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

ags-v3/widget/modules/Network.tsx

@@ -0,0 +1,31 @@
+import AstalNetwork from "gi://AstalNetwork"
+import { createBinding } from "ags"
+
+export default function Network() {
+  const net = AstalNetwork.get_default()
+
+  const text = createBinding(net, "primary")((type: AstalNetwork.Primary) => {
+    if (type === AstalNetwork.Primary.WIFI) {
+      const wifi = net.wifi
+      if (!wifi) return "󰤮 offline"
+      const ssid = wifi.ssid || "wifi"
+      const strength = wifi.strength
+      let icon = "󰤯"
+      if (strength > 80) icon = "󰤨"
+      else if (strength > 60) icon = "󰤥"
+      else if (strength > 40) icon = "󰤢"
+      else if (strength > 20) icon = "󰤟"
+      return `${icon} ${ssid}`
+    }
+    if (type === AstalNetwork.Primary.WIRED) return "󰈀 eth"
+    return "󰤮 offline"
+  })
+
+  const cls = createBinding(net, "primary")((type: AstalNetwork.Primary) => {
+    if (type === AstalNetwork.Primary.WIFI) return "network wifi"
+    if (type === AstalNetwork.Primary.WIRED) return "network wired"
+    return "network disconnected"
+  })
+
+  return <label class={cls} label={text} />
+}