* Replace all 4 instances of jBox-style modal dialog boxes with HTML dialog element
Notes:
- The Power & Battery (2), OSD, and CLI tabs have been updated accordingly
- HTML default control behavior was used whereever possible
- HTML indent for the dialog tag is deliberately off to minimize diff noise in GitHub
- Layout is not 100% identical, but spiratually the same - in most cases no changes were needed
- OSD’s Font Manager dialog didn’t transition cleanly, so includes some slight restyling
- OSD Font Manager previously had a green background/color for the graphic - that “just works” now
- Specific cleanup (i.e., calling destroy()) does not seem necessary and was removed
- Removal of jBox from setup.js and global scope seems not to affect jBox tooltips
- Replacement of single quotes with double in main.js was done automatically by Prettier
* Fix unclickable "Select custom image..." button in OSD tab due to overlapping layout; replace with CSS grid.
* Update OSD's Font Manager dialog to not have scroll bars by default (PR feedback).
* Update OSD's Font Manager dialog to remove overflow-y:scroll in order to avoid even a disabled scroll bar on some platforms/browsers (PR feedback).
