feat: live charge limit, identity retunes, btop assets (product calls)

- Charge limit: udev GROUP=users on threshold; menu applies sysfs live
  and persists state; boot/AC oneshot prefers live theme-state.json.
- Look & Feel: Reset wallpaper (auto); Theme/next/night light already there.
- NVIDIA first-class wrappers deferred past v1 (keep #59 comments).
- Identity taste: white, lumon, hackerman, matte-black, miasma.
- Hand btop.theme for identity + boreal/executive-slate/neon-glass.

Verified: V0 contrast; V1 battery-charge-limit VM. V3 live sysfs on laptop.

themes/hackerman.json

@@ -7,7 +7,7 @@
   "colors": {
     "base": "#0B0C16",
     "mantle": "#090a13",
-    "surface": "#0B0C16",
+    "surface": "#1a1c2e",
     "overlay": "#6a6e95",
     "text": "#ddf7ff",
     "subtext": "#85E1FB",
@@ -15,8 +15,8 @@
     "accent": "#82FB9C",
     "accentAlt": "#86a7df",
     "good": "#4fe88f",
-    "warn": "#50f7d4",
-    "bad": "#50f872"
+    "warn": "#e8d44f",
+    "bad": "#ff5a7a"
   },
   "border": {
     "active": "accent",