feat(ags-v3): desktop adaptation — ultrawide scaling, brain power panel, system stats

- Scaling 16px base pour ultrawide 3440x1440
- Bar: CPU/RAM/GPU visible, media single player (skip playerctld), network tooltip LAN/WAN IPv4
- Volume: class module pour sizing cohérent
- Battery: désactivé (PC fixe)
- Clock: tooltip calendrier + uptime
- BrainPower: panel enrichi (focus, session, intentions, todos, repos git, derniers commits)
- App: BrainPower sur moniteur principal uniquement
- Heartbeat: Layer.TOP pour compatibilité COSMIC

ags-v3/widget/modules/SystemStats.tsx

@@ -1,5 +1,6 @@
 import GLib from "gi://GLib"
 import { createPoll } from "ags/time"
+import { exec } from "ags/process"
 
 function readProc(path: string): string | null {
   try {
@@ -16,9 +17,9 @@ function getCpuUsage(): string {
   const content = readProc("/proc/stat")
   if (!content) return "?"
 
-  const line = content.split("\n")[0]  // "cpu  user nice system idle ..."
+  const line = content.split("\n")[0]
   const parts = line.split(/\s+/).slice(1).map(Number)
-  const idle = parts[3] + parts[4]  // idle + iowait
+  const idle = parts[3] + parts[4]
   const total = parts.reduce((a, b) => a + b, 0)
 
   const dIdle = idle - prevIdle
@@ -30,31 +31,59 @@ function getCpuUsage(): string {
   return `${Math.round(((dTotal - dIdle) / dTotal) * 100)}`
 }
 
-function getRamUsage(): string {
+function getRamUsage(): { pct: string; used: string; total: string } {
   const content = readProc("/proc/meminfo")
-  if (!content) return "?"
+  if (!content) return { pct: "?", used: "?", total: "?" }
 
   const lines = content.split("\n")
-  let total = 0, available = 0
+  let totalKb = 0, availableKb = 0
 
   for (const line of lines) {
-    if (line.startsWith("MemTotal:")) total = parseInt(line.split(/\s+/)[1])
-    if (line.startsWith("MemAvailable:")) available = parseInt(line.split(/\s+/)[1])
-    if (total && available) break
+    if (line.startsWith("MemTotal:")) totalKb = parseInt(line.split(/\s+/)[1])
+    if (line.startsWith("MemAvailable:")) availableKb = parseInt(line.split(/\s+/)[1])
+    if (totalKb && availableKb) break
   }
 
-  if (!total) return "?"
-  return `${Math.round(((total - available) / total) * 100)}`
+  if (!totalKb) return { pct: "?", used: "?", total: "?" }
+  const usedGb = ((totalKb - availableKb) / 1048576).toFixed(1)
+  const totalGb = (totalKb / 1048576).toFixed(0)
+  const pct = `${Math.round(((totalKb - availableKb) / totalKb) * 100)}`
+  return { pct, used: usedGb, total: totalGb }
+}
+
+function getGpuInfo(): string {
+  try {
+    const out = exec("bash -c \"nvidia-smi --query-gpu=utilization.gpu,temperature.gpu --format=csv,noheader,nounits 2>/dev/null\"")
+    const [usage, temp] = out.trim().split(", ")
+    return `GPU ${usage}% · ${temp}°C`
+  } catch {
+    return ""
+  }
 }
 
 export default function SystemStats() {
   const cpu = createPoll("0", 3000, () => getCpuUsage())
-  const ram = createPoll("0", 5000, () => getRamUsage())
+  const ram = createPoll("", 5000, () => {
+    const r = getRamUsage()
+    return JSON.stringify(r)
+  })
+
+  const ramLabel = ram((v: string) => {
+    try {
+      const r = JSON.parse(v)
+      return `RAM ${r.used}/${r.total}G`
+    } catch { return "RAM ?" }
+  })
+
+  const gpu = createPoll("", 5000, () => getGpuInfo())
 
   return (
     <box>
-      <label class="cpu module" label={cpu((v: string) => ` ${v}%`)} />
-      <label class="ram module" label={ram((v: string) => `󰍛 ${v}%`)} />
+      <label class="cpu module" label={cpu((v: string) => `CPU ${v}%`)} />
+      <label class="separator" label="│" />
+      <label class="ram module" label={ramLabel} />
+      <label class="separator" label="│" />
+      <label class="gpu module" label={gpu((v: string) => v || "GPU ?")} />
     </box>
   )
 }