refactor: govern CSS tokens and cascade

docs/governance/architecture-inventory.json

@@ -244,6 +244,7 @@
     }
   ],
   "css_layers": [
+    "/shared/tokens.css?v=20260729-1",
     "/styles.css",
     "/renovation.css?v=20260725-5",
     "/redesign-v2.css?v=20260728-1",
@@ -259,23 +260,23 @@
     },
     {
       "path": "static/styles.css",
-      "bytes": 364385,
-      "lines": 15549
-    },
-    {
-      "path": "static/redesign-v2.css",
-      "bytes": 264960,
-      "lines": 8616
+      "bytes": 361780,
+      "lines": 15465
     },
     {
       "path": "server.py",
       "bytes": 263744,
       "lines": 5856
     },
+    {
+      "path": "static/redesign-v2.css",
+      "bytes": 263539,
+      "lines": 8570
+    },
     {
       "path": "static/index.html",
-      "bytes": 133815,
-      "lines": 1875
+      "bytes": 133880,
+      "lines": 1876
     },
     {
       "path": "database.py",
@@ -294,8 +295,8 @@
     },
     {
       "path": "static/renovation.css",
-      "bytes": 86245,
-      "lines": 1636
+      "bytes": 83949,
+      "lines": 1553
     },
     {
       "path": "static/wentian-v2.css",
@@ -309,8 +310,8 @@
     },
     {
       "path": "static/theme.css",
-      "bytes": 41279,
-      "lines": 1407
+      "bytes": 36427,
+      "lines": 1253
     }
   ]
 }