Add real file loading: native file/folder picker + OS drag-and-drop, backed by real Rust commands (pick_files/pick_folder/expand_dropped_paths)

src-tauri/src/lib.rs

@@ -1,3 +1,5 @@
+mod files;
+
 use renamr_core::format::ExpressionFormat;
 use renamr_core::string_bindings;
 use std::collections::HashMap;
@@ -16,7 +18,13 @@ fn render_expression(expression: String, bindings: HashMap<String, String>) -> R
 #[cfg_attr(mobile, tauri::mobile_entry_point)]
 pub fn run() {
     tauri::Builder::default()
-        .invoke_handler(tauri::generate_handler![render_expression])
+        .plugin(tauri_plugin_dialog::init())
+        .invoke_handler(tauri::generate_handler![
+            render_expression,
+            files::pick_files,
+            files::pick_folder,
+            files::expand_dropped_paths,
+        ])
         .run(tauri::generate_context!())
         .expect("error while running Renamr");
 }