feat: Enhance #use directive for directories and cwd

The `#use` directive now supports referencing entire directories,
automatically including all `.myc` files within them. Additionally,
environments are now initialized with the current working directory as a
default search path, simplifying module resolution.

src/main.rs

@@ -61,6 +61,8 @@ impl Default for CompilerApp {
             })
             .unwrap_or_default();
 
+        let env = Environment::new().with_cwd();
+
         Self {
             source_code: String::from(
                 r#"
@@ -81,7 +83,7 @@ impl Default for CompilerApp {
             trace_logs: Vec::new(),
             active_tab: AppTab::Output,
             debug_enabled: false,
-            env: Environment::new(),
+            env,
             is_first_frame: true,
             examples,
         }
@@ -94,7 +96,7 @@ impl CompilerApp {
         self.trace_logs.clear();
 
         // Reset environment for a fresh run
-        self.env = Environment::new();
+        self.env = Environment::new().with_cwd();
         self.env.optimization = true;
 
         let res = (|| -> Result<(myc::ast::types::Value, std::time::Duration), String> {
@@ -160,7 +162,7 @@ impl CompilerApp {
     }
 
     fn dump_ast(&mut self) {
-        self.env = Environment::new();
+        self.env = Environment::new().with_cwd();
         self.env.optimization = true; // Enable optimization for AST dump
         
         if let Err(e) = self.env.preload_dependencies(&self.source_code, self.current_example_path.as_deref()) {