fix(tags): remove editor focus ring and visually connect vim status bar
Remove the blue focus border on the embedded CodeMirror editor in the
tags detail pane — it looked odd since the vim status bar sat outside it.
Change the vim status bar from absolute positioning to normal flex flow
(order: 2) so it renders below the editor as a continuous container.
The editor's bottom corners flatten when vim mode is active, and the
status bar picks up matching border/background styling. When vim mode
is off, the status bar container is hidden and the editor retains its
full border-radius.