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-v1/widgets/OSD.js

@@ -0,0 +1,95 @@
+// ── violet-chaton v2 — OSD widget ───────────────────────────────────────────
+// Overlay volume / brightness avec gradient Mitsuri
+
+const audio = Service.import("audio");
+
+// ── OSD reveal timer ────────────────────────────────────────────────────────
+
+let osdTimeout = null;
+
+const showOSD = (window) => {
+    window.visible = true;
+    if (osdTimeout) clearTimeout(osdTimeout);
+    osdTimeout = setTimeout(() => {
+        window.visible = false;
+    }, 1500);
+};
+
+// ── Volume OSD ──────────────────────────────────────────────────────────────
+
+const VolumeOSD = () => {
+    const icon = Widget.Label({ className: "icon" });
+    const progress = Widget.ProgressBar();
+    const label = Widget.Label({ className: "label" });
+
+    const box = Widget.Box({
+        className: "osd",
+        children: [icon, progress, label],
+        connections: [[audio, (self) => {
+            const vol = audio.speaker?.volume || 0;
+            const muted = audio.speaker?.isMuted;
+            icon.label = muted ? "󰝟" : vol > 0.66 ? "󰕾" : vol > 0.33 ? "󰖀" : "󰕿";
+            progress.value = vol;
+            label.label = `${Math.round(vol * 100)}%`;
+        }, "speaker-changed"]],
+    });
+
+    return box;
+};
+
+// ── Brightness OSD ──────────────────────────────────────────────────────────
+
+const BrightnessOSD = () => {
+    const icon = Widget.Label({ className: "icon", label: "󰃞" });
+    const progress = Widget.ProgressBar();
+    const label = Widget.Label({ className: "label" });
+
+    const getBrightness = () => {
+        try {
+            const max = Number(Utils.exec("brightnessctl max"));
+            const cur = Number(Utils.exec("brightnessctl get"));
+            return max > 0 ? cur / max : 0;
+        } catch {
+            return 0;
+        }
+    };
+
+    const box = Widget.Box({
+        className: "osd",
+        children: [icon, progress, label],
+        connections: [[500, (self) => {
+            const val = getBrightness();
+            progress.value = val;
+            label.label = `${Math.round(val * 100)}%`;
+        }]],
+    });
+
+    return box;
+};
+
+// ── OSD windows ─────────────────────────────────────────────────────────────
+
+export const OSD = (monitor) => {
+    const volumeWin = Widget.Window({
+        name: `osd-volume-${monitor}`,
+        monitor,
+        anchor: ["bottom"],
+        layer: "overlay",
+        visible: false,
+        child: VolumeOSD(),
+    });
+
+    const brightnessWin = Widget.Window({
+        name: `osd-brightness-${monitor}`,
+        monitor,
+        anchor: ["bottom"],
+        layer: "overlay",
+        visible: false,
+        child: BrightnessOSD(),
+    });
+
+    // Auto-show on volume change
+    Utils.merge([audio.speaker?.bind("volume")], () => showOSD(volumeWin));
+
+    return [volumeWin, brightnessWin];
+};