Add while loop support and token pretty printing

The commit adds while loop statements and improves token display
formatting:

- Implements while loop syntax and evaluation - Adds a new token pretty
printing module with configurable formatting - Improves token display
with colors and different output modes

src/logging/display_ast.rs

@@ -265,7 +265,6 @@ impl PrettyPrint for Stmt {
                     write!(f, "{}}}", indent)
                 }
             }
-
             Stmt::Print { expression } => {
                 if ctx.config.compact {
                     let expr_str =
@@ -279,7 +278,6 @@ impl PrettyPrint for Stmt {
                     write!(f, "{}}}", indent)
                 }
             }
-
             Stmt::Var { name, initializer } => {
                 if ctx.config.compact {
                     match initializer {
@@ -306,7 +304,6 @@ impl PrettyPrint for Stmt {
                     write!(f, "{}}}", indent)
                 }
             }
-
             Stmt::Assign { name, value } => {
                 if ctx.config.compact {
                     let value_str =
@@ -321,7 +318,6 @@ impl PrettyPrint for Stmt {
                     write!(f, "{}}}", indent)
                 }
             }
-
             Stmt::Return { expression } => {
                 if ctx.config.compact {
                     let expr_str =
@@ -335,7 +331,6 @@ impl PrettyPrint for Stmt {
                     write!(f, "{}}}", indent)
                 }
             }
-
             Stmt::Block { statements } => {
                 if ctx.config.compact {
                     write!(f, "{{ ... ({} statements) }}", statements.len())
@@ -355,7 +350,6 @@ impl PrettyPrint for Stmt {
                     write!(f, "{}}}", indent)
                 }
             }
-
             Stmt::If {
                 condition,
                 then_branch,
@@ -410,8 +404,27 @@ impl PrettyPrint for Stmt {
                     write!(f, "{}}}", indent)
                 }
             }
-
             Stmt::Stmt { expression } => expression.pretty_print(ctx, f),
+            Stmt::While { condition, body } => {
+                write!(f, "{}while (", ctx.child_context(true).indent())?;
+                condition.pretty_print(&ctx.child_context(true), f)?;
+                writeln!(f, ") {{")?;
+                body.pretty_print(&ctx.child_context(true), f)?;
+                writeln!(f, "{}}}", ctx.child_context(true).indent())
+            }
+            Stmt::For {
+                variable,
+                iterable,
+                body,
+            } => {
+                write!(f, "{}for (", ctx.child_context(true).indent())?;
+                variable.pretty_print(&ctx.child_context(true), f)?;
+                write!(f, " in ")?;
+                iterable.pretty_print(&ctx.child_context(true), f)?;
+                writeln!(f, ") {{")?;
+                body.pretty_print(&ctx.child_context(true), f)?;
+                writeln!(f, "{}}}", ctx.child_context(true).indent())
+            }
         }
     }
 }