upgrade: adopt V8.31.1 (theme 1.3/1.4 redesigns, editor deep-canvas, guided launch, component library)

Overlay 190 upstream items (V8.22→8.31) preserving trade-pro theme,
registry tests, and design docs. Re-applied full patch set on identical
anchors (discovery/env_for/blocks.css/type-mapping/locale-override/
theme_color/frontend entries/test_theme_pro_v3 mods) plus compose pins.

Verified: theme suites 35/35; dual-baseline full run 415 passed vs
pristine 386+29 ours, FAILED-set diff EMPTY (same 10 Windows env fails).
Live: container 8.31.1-dev.1 healthy, hesupipe 192 entries intact,
trade-pro build 203 pages 0 errors.

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

scripts/regression_v829.py

@@ -0,0 +1,27 @@
+"""V8.29 isolated regression with per-batch deadline and raw logs."""
+import argparse,datetime,json,subprocess,sys,time
+from pathlib import Path
+ROOT=Path(__file__).resolve().parents[1]
+def main():
+    ap=argparse.ArgumentParser();ap.add_argument('--timeout',type=int,default=50);ap.add_argument('--group-size',type=int,default=3);args=ap.parse_args()
+    all_files=sorted((ROOT/'tests').glob('test_*.py'))
+    groups=[all_files[i:i+args.group_size] for i in range(0,len(all_files),args.group_size)]
+    dest=ROOT/'reports/v829-regression';dest.mkdir(parents=True,exist_ok=True)
+    outcomes=[]
+    for index,files in enumerate(groups,1):
+        start=time.monotonic();command=[sys.executable,'-m','pytest','-q',*[str(f.relative_to(ROOT)) for f in files]]
+        try:
+            proc=subprocess.run(command,cwd=ROOT,capture_output=True,text=True,timeout=args.timeout)
+            code=proc.returncode;output=proc.stdout+'\n'+proc.stderr;status='passed' if code==0 else 'failed'
+        except subprocess.TimeoutExpired as e:
+            output=(e.stdout or b'').decode(errors='replace') if isinstance(e.stdout,bytes) else (e.stdout or '')
+            output+='\nTIMEOUT exceeded';status='timeout'
+        elapsed=round(time.monotonic()-start,2)
+        (dest/f'batch-{index:02}.log').write_text(output,encoding='utf-8')
+        outcomes.append({'batch':index,'files':[f.name for f in files],'status':status,'seconds':elapsed,'summary':output[-350:]})
+        print(f'[{index:02}/{len(groups)}] {status.upper()} {elapsed:.1f}s: '+', '.join(f.name for f in files),flush=True)
+    result={'version':'8.31.0-dev.1','generated_utc':datetime.datetime.now(datetime.timezone.utc).isoformat(),'groups':outcomes,'all_passed':all(x['status']=='passed' for x in outcomes)}
+    (dest/'result.json').write_text(json.dumps(result,ensure_ascii=False,indent=2),encoding='utf-8')
+    print('RESULT:',result['all_passed'],sum(x['status']=='passed' for x in outcomes),len(groups),flush=True)
+    return 0 if result['all_passed'] else 1
+if __name__=='__main__':raise SystemExit(main())