Format luxuryCar.js and apply minor syntax fixes

Reformat assets/js/luxuryCar.js for consistent style and fix minor syntax issues: normalize spacing in function expressions and callbacks, add trailing commas to object/array literals, reformat long expressions (createSlug, price parsing), and tidy promise chaining/indentation for fetch calls. Also adjusted several event handler and setTimeout declarations, and updated the file header comment. No behavioral logic changes intended — changes are primarily stylistic and whitespace/syntax cleanup.

Author: SharkJohny