e2e checks follow the new theme instead of fixed sizes (#202)

The suite job for 0d20776 died in module 06. The new font and theme
moved the layout, and three checks relied on the old one.

- 06: the ranking step right-clicked the spot where step 6d had just
  dropped a Log node. Whether that click hits the node depends on how
  the layout snaps it. It now asks for a fresh empty spot.
- 14 and 27 expected a shut panel to keep 30 px. The header is
  Theme.rowHeight + 4, now 26. A new hook __gm.panelHeader hands the
  checks the real height, so the next theme change does not break
  them again.

Tests:
- ./check.sh: 141 files, 2080 tests, exit 0
- Local full run before the fix: 06 passed with the new spot, only the
  three header checks in 14 and 27 failed.
- GM_STEPS=1-14,27 after the fix: ALL PASSED, 457 checks
- No new checks, the total stays at 1286.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/editor/debugHook.ts

@@ -14,6 +14,7 @@ import {
   Button,
   currentMenu,
   isRendering,
+  Panel,
   renderCount,
   requestRender,
   ui,
@@ -215,6 +216,8 @@ export function installDebugHook(app: Application, state: EditorState, editor: E
       const widget = ui().focus.focused;
       return widget ? rectOf(widget) : null;
     },
+    /** What a panel dragged shut keeps: its header. Follows the theme, so checks need not. */
+    panelHeader: Panel.HEADER_HEIGHT,
     inspectorInfo: () => inspector.debugInfo(),
     textColor,
     overlayTexts,