feat(theme): make Boreal the distro default

Seed theme-state.json and the downstream template from themes/boreal.json
(including border + empty settings). Point eval/schema fallbacks at Boreal
(theme.nix preset, plymouth and live-ISO splash colors, theme-shot, sync
error examples). Docs/TESTING and RECOVERY follow the new default.

Verified: state matches boreal palette; theme-contrast all pass.
preview.png for boreal still missing (picker plain-name; V3 capture).

templates/downstream/theme-state.json

@@ -1,55 +1,61 @@
 {
   "version": 1,
-  "name": "Tokyo Night",
-  "slug": "tokyo-night",
+  "name": "Boreal",
+  "slug": "boreal",
   "mode": "dark",
   "wallpaper": "",
   "colors": {
-    "base": "#1a1b26",
-    "mantle": "#161720",
-    "surface": "#32344a",
-    "overlay": "#444b6a",
-    "text": "#a9b1d6",
-    "subtext": "#787c99",
-    "muted": "#444b6a",
-    "accent": "#7aa2f7",
-    "accentAlt": "#ad8ee6",
-    "good": "#9ece6a",
-    "warn": "#e0af68",
-    "bad": "#f7768e"
+    "base": "#21272F",
+    "mantle": "#1A1F26",
+    "surface": "#303A46",
+    "overlay": "#404D5C",
+    "text": "#D3DAE0",
+    "subtext": "#97A3B2",
+    "muted": "#5E6A78",
+    "accent": "#B79BE8",
+    "accentAlt": "#86C7C0",
+    "good": "#A3CF88",
+    "warn": "#E6C384",
+    "bad": "#E2818A"
+  },
+  "border": {
+    "active": "accent",
+    "inactive": "overlay"
   },
   "ansi": [
-    "#32344a",
-    "#f7768e",
-    "#9ece6a",
-    "#e0af68",
-    "#7aa2f7",
-    "#ad8ee6",
-    "#449dab",
-    "#787c99",
-    "#444b6a",
-    "#ff7a93",
-    "#b9f27c",
-    "#ff9e64",
-    "#7da6ff",
-    "#bb9af7",
-    "#0db9d7",
-    "#acb0d0"
+    "#2E3742",
+    "#E2818A",
+    "#A3CF88",
+    "#E6C384",
+    "#86A9E0",
+    "#B79BE8",
+    "#86C7C0",
+    "#D3DAE0",
+    "#5E6A78",
+    "#EC98A0",
+    "#B4DB9C",
+    "#EFCF98",
+    "#9DBBEC",
+    "#C6AEEF",
+    "#99D6CF",
+    "#E8EDF2"
   ],
   "fonts": {
-    "mono": "JetBrainsMono Nerd Font",
+    "mono": "GeistMono Nerd Font",
     "ui": "Inter",
     "size": 11
   },
   "ui": {
-    "gapsIn": 5,
-    "gapsOut": 12,
-    "borderSize": 2,
-    "rounding": 10,
+    "gapsIn": 6,
+    "gapsOut": 14,
+    "borderSize": 3,
+    "rounding": 12,
+    "iconSize": 44,
     "activeOpacity": 1.0,
-    "inactiveOpacity": 0.95,
-    "terminalOpacity": 0.96,
+    "inactiveOpacity": 0.93,
+    "terminalOpacity": 0.9,
     "blur": true,
     "shadow": true
-  }
+  },
+  "settings": {}
 }