desktop: add sway/swayfx profile (dormant) with waybar, kanshi, cliphist

New profile_desktop_sway role gated by desktop_sessions_enabled, with
SwayFX effects, Waybar bar (1:1 with Polybar layout + pulseaudio),
swayidle + swaylock-effects for locking, swayosd for OSD, cliphist for
clipboard history and kanshi for multi-monitor profiles. Emptty gains
WAYLAND_SESSIONS_PATH + wayland-sessions dir. start-sway wrapper handles
session env (dbus-run-session, gpg-agent, turnstile env). Profile stays
dormant until a host opts in via desktop_sessions_enabled.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

dotfiles/desktop/.config/waybar/config.jsonc

@@ -0,0 +1,101 @@
+{
+  "layer": "top",
+  "position": "top",
+  "height": 26,
+  "spacing": 4,
+
+  "modules-left":   ["sway/workspaces"],
+  "modules-center": ["clock"],
+  "modules-right":  ["cpu", "memory", "disk", "temperature", "backlight", "network", "pulseaudio", "battery", "tray"],
+
+  "sway/workspaces": {
+    "disable-scroll": true,
+    "all-outputs": false,
+    "format": "{icon}",
+    "format-icons": {
+      "1":  "I",
+      "2":  "II",
+      "3":  "III",
+      "4":  "IV",
+      "5":  "V",
+      "6":  "VI",
+      "7":  "VII",
+      "8":  "VIII",
+      "9":  "IX",
+      "10": "X"
+    },
+    "persistent-workspaces": {
+      "*": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+    }
+  },
+
+  "clock": {
+    "interval": 60,
+    "format": " {:%Y-%m-%d %H:%M}",
+    "tooltip-format": "<tt>{calendar}</tt>"
+  },
+
+  "cpu": {
+    "interval": 5,
+    "format": " {usage}%"
+  },
+
+  "memory": {
+    "interval": 10,
+    "format": " {used:0.1f}G / {total:0.1f}G"
+  },
+
+  "disk": {
+    "interval": 60,
+    "path": "/",
+    "format": " {used} / {total}"
+  },
+
+  "temperature": {
+    "interval": 10,
+    "critical-threshold": 80,
+    "format":          " {temperatureC}°C",
+    "format-critical": " {temperatureC}°C"
+  },
+
+  "backlight": {
+    "format": " {percent}%",
+    "on-scroll-up":   "brightnessctl set +5%",
+    "on-scroll-down": "brightnessctl set 5%-"
+  },
+
+  "network": {
+    "interval": 5,
+    "format-wifi":         " {essid} {signalStrength}%",
+    "format-ethernet":     " {ifname}",
+    "format-disconnected": " offline",
+    "tooltip-format":      "{ifname} {ipaddr}"
+  },
+
+  "pulseaudio": {
+    "format":           "{icon} {volume}%",
+    "format-muted":     " muted",
+    "format-bluetooth": "{icon} {volume}% ",
+    "format-icons":     { "default": ["", "", ""] },
+    "on-click":         "swayosd-client --output-volume mute-toggle",
+    "on-click-right":   "pavucontrol"
+  },
+
+  "battery": {
+    "bat": "BAT0",
+    "interval": 30,
+    "states": {
+      "warning":  30,
+      "critical": 15
+    },
+    "format":           "{icon} {capacity}%",
+    "format-charging":  " {capacity}%",
+    "format-full":      " full",
+    "format-icons":     ["", "", "", "", ""]
+  },
+
+  "tray": {
+    "icon-size": 16,
+    "spacing": 6
+  }
+}