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>

tests/test_editor_easy_v8212.py

@@ -18,8 +18,9 @@ def test_editor_add_and_direct_canvas_selection():
     api=(ROOT/'app/main.py').read_text()
     for method in ('toggleLibrary(force)','updateGuidance()','showHelp()','select(i)','arrayEditor(field,value,type)','itemField(field,index,key,value)','addItem(field)','removeItem(field,index)','moveItem(field,index,by)'):
         assert method in js
-    assert "siteforge-select-block" in js
-    assert "siteforge-select-block" in api
+    assert "siteforge-studio-canvas" in js
+    assert "studio-canvas-bridge.js" in api
+    assert "safeCanvasCommand" in js
     assert 'event.source!==frame.contentWindow' in js
     assert "studio-draft/publish" in js
     assert 'expected_revision' in js
@@ -30,4 +31,4 @@ def test_no_change_to_block_blueprint_or_database_schema():
     assert demo.exists()
     assert '演示操作不会修改正式网站' in demo.read_text()
     from app.version import VERSION
-    assert VERSION.startswith('8.21.') and VERSION.endswith('-dev.1')
+    assert VERSION.startswith('8.') and VERSION.endswith('-dev.1')