Add some simple features to a simple php application.

Description

I have a really basic php application which is used for managing stock within my storage unit. The application accepts text entered into a text entry field and writes it to a DB. The information entered is proportional to a product barcode, a bin number and a bin location. At the moment, there's a separate text entry field for each type of data and the user must manually move the cursor (using the mouse) between the text entry fields which (for example) changing between entering a product barcode and changing bin number.
The changes you make will allow the user to switch focus between the text entry fields by typing in a code. For example, if the cursor is in the "product barcode" field and the user wants to switch to the "bin number" field, the user types a code like "£=bin" and the cursor switches to the "enter bin number" text entry field.
Budget for this is £30. Magic word is "racecar" and please don't copy-paste a proposal and especially, please don't use ChatGPT to generate a proposal (I'll know), I'd rather suffer your bad English than have to suffer the insult of an AI generated response.
You'll have FTP access to the web directory (I'll need to add your IP address to the whitelist) and logins for phpMyAdmin if you need to access the DB.