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/styles/_bar.scss

@@ -11,7 +11,7 @@ window.Bar {
     border: 3px solid rgba(255, 77, 166, 0.60);  // $magenta @ 0.60
     margin: 6px 8px;
     padding: 0 8px;
-    min-height: 38px;
+    min-height: 48px;
   }
 
   .modules-left,
@@ -27,20 +27,20 @@ window.Bar {
 
   .prompt-name {
     color: $magenta;
-    font-size: 14px;
-    padding: 0 0 0 10px;
+    font-size: 17px;
+    padding: 0 0 0 14px;
   }
 
   .prompt-cursor {
     color: $lilac;
-    font-size: 14px;
+    font-size: 17px;
     font-weight: 900;
   }
 
   .separator {
     color: rgba(240, 234, 248, 0.12);  // $text @ 0.12
-    font-size: 11px;
-    padding: 0 4px;
+    font-size: 14px;
+    padding: 0 6px;
     font-weight: normal;
   }
 
@@ -48,14 +48,14 @@ window.Bar {
   .clock {
     color: $magenta;
     font-weight: 900;
-    font-size: 14px;
+    font-size: 18px;
     letter-spacing: 0.04em;
     padding: 0 10px;
   }
 
   .date {
     color: $lavande;
-    font-size: 12px;
+    font-size: 15px;
     font-weight: normal;
     padding: 0 10px 0 2px;
   }
@@ -69,7 +69,9 @@ window.Bar {
     font-weight: normal;
   }
 
-  .cpu, .ram, .temp {
+  .gpu { color: $mitsuri; }
+
+  .cpu, .ram, .gpu, .temp {
     &.warning { color: $champagne; }
     &.critical { color: $danger; }
   }
@@ -77,8 +79,8 @@ window.Bar {
   // ── network ──
   .network {
     color: $lavande;
-    font-size: 12px;
-    padding: 0 8px;
+    font-size: 15px;
+    padding: 0 10px;
     &.disconnected { color: $danger; }
   }
 
@@ -121,7 +123,7 @@ window.Bar {
 
   .media-text {
     color: $lilac;
-    font-size: 12px;
+    font-size: 15px;
     font-weight: normal;
     padding: 0 6px;
   }
@@ -135,7 +137,7 @@ window.Bar {
     min-width: 0;
     min-height: 0;
 
-    label { color: $lilac; font-size: 13px; }
+    label { color: $lilac; font-size: 16px; }
     &:hover label { color: $magenta; }
   }