style(ui): simplify panels, remove borders and scrollbars, add padding, enable inline mode

television/cable/env.toml

@@ -11,7 +11,7 @@ command = "echo '{split:=:1..}'"
 
 [ui]
 layout = "portrait"
-preview_panel = { size = 20, header = "{split:=:0}" }
+preview_panel = { size = 20, header = "{split:=:0}", border_type = "none", scrollbar = false, padding = { left = 2, right = 1, top = 0, bottom = 0 } }
 
 [keybindings]
 shortcut = "f3"