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/Bar.tsx

@@ -0,0 +1,74 @@
+import app from "ags/gtk3/app"
+import { Astal, Gtk, Gdk } from "ags/gtk3"
+import Clock from "./modules/Clock"
+import Battery from "./modules/Battery"
+import Volume from "./modules/Volume"
+import Network from "./modules/Network"
+import SystemStats from "./modules/SystemStats"
+import Media from "./modules/Media"
+import SysTray from "./modules/SysTray"
+import Prompt from "./modules/Prompt"
+
+export default function Bar(gdkmonitor: Gdk.Monitor) {
+  const { TOP, LEFT, RIGHT } = Astal.WindowAnchor
+
+  let hideTimeout: number | null = null
+
+  function scheduleHide(win: Astal.Window) {
+    if (hideTimeout) clearTimeout(hideTimeout)
+    hideTimeout = setTimeout(() => {
+      win.visible = false
+      hideTimeout = null
+    }, 800)
+  }
+
+  function cancelHide() {
+    if (hideTimeout) {
+      clearTimeout(hideTimeout)
+      hideTimeout = null
+    }
+  }
+
+  return (
+    <window
+      class="Bar"
+      name="bar"
+      visible={false}
+      gdkmonitor={gdkmonitor}
+      exclusivity={Astal.Exclusivity.EXCLUSIVE}
+      anchor={TOP | LEFT | RIGHT}
+      application={app}
+      layer={Astal.Layer.TOP}
+    >
+      <eventbox
+        onHover={() => cancelHide()}
+        onHoverLost={(self) => {
+          const win = self.get_toplevel() as Astal.Window
+          scheduleHide(win)
+        }}
+      >
+        <centerbox>
+          <box $type="start" class="modules-left" halign={Gtk.Align.START}>
+            <Prompt />
+            <label class="separator" label="│" />
+            <SystemStats />
+            <label class="separator" label="│" />
+            <Media />
+          </box>
+          <box $type="center" class="modules-center">
+            <Clock />
+          </box>
+          <box $type="end" class="modules-right" halign={Gtk.Align.END}>
+            <SysTray />
+            <label class="separator" label="│" />
+            <Network />
+            <label class="separator" label="│" />
+            <Volume />
+            <label class="separator" label="│" />
+            <Battery />
+          </box>
+        </centerbox>
+      </eventbox>
+    </window>
+  )
+}