feat(waybar): combined power menu on the battery + profile icons

Item 36(b). Adds `nomarchy-menu powermgmt` — one flat rofi menu of power
Profile rows (→ powerprofilesctl set) + Charge limit rows (→ the same
theme-sync writer batterylimit uses), each half self-gating on its
hardware. No backend duplication; Custom charge stays in the dedicated
batterylimit picker.

Opened two ways (Bernardo's call): the Waybar battery icon AND the
power-profile icon — the profile icon's click flips from cycle → menu.
Wired in waybar.nix and all four whole-swaps (parity). Named `powermgmt`
to avoid the whole-swaps' existing `custom/powermenu` shutdown button
(→ nomarchy-menu power), which is left untouched. The granular System ▸
Power profile / Battery limit rows stay ("keep both").
nomarchy-powerprofile-cycle kept as a standalone bin, now unbound by
default.

Verified: V0 green; V1 HM built (bash -n) — powermgmt case ships, the
generated waybar-config.json wires both icons (2 hits), all four jsoncs
re-wired and still parse, shutdown buttons intact. Click→menu→apply is
V3 (queued).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

modules/home/rofi.nix

@@ -256,6 +256,56 @@ let
         [ "$choice" = "$BACK" ] && exec "$0" system
         [ -n "$choice" ] && powerprofilesctl set "$choice" ;;
 
+      powermgmt)
+        # Combined power menu (item 36b) — power PROFILE + battery CHARGE cap
+        # in one flat list, opened from BOTH the Waybar battery and
+        # power-profile icons (the two granular System ▸ Power profile /
+        # Battery limit rows stay for direct access). No new backend: profile
+        # rows drive powerprofilesctl like the power-profile picker, charge
+        # rows drive the same theme-sync writer as batterylimit. Each half
+        # self-gates on its hardware, so a desktop with neither just toasts.
+        bats=(/sys/class/power_supply/BAT*)
+        haveppd=false;    command -v powerprofilesctl >/dev/null 2>&1 && haveppd=true
+        havecharge=false; [ -e "''${bats[0]}/charge_control_end_threshold" ] && havecharge=true
+        if ! $haveppd && ! $havecharge; then
+          notify-send "Power" "No power-profile or charge-limit control on this machine."
+          exit 0
+        fi
+        curp=""; $haveppd && curp=$(powerprofilesctl get 2>/dev/null)
+        curc=$(nomarchy-theme-sync get settings.power.batteryChargeLimit 2>/dev/null)
+        choice=$( {
+          if $haveppd; then
+            powerprofilesctl list 2>/dev/null | sed -nE 's/^[* ] ([a-z-]+):$/\1/p' \
+              | while IFS= read -r p; do
+                  case "$p" in
+                    performance) row "Profile: $p" battery-profile-performance ;;
+                    balanced)    row "Profile: $p" battery-profile-balanced ;;
+                    power-saver) row "Profile: $p" battery-profile-powersave ;;
+                    *)           row "Profile: $p" preferences-system-power ;;
+                  esac
+                done
+          fi
+          if $havecharge; then
+            row "Charge limit: 80% (recommended)" battery-080
+            row "Charge limit: 90%"               battery-090
+            row "Charge limit: 60%"               battery-060
+            row "Charge limit: Off (100%)"        battery-100
+          fi
+          back
+        } | rofi -dmenu -show-icons -p "Power — profile: ''${curp:-n/a}, limit: ''${curc:-default}") || exit 0
+        set_limit() {
+          nomarchy-theme-sync --quiet set settings.power.batteryChargeLimit "$1" --no-switch
+          notify-send "Battery limit" "$2 — applies on the next rebuild."
+        }
+        case "$choice" in
+          "$BACK")              exec "$0" ;;
+          "Profile: "*)         powerprofilesctl set "''${choice#Profile: }" ;;
+          "Charge limit: 80%"*) set_limit 80 "Set to 80%" ;;
+          "Charge limit: 90%"*) set_limit 90 "Set to 90%" ;;
+          "Charge limit: 60%"*) set_limit 60 "Set to 60%" ;;
+          "Charge limit: Off"*) set_limit null "Off — charges to 100%" ;;
+        esac ;;
+
       theme)
         # Visual picker: a grid of real desktop previews (rows + Name→slug
         # map generated from the presets at build time). Pick a card → apply
@@ -790,7 +840,7 @@ ${themeRows}
         esac ;;
 
       *)
-        echo "usage: nomarchy-menu [lookfeel|tools|system|power|power-profile|batterylimit|theme|clipboard|calc|files|emoji|web|network|bluetooth|audio|display|display-profile|printers|capture|colorpicker|keybinds|ask|dnd|nightlight|autotimezone|autocommit|vpn|snapshot]" >&2
+        echo "usage: nomarchy-menu [lookfeel|tools|system|power|power-profile|powermgmt|batterylimit|theme|clipboard|calc|files|emoji|web|network|bluetooth|audio|display|display-profile|printers|capture|colorpicker|keybinds|ask|dnd|nightlight|autotimezone|autocommit|vpn|snapshot]" >&2
         exit 64 ;;
     esac
   '';

modules/home/waybar.nix

@@ -199,13 +199,19 @@ let
       format = "<span size='${toString (t.fonts.size + 2)}pt'>{icon}</span> {capacity}%";
       format-charging = "<span size='${toString (t.fonts.size + 2)}pt'>󰂄</span> {capacity}%";
       format-icons = [ "󰁺" "󰁼" "󰁾" "󰂀" "󰁹" ];
+      # Click either the battery or the power-profile icon → the combined
+      # power menu (profile + charge cap). The granular System rows stay.
+      on-click = "nomarchy-menu powermgmt";
     };
 
     "custom/powerprofile" = {
       exec = "nomarchy-powerprofile-status";
       return-type = "json";
       interval = 5;
-      on-click = "nomarchy-powerprofile-cycle";
+      # Opens the same combined power menu as the battery icon (item 36b).
+      # nomarchy-powerprofile-cycle stays a standalone bin for downstream
+      # rebinding — it's just no longer the default click.
+      on-click = "nomarchy-menu powermgmt";
     };
 
     # VPN shield — self-hides unless a NM VPN/WireGuard tunnel or Tailscale is