Refactor optimizer with aggressive collapsing

The optimizer has been refactored to separate its phases and introduce
more aggressive collapsing capabilities.

Phase 2 (Cracking) now focuses on stateless transformations, making it
easier to reason about and potentially parallelize.

Phase 2.5 (Aggressive Collapsing) has been introduced, enabling
optimizations like:
- Beta-reduction for lambda literals.
- Cracking and inlining for constant closures.
- Folding intrinsics for constant arithmetic.
- Short-circuiting conditional expressions.

These changes aim to improve performance by reducing redundant
computations and code bloat. The maximum number of optimization passes
has also been increased to 5 to allow for more complex transformations.

src/main.rs

@@ -95,12 +95,13 @@ impl CompilerApp {
 
         // Reset environment for a fresh run
         self.env = Environment::new();
+        self.env.optimization_level = 2;
 
         let res = (|| -> Result<(myc::ast::types::Value, std::time::Duration), String> {
             let start_run = std::time::Instant::now();
             let result = if self.debug_enabled {
                 let (res, logs) = self.env.run_debug(&self.source_code)?;
-                
+
                 // Batch-truncate logs for GUI performance
                 let mut display_logs = logs;
                 if display_logs.len() > 1000 {
@@ -110,9 +111,10 @@ impl CompilerApp {
 
                 for line in &mut display_logs {
                     if line.len() > 255
-                        && let Some((idx, _)) = line.char_indices().nth(255) {
-                            line.truncate(idx);
-                            line.push_str("...");
+                        && let Some((idx, _)) = line.char_indices().nth(255)
+                    {
+                        line.truncate(idx);
+                        line.push_str("...");
                     }
                 }
 
@@ -131,7 +133,7 @@ impl CompilerApp {
             Ok((val, d_run)) => {
                 let d_total = start_total.elapsed();
                 let now = chrono::Local::now().format("%H:%M:%S").to_string();
-                
+
                 let mut stats = format!(
                     "Execution Successful.\nResult: {}\n\nTotal Duration: {:?}\nFinished at: {}",
                     val, d_total, now,