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_layout_geometry.py

@@ -4,7 +4,7 @@ Round 1 asks "does the feature exist". A screen can pass that and still be laid
 out wrongly — right widgets, wrong order, wrong side, wrong proportions. This
 round measures real geometry against what the audit page's wireframes depict:
 reading order of the rail, section order down Monitoring, which side each pane
-is on, and the size relationships the design calls out (hero card, 26px dot).
+is on, and the size relationships the design calls out (hero card, the dot).
 
 Run:  python tools/check_layout_geometry.py
 """
@@ -13,7 +13,7 @@ from __future__ import annotations
 import os
 import sys␍
 
-sys.stdout.reconfigure(encoding="utf-8", errors="replace")
+sys.stdout.reconfigure(encoding="utf-8", errors="replace")
 from pathlib import Path
 
 REPO = Path(__file__).resolve().parent.parent
@@ -41,7 +41,7 @@ def main() -> int:
     _load_fonts()
     _freeze_schedulers()
 
-    _apply_theme(app)   # measure the styled window, not a bare one
+    _apply_theme(app)   # measure the styled window, not a bare one
     from cowork_local.config import AppConfig, CONFIG_DIR
     assert str(sandbox) in str(CONFIG_DIR), f"isolation failed: {CONFIG_DIR}"
 
@@ -154,7 +154,7 @@ def main() -> int:
     if row2 <= row1:
         fails.append("4 the phu khong xep 2x2")
 
-    # --- 5. Cowork: the dot clears the composer, dot is 26px --------------
+    # --- 5. Cowork: the dot clears the composer, and is the declared size --
     win._goto(win._ROW_WORKSPACE, ws._cowork_tab_idx)
     for _ in range(8):
         app.processEvents()
@@ -163,8 +163,15 @@ def main() -> int:
     dock_bottom = top_of(dock, win) + dock.height()
     comp_top = top_of(comp, win)
     print(f"cham {dock.width()}x{dock.height()} · day y={dock_bottom} · o nhap dinh y={comp_top}")
-    if dock.width() > 30:
-        fails.append(f"cham tro ly rong {dock.width()}px, thiet ke la 26px")
+    # Reading _DOT and comparing against it makes this unfailable — change the
+    # constant and the expectation moves with it (check_probes_bite caught
+    # exactly that). Bound what the design actually claims instead: a square
+    # chip, big enough to hit, far smaller than the 84x64 button it replaced.
+    # 26px was drawn, 52px is what the user asked for; 64 is the ceiling past
+    # which "gọn" stops being true.
+    if not 24 <= dock.width() <= 64 or dock.width() != dock.height():
+        fails.append(f"cham tro ly {dock.width()}x{dock.height()}px, "
+                     f"cho o khoang 24..64 va phai vuong")
     if dock_bottom > comp_top:
         fails.append("cham tro ly de len o nhap")
     if left_of(dock, win) + dock.width() > win.width():