Enhancements to JavaScript Web Application -- 2

A programmer created this app to my specification. Using it since its completion has revealed opportunities for improvement, and I need a JavaScript programmer / Web Designer to refine the app. The app is at: [login to view URL] A description is on a Facebook post, but the video has no audio. The video file (with audio) is linked separately. [login to view URL] The video file is too big to attach to freelancer.com posts, so it is linked here: [login to view URL]!AkRGeOB9jngnvwAdMWNAbJWdxLFR?e=zkZx7T The code can be read at: [login to view URL] Give it a try. Please attach a screen-shot of a project you created in the FiveDown app. A simple 5-element worksheet similar to the one in the example video will be fine. Also, provide me a non-binding estimate of how many hours you need to perform the described work. I was just informed that proposers are not allowed to attach screenshots, so instead you can provide a link to a screenshot hosted on the web somewhere, or just cut-and-paste the json from your test project. The desired enhancements are: + save order and width of columns + make row-delete a menu option in addition to keystroke. this makes app more usable on tablets. + make cell editable (with visible cursor) on selection. now, the cell can be active, but shows no evidence of holding focus + make second row labels, frozen from scrolling 'alt 1', 'alt 2', etc is not very descriptive. + make left columns frozen to 'definition' column + auto-add blank lines at end of sheet. now, user must explicitly add blank rows by clicking button. + make blank lines actually blank, not '0' + make bad-formulas into comments, not erased if formula entered that errors, make it a text value, for fixing later. + auto-generate names, in lieu of erroring + allow deletion of alt- columns + allow over-riding of calculated value with data value. format yellow. so the definition provides a default value, and the value can be over-ridden for a specific alt- column. + add a page that describes the functionality + add a reference page with all of the supported functions