fix(tags): overlay vim status bar on editor instead of reserving space
The vim status line in the tags embedded editor was always reserving
vertical space at the bottom, even when hidden. This made the editor
shorter than it needed to be.
Changed the status line to use position: absolute to overlay the bottom
of the editor. When vim mode is off, the status line is hidden and the
editor uses 100% of available height. When vim mode is on, the status
bar appears overlaid at the bottom of the editor area.
Removed the has-vim-status class toggling since it's no longer needed
for corner radius adjustments with the overlay approach.