Banner improvements

[ericahan22]

Uncaught RangeError: Invalid time value
    at FR (index-BUmWmwvw.js:322:19336)
    at C8 (index-BUmWmwvw.js:322:30905)
    at U7 (index-BUmWmwvw.js:322:31068)
    at s3e (index-BUmWmwvw.js:380:128685)
    at nl (index-BUmWmwvw.js:48:48292)
    at wl (index-BUmWmwvw.js:48:71158)
    at Uy (index-BUmWmwvw.js:48:68559)
    at Iy (index-BUmWmwvw.js:48:68107)
    at Yy (index-BUmWmwvw.js:48:83964)
    at Eb (index-BUmWmwvw.js:48:117415)

happens when the date isn't properly formatted in the banner.

Possible solution: add banner management tool on admin side where you can enter a date from a date picker to prevent typos.

This solution would also mean that we wouldn't have to make code changes when updating the banner.

Also {formatEventDate("2026-01-26")} shows up as Sunday, Jan 25.

And the old code didn't throw an error on my phone for some odd reason