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.

themes/default_light.toml

@@ -20,4 +20,4 @@ selection_fg = "black"
 cursor = "#d95f02"
 placeholder = "gray"
 error = "#c0392b"
-info = "green"
+info = "green"

themes/material-light.toml

@@ -20,4 +20,4 @@ selection_fg = "#212121"
 cursor = "#c2185b"
 placeholder = "#90a4ae"
 error = "#d32f2f"
-info = "#388e3c"
+info = "#388e3c"