Refactor codebase for consistency and readability

- Standardize array and vector formatting for clarity.
- Adjust spacing and indentation in examples and TUI code.
- Ensure proper newline usage across files (e.g., LICENSE, TOML files, etc.).
- Simplify `.to_string()` and `.ok()` calls for brevity.

examples/session_management.rs

@@ -23,6 +23,8 @@ fn main() {
     println!("\nSession cleared.");
 
     let messages_after_clear = session.get_messages();
-    println!("Messages in session after clear: {}", messages_after_clear.len());
+    println!(
+        "Messages in session after clear: {}",
+        messages_after_clear.len()
+    );
 }
-