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-vivaldi.json

@@ -4,20 +4,20 @@
     "accentOnWindow": true,
     "accentSaturationLimit": 1,
     "alpha": 1,
-    "backgroundImage": "/resources/bg_pawel-czerwinski-Xk7ktUfyaNI-unsplash.webp",
+    "backgroundImage": "",
     "backgroundPosition": "stretch",
     "backgroundSource": "",
     "blur": 0,
-    "colorAccentBg": "#2c183e",
-    "colorBg": "#341c4a",
-    "colorFg": "#d3d9e3",
-    "colorHighlightBg": "#b68fdc",
-    "colorWindowBg": "#1D1E21",
+    "colorAccentBg": "#1a0e27",
+    "colorBg": "#261537",
+    "colorFg": "#f0eaf8",
+    "colorHighlightBg": "#c9a0ff",
+    "colorWindowBg": "#1a0e27",
     "contrast": 0,
     "dimBlurred": false,
     "engineVersion": 1,
     "id": "11455bed-3b48-4de5-9a03-a83a1b4be775",
-    "name": "Rice Violet-Chaton",
+    "name": "Violet-Chaton v2",
     "preferSystemAccent": false,
     "radius": 14,
     "simpleScrollbar": true,