upgrade: adopt V8.32.0-dev.1 (theme preview iframe fix, editor simple mode)

Overlay 46 upstream items; full patch set re-applied (all patched files
reset by overlay regardless of upstream change status — lesson recorded).
Verified: theme suites 35/35; dual-baseline 418 passed vs pristine
389+29 ours, FAILED-set diff EMPTY (same 10 Windows env fails).
Live: container 8.32.0-dev.1 healthy, hesupipe 192 entries intact,
trade-pro build 203 pages 0 errors.

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

app/theme_pro.py

@@ -21,11 +21,7 @@ LOADER=Environment(loader=FileSystemLoader(str(ROOT/'themes')),autoescape=select
 _ENVS={}
 
 def env_for(theme):
-    """Per-theme Jinja env: theme dir first, shared themes/ root as fallback.
-
-    Lets a theme override shared macros (_professional_components.html) while
-    inheriting everything else. Cached per theme; degraded envs are not cached.
-    """
+    """Per-theme Jinja env: theme dir first, shared themes/ root as fallback."""
     if theme not in THEMES:raise ValueError('未知主题')
     env=_ENVS.get(theme)
     if env is None: