Workstation optimization: Chrome cleanup, package purge, PCIe audit, service tuning

- Chrome/Chromium cleanup (ADR 0006): removed 10GB chromium profile, broken PWA
  shortcuts, dead BROWSER_CDP_URL from .bashrc, restored Wayland chrome-flags.conf
- Package cleanup (ADR 0007): Tier 1-4 executed, 40 packages removed (KDE Plasma,
  ruby, love, xorg-server, kscreen/kscreenlocker), 45 cascade orphans purged
- Waybar USB module: auto-mount via udisks2, yazi integration, hover details
- Service tuning: disabled bluetooth.service, NetworkManager-wait-online.service
- hypridle fix: upgraded sdbus-cpp 2.3.0->2.3.1-1 (SEGV crash loop resolved)
- PCIe audit: GPU in wrong slot (PCIEX4 vs PCIEX16), 8x bandwidth loss documented
- D-Bus cleanup: removed stale org.kde.kwalletd6.service stub
- Ansible: all changes reflected in vars/main.yml and task files

ansible/roles/hyprland/templates/waybar_style.css.j2

@@ -21,10 +21,27 @@ window#waybar {
     border-bottom: 3px solid #ffffff;
 }
 
-#clock, #cpu, #memory, #network, #tray, #pulseaudio, #custom-gpu {
+#clock, #cpu, #memory, #network, #tray, #pulseaudio, #custom-gpu, #custom-usb {
     padding: 0 10px;
 }
 
 #pulseaudio:hover {
     background: #555;
 }
+
+#custom-usb:hover {
+    background: #555;
+}
+
+#custom-usb.usb-none {
+    color: transparent;
+    padding: 0;
+}
+
+#custom-usb.usb-mounted {
+    color: #a3be8c;
+}
+
+#custom-usb.usb-unmounted {
+    color: #ebcb8b;
+}