang] = await Promise.all([
+            invoke<Record<string, string>>("get_translations"),
+            invoke<string>("get_current_language")
+        ])
+        translations.set(trans)
+        currentLanguage.set(lang)
+    } catch (err) {
+        console.error("Failed to load translations:", err)
+    }
+}
+
+// change language
+export async function setLanguage(lang: string) {
+    try {
+        const newTranslations = await invoke<Record<string, string>>("set_language", { lang })
+        translations.set(newTranslations)
+        currentLanguage.set(lang)
+    } catch (err) {
+        console.error("Failed to set language:", err)
+    }
+}
+
+export async function loadLanguage() {
+    try {
+        const lang = await invoke<string>("db_read", { key: "language" })
+        if (lang) {
+            currentLanguage.set(lang)
+        }
+    } catch (err) {
+        console.error("Failed to load language:", err)
+    }
+}
+
+export async function getSupportedLanguages(): Promise<string[]> {
+    try {
+        return await invoke<string[]>("get_supported_languages")
+    } catch {
+        return ["ru", "en", "ua"]
+    }
+}