feat: add profile language preferences and refine toast, dropdown and history UI

build.rs

@@ -0,0 +1,35 @@
+use std::{env, fs, path::PathBuf};
+
+fn main() {
+    println!("cargo:rerun-if-changed=lang");
+
+    let manifest_dir = PathBuf::from(env::var("CARGO_MANIFEST_DIR").expect("CARGO_MANIFEST_DIR"));
+    let lang_dir = manifest_dir.join("lang");
+    let mut files = fs::read_dir(&lang_dir)
+        .unwrap_or_else(|error| panic!("failed to read {}: {error}", lang_dir.display()))
+        .filter_map(Result::ok)
+        .map(|entry| entry.path())
+        .filter(|path| path.extension().and_then(|value| value.to_str()) == Some("json"))
+        .collect::<Vec<_>>();
+    files.sort();
+
+    if files.is_empty() {
+        panic!("lang directory must contain at least one .json language file");
+    }
+
+    let mut generated = String::from("pub const EMBEDDED_LANGUAGE_FILES: &[(&str, &str)] = &[\n");
+    for path in files {
+        let name = path
+            .file_name()
+            .and_then(|value| value.to_str())
+            .expect("language filename must be valid UTF-8");
+        println!("cargo:rerun-if-changed=lang/{name}");
+        generated.push_str(&format!(
+            "    ({name:?}, include_str!(concat!(env!(\"CARGO_MANIFEST_DIR\"), \"/lang/{name}\"))),\n"
+        ));
+    }
+    generated.push_str("];\n");
+
+    let out_dir = PathBuf::from(env::var("OUT_DIR").expect("OUT_DIR"));
+    fs::write(out_dir.join("languages.rs"), generated).expect("failed to generate embedded languages");
+}