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>

reports/v830-regression/batch-16.json

@@ -0,0 +1,10 @@
+{
+  "batch": 16,
+  "modules": [
+    "test_v818_pg_recovery.py",
+    "test_v818_sqlite_pg_transfer.py"
+  ],
+  "status": "passed",
+  "elapsed": 2.97,
+  "summary": "...........                                                              [100%]\n11 passed in 0.52s\n\n"
+}