crash: show and verify the revealed seed in the TUI and GUI

The crash board gained a fairness line: the short commit while the round runs, then the short seed marked verified when sha256(seed) and the recomputed crash point both match. The terminal board grew from six to seven lines and the GUI sidebar shows the same values.

1 files changed, 2 insertions, 0 deletions

diff --git a/docs/TESTING.md b/docs/TESTING.md
index fbd510b..141ea75 100644
--- a/docs/TESTING.md
+++ b/docs/TESTING.md
@@ -225,6 +225,8 @@ terminal client; a saved login from one signs in the other.
    and `sha256(seed) == commit`; recompute the crash point from the seed.
 8. Confirm `CRASH_BUSTED` is an `EVT`, not a `RES`, and that a second poll
    produces no repeated settlement.
+9. The board's fairness line shows the short commit while running, then the
+   short seed and `verified` after the reveal (TUI and GUI).
 
 ## Manual restart check