Fit the compaction description on one line

At 80 columns the description zone gives impact exactly one wrapped
line with no truncation marker, so the previous sentence silently
cut off before "output" — the exact fact the copy exists to state.
Shortened it so the cost difference and the strip-in-kept-turns
behaviour both survive at the harness's default width.

Author: TheGreatAxios

src/tui-opentui/command-surfaces.ts

@@ -300,7 +300,7 @@ function settingsCycleRows(
       describe: {
         what: "how the transcript is trimmed once the context fills.",
         impact:
-          "summarize (default) spends a call; drop is free but also strips tool output.",
+          "summarize (default) costs a call; drop is free but strips output too.",
         tone: "consequence",
       },
       cycle: (dir) =>