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/vantablack/btop.theme

@@ -1,70 +1,25 @@
-# Main background, empty for terminal default, need to be empty if you want transparent background
 theme[main_bg]="#0d0d0d"
-
-# Main text color
 theme[main_fg]="#ffffff"
-
-# Title color for boxes
-theme[title]="#9b9b9b"
-
-# Highlight color for keyboard shortcuts
-theme[hi_fg]="#b0b0b0"
-
-# Background color of selected item in processes box
-theme[selected_bg]="#333333"
-
-# Foreground color of selected item in processes box
+theme[title]="#ffffff"
+theme[hi_fg]="#8d8d8d"
+theme[selected_bg]="#2a2a2a"
 theme[selected_fg]="#ffffff"
-
-# Color of inactive/disabled text
 theme[inactive_fg]="#666666"
-
-# Misc colors for processes box including mini cpu graphs, details memory graph and details status text
+theme[graph_text]="#ececec"
+theme[meter_bg]="#1a1a1a"
 theme[proc_misc]="#9b9b9b"
-
-# Box outline and divider line color
-theme[cpu_box]="#b6b6b6"
+theme[cpu_box]="#8d8d8d"
 theme[mem_box]="#b6b6b6"
-theme[net_box]="#b6b6b6"
-theme[proc_box]="#b6b6b6"
-theme[div_line]="#fdfdfd"
-
-# Gradient for all meters and graphs
-theme[temp_start]="#b0b0b0"
-theme[temp_mid]="#8d8d8d"
-theme[temp_end]="#b6b6b6"
-
-
-theme[cpu_start]="#b0b0b0"
-theme[cpu_mid]="#8d8d8d"
-theme[cpu_end]="#b6b6b6"
-
-
-theme[free_start]="#8d8d8d"
-theme[free_mid]="#cecece"
-theme[free_end]="#cecece"
-
-
-theme[cached_start]="#cecece"
-theme[cached_mid]="#cecece"
-theme[cached_end]="#cecece"
-
-
-theme[available_start]="#b0b0b0"
-theme[available_mid]="#b0b0b0"
-theme[available_end]="#b0b0b0"
-
-
-theme[used_start]="#b6b6b6"
-theme[used_mid]="#b6b6b6"
-theme[used_end]="#b6b6b6"
-
-
-theme[download_start]="#cecece"
-theme[download_mid]="#b0b0b0"
-theme[download_end]="#8d8d8d"
-
-
-theme[upload_start]="#cecece"
-theme[upload_mid]="#b0b0b0"
-theme[upload_end]="#8d8d8d"
+theme[net_box]="#9b9b9b"
+theme[proc_box]="#1a1a1a"
+theme[div_line]="#2a2a2a"
+theme[temp_start]="#b6b6b6"
+theme[temp_mid]="#cecece"
+theme[temp_end]="#a4a4a4"
+theme[cpu_start]="#b6b6b6"
+theme[cpu_mid]="#cecece"
+theme[cpu_end]="#a4a4a4"
+theme[free_start]="#b6b6b6"
+theme[used_start]="#cecece"
+theme[download_start]="#8d8d8d"
+theme[upload_start]="#9b9b9b"