feat(theme): update Hanmac Green and Brown palette steps

Seven shared Hanmac color tokens change:
- Green Default #123328 -> #164434, Dark 1 #0a221d -> #11372d,
  Dark 2 #071e18 -> #0b2b23, Dark 3 #020a07 -> #030e0a
- Brown Default #3e3523 -> #4e422d, Dark 1 #352d1d -> #403726,
  Dark 3 #1d1810 -> #0d0b07

Updates primitives.css, the generated default values, themes/default.json,
the verification baseline and the hard-coded Default expectations in the
theme Stories and the quality-reference script. --hm-sem-on-accent is
intentionally unchanged. check:theme-defaults reports generated outputs match.

packages/ui/src/theme/primitives.css

@@ -5,14 +5,14 @@
   --hm-green-light-3: #249473;
   --hm-green-light-2: #266651;
   --hm-green-light-1: #205241;
-  --hm-green-default: #123328;
-  --hm-green-dark-1: #0a221d;
-  --hm-green-dark-2: #071e18;
+  --hm-green-default: #164434;
+  --hm-green-dark-1: #11372d;
+  --hm-green-dark-2: #0b2b23;
 
   --hm-brown-light-2: #897445;
   --hm-brown-light-1: #604f32;
-  --hm-brown-default: #3e3523;
-  --hm-brown-dark-1: #352d1d;
+  --hm-brown-default: #4e422d;
+  --hm-brown-dark-1: #403726;
 
   --hm-brown-light-4: #ecd4a2;
 
@@ -47,10 +47,10 @@
 
 /* Confirmed brand palette additions (ui_viz Color 4.1; Orange Dark 1/2 confirmed by user 2026-10-11). */
 :root {
-  --hm-green-dark-3: #020a07;
+  --hm-green-dark-3: #030e0a;
   --hm-brown-light-3: #c1a770;
   --hm-brown-dark-2: #2f281c;
-  --hm-brown-dark-3: #1d1810;
+  --hm-brown-dark-3: #0d0b07;
   --hm-orange-light-3: #ec8f53;
   --hm-orange-light-2: #f87725;
   --hm-orange-light-1: #eb5f00;