feat(tokens): add Carbon Blue dark-surface tokens; fix theme.json presets

styles/base/colors.css

@@ -32,10 +32,32 @@
   --color-bodylinks: oklch(0.48 0.0789 211.58);
   --color-footlinks: oklch(0.65 0.1104 212.2);
 
-  --color-success:   oklch(64.01% 0.1751 146.7);
-  --color-info:      oklch(0.55 0.0922 211.57);
-  --color-warning:   oklch(84.42% 0.1722 84.93);
-  --color-danger:    oklch(0.5126 0.1865 22.61);
   --color-light:     oklch(98.16% 0.0017 247.8);
   --color-dark:      oklch(34.51% 0.0133 248.2);
+
+  /* Carbon Blue / dark surface tokens (Portfolio 2026) */
+  --color-surface:           #121318;
+  --color-surface-dim:       #121318;
+  --color-surface-bright:    #38393f;
+  --color-surface-container-lowest: #0d0e13;
+  --color-surface-container-low:    #1a1b21;
+  --color-surface-container:        #1e1f25;
+  --color-surface-container-high:   #292a2f;
+  --color-surface-container-highest:#34343a;
+  --color-on-surface:        #e3e1e9;
+  --color-on-surface-variant:#c5c5d3;
+  --color-outline:           #8f909d;
+  --color-outline-variant:   #444651;
+  --color-page-base:         #100e0b;
+  --color-backlight:         rgba(96, 165, 250, 0.20);
+
+  --color-primary-fixed:        #dce1ff;
+  --color-primary-fixed-dim:    #b6c4ff;
+  --color-on-primary-fixed:     #00164e;
+  --color-on-primary-fixed-variant: #264191;
+
+  --color-success: #5ccf91;
+  --color-warning: #f4e04d;
+  --color-danger:  #cc3b3b;
+  --color-info:    #3d7ab0;
 }

theme.json

@@ -67,6 +67,31 @@
                     "slug": "theme-info",
                     "color": "var(--color-info)",
                     "name": "Theme Info"
+                },
+                {
+                    "slug": "theme-surface",
+                    "color": "#121318",
+                    "name": "Theme Surface"
+                },
+                {
+                    "slug": "theme-on-surface",
+                    "color": "#e3e1e9",
+                    "name": "Theme On Surface"
+                },
+                {
+                    "slug": "theme-outline",
+                    "color": "#8f909d",
+                    "name": "Theme Outline"
+                },
+                {
+                    "slug": "theme-outline-variant",
+                    "color": "#444651",
+                    "name": "Theme Outline Variant"
+                },
+                {
+                    "slug": "theme-page-base",
+                    "color": "#100e0b",
+                    "name": "Theme Page Base"
                 }
             ]
         },
@@ -165,8 +190,8 @@
     },
     "styles": {
         "color": {
-            "background": "var(--wp--preset--color--background)",
-            "text": "var(--wp--preset--color--text)"
+            "background": "var(--wp--preset--color--theme-bg, #100e0b)",
+            "text": "var(--wp--preset--color--theme-text, #e3e1e9)"
         },
         "elements": {
             "link": {