fix: preserve terminal background between bar elements

src/main.rs

@@ -43,6 +43,7 @@ Navigation:
   Enter on the connected database collapses/expands it without reconnecting.
   Navigation help has its own bordered pane and wraps when needed.
   Full-width bars show dbdash/provider/READ ONLY above and mode/database below.
+  Only badges have colored backgrounds; the remaining bar area uses terminal defaults.
   Focused inputs show one-based line:column (Unicode characters, not screen cells).
   The query editor sits above rows/results; the explorer spans both panes.
   Explorer and rows/schema bottom borders align; relation/page/column status