Double the assistant dot, and stop the checks measuring it against itself

26 → 52px, 14 → 28px for the sparkle. The audit page draws 26 ("26×26 · không
chữ, không chevron"); doubled at the user's request. Still half the area of the
84×64 button it replaced: 2704 vs 5376px².

Four checks pinned the old number. Three now read the size the design actually
claims rather than a literal — square, at least 24px to hit, and smaller than
what it replaced — and check_design_parity records the deviation in its item
label instead of scoring 52px against a 26px expectation.

The fourth attempt was worse than the literal: I had check_layout_geometry
import _DOT and compare against it, which makes it unfailable — change the
constant and the expectation moves too. check_probes_bite caught that, reporting
that doubling _DOT again left the checker green. It now bounds the range
(24..64, square), which the mutation does break.

24/24 checkers pass; check_multi_screen took the teardown segfault once in three
standalone runs.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

tools/check_help_dock.py

@@ -53,9 +53,15 @@ def main() -> int:
     area_new, area_old = closed.width() * closed.height(), OLD_W * OLD_H
     print(f"dien tich     : {area_new} vs {area_old}px2 "
           f"({100 - round(area_new / area_old * 100)}% nho hon)")
-    if closed.width() > 30 or closed.height() > 30:
-        fails.append(f"nut dong van {closed.width()}x{closed.height()}, cho <=30")
-    # 26px clears the ~24px comfortable-tap floor the old 18px chevron missed.
+    # The page draws 26px; the user asked for double. Read the size the module
+    # declares rather than a number written here, so the two cannot drift, and
+    # keep the two things that actually matter: it is a square chip, and it is
+    # still far smaller than the button it replaced.
+    if closed.width() != closed.height():
+        fails.append(f"nut dong khong vuong: {closed.width()}x{closed.height()}")
+    if area_new >= area_old:
+        fails.append(f"khong con nho hon nut cu: {area_new} vs {area_old}px2")
+    # clears the ~24px comfortable-tap floor the old 18px chevron missed
     if min(closed.width(), closed.height()) < 24:
         fails.append("vung bam nho hon 24px")