feat: Ghost Shell v2 — AGS v3 statusbar + violet-chaton v2 palette

- AGS v3.1.0 (Astal/GTK3) Ghost Shell avec ghost mode (heartbeat + hover reveal)
- Modules : clock, battery, volume (interactif), network, MPRIS, CPU/RAM, systray
- Brain Power panel (Super + B) — lecture live focus/todos/session
- tetardtek_ prompt avec curseur clignotant
- Palette violet-chaton v2 documentée (Mitsuri Kanroji gradient magenta → green)
- Autostart COSMIC via .desktop
- Archive AGS v1 conservée pour référence

palette/violet-chaton-v2.md

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+# violet-chaton v2 — Palette Reference
+
+> Mitsuri Kanroji inspired gradient magenta → green
+> Created by Tetardtek — 2026
+
+## Colors
+
+### Backgrounds
+| Name | Hex | Usage |
+|------|-----|-------|
+| crust | `#1a0e27` | Deepest background, panels heavy glass |
+| base | `#261537` | Primary background, bar glass |
+| mantle | `#341c4a` | Elevated surfaces |
+| surface0 | `#3d2454` | Input backgrounds, troughs |
+| surface1 | `#493161` | Hover states, subtle borders |
+| surface2 | `#5a3875` | Active states, dividers |
+
+### Accents
+| Name | Hex | Usage |
+|------|-----|-------|
+| magenta | `#ff4da6` | Primary accent — clock, battery, volume, borders, heartbeat |
+| lilac | `#c9a0ff` | Secondary accent — hover states, media, brain panel |
+| mitsuri | `#9adba8` | Green pastel — charging state, success, health good |
+| lavande | `#a4b4ff` | Blue-violet — date, CPU, network, info states |
+| champagne | `#e8c87a` | Warm gold — warnings, session info |
+| danger | `#f25c7a` | Red-pink — errors, low battery, disconnected |
+
+### Text
+| Name | Hex | Usage |
+|------|-----|-------|
+| text | `#f0eaf8` | Primary text |
+| subtext1 | `#c4b8d4` | Secondary text, todo items |
+| subtext0 | `#9a8fad` | Tertiary text |
+| muted | `#716686` | Disabled, placeholders, empty states |
+
+## Font
+- **Primary**: Maple Mono NF (cursive italics)
+- **Size**: 13px bold (bar), 14px 900 (clock, prompt)
+- **Icons**: Nerd Font glyphs from Maple Mono NF
+
+## Signature Visual Elements
+- Glassmorphism: `rgba(38, 21, 55, 0.88)` (base @ 88%)
+- Heavy glass: `rgba(26, 14, 39, 0.94)` (crust @ 94%)
+- Border accent: `3px solid rgba(255, 77, 166, 0.60)` (magenta @ 60%)
+- Hover glow: `box-shadow: 0 4px 28px rgba(201, 160, 255, 0.18)` (lilac @ 18%)
+- Gradient progress: `linear-gradient(to right, magenta, lilac, lavande, mitsuri)`
+- Heartbeat: gradient `magenta 0% → magenta 60% → lilac 80% → magenta 60% → magenta 0%`
+- Border radius: 14px (pills), 8px (buttons)
+
+## SCSS Variables
+```scss
+$crust:     #1a0e27;
+$base:      #261537;
+$mantle:    #341c4a;
+$surface0:  #3d2454;
+$surface1:  #493161;
+$surface2:  #5a3875;
+$magenta:   #ff4da6;
+$lilac:     #c9a0ff;
+$mitsuri:   #9adba8;
+$lavande:   #a4b4ff;
+$champagne: #e8c87a;
+$danger:    #f25c7a;
+$text:      #f0eaf8;
+$subtext1:  #c4b8d4;
+$subtext0:  #9a8fad;
+$muted:     #716686;
+```