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.

agent/HARDWARE-QUEUE.md

@@ -8,6 +8,10 @@ the failure as a NOW bug in BACKLOG.md. Machines: the **AMD dev box**
 QA machine), the **T14s** (webcam case).
 
 ## Any machine (dev box is fine)
+- [ ] **Charge-limit live apply (2026-07-10)** — on a laptop with
+      `charge_control_end_threshold`: System › Battery limit → 80%;
+      confirm `cat …/charge_control_end_threshold` is 80 without rebuild;
+      unplug/replug AC, confirm still 80 (oneshot). User in `users` group.
 - [ ] **#41 float classes (polkit / pinentry / portal / blueman)** — after
       rebuild: (1) `pkexec true` or mount a disk → polkit dialog should
       float+center; if not, note `hyprctl clients` class while open.