feat: violet-chaton v2 — palette originale, kitty, AGS, Maple Mono NF

Refonte complete du rice. Palette 100% originale (Mitsuri Kanroji inspired),
zero emprunt Dracula/Catppuccin. 50 fichiers, 3200+ lignes.

Palette v2:
- palette.sh source de verite unique (dark + light)
- 5 accents (magenta, lilac, mitsuri, lavande, champagne)
- 4 semantiques derivees, 4 niveaux texte, 6 fonds
- Gradient signature: magenta → lilac → lavande → mitsuri
- Variante Light: fonds lavande, accents assombris WCAG

Terminal:
- kitty (remplace COSMIC Term comme principal)
- Maple Mono NF (cursive italics, ligatures)
- Cursor trail magenta, splits/layouts tiling, undercurl
- Vi-mode zsh avec cursor shape adaptatif

Shell:
- starship 3 lignes (palette nommee, brain_name, battery, sudo)
- zshrc v2 (nouveaux outils, fzf pimp, shell functions, vi-mode)
- Commandes custom: proj, glog, fkill, colors, hotkeys, weather, y

Desktop:
- AGS config (bar 3-pills, OSD gradient, launcher, notifications)
- COSMIC Dark + Light v2 (7 fichiers RON chacun)
- COSMIC Term v2 (color schemes dark/light, Maple Mono NF)
- GTK3/GTK4 dark + light css
- Vivaldi theme v2

Outils:
- +kitty +dust +procs +tokei +sd +hyperfine +gping +Maple Mono NF
- Propagation palette sur: bat, btop, cava, yazi, lazygit, rofi,
  delta, fastfetch, atuin, ls-colors, vivaldi
- Claude Code statusline brain-aware

Docs:
- README v2 complet (palette, structure, raccourcis, commandes)
- help.md v2 (reference exhaustive)

INSTALL/themes/violet-chaton-atuin.toml

@@ -1,10 +1,10 @@
-# violet-chaton — thème atuin
+# violet-chaton v2 — theme atuin
 # Les valeurs sont des noms de couleurs CSS (palette crate)
 
-Base      = "white"           # texte principal       #f8f8f2
-Important = "hot_pink"        # éléments importants   #ff79c6
-Guidance  = "slate_gray"      # texte d'aide/muted    #7f849c
-Annotation = "orchid"         # labels/annotations    #e79cfe
-AlertInfo  = "light_cyan"     # info                  #8be9fd
-AlertWarn  = "pale_goldenrod" # avertissement         #f9e2af
-AlertError = "light_pink"     # erreur                #f38ba8
+Base       = "lavender_blush"   # texte principal     #f0eaf8
+Important  = "hot_pink"         # accent primaire     #ff4da6
+Guidance   = "medium_purple"    # texte aide/muted    #716686
+Annotation = "plum"             # labels/annotations  #c9a0ff
+AlertInfo  = "light_steel_blue" # info                #a4b4ff
+AlertWarn  = "goldenrod"        # warning             #e8c87a
+AlertError = "pale_violet_red"  # danger              #f25c7a