fix(waybar): show the power-profile indicator in the summer themes

custom/powerprofile only appeared in the generated bar -- its exec was a
writeShellScript store path, which can't go in the summer themes' static
whole-swap waybar.jsonc, so summer-day/night were missing it (the DND bell
already had parity). Promote powerProfileStatus/Cycle to named
writeShellScriptBins on PATH (waybar.nix home.packages) and reference them
by bare name, then add custom/powerprofile to both summer waybar.jsonc +
their waybar.css. Same pattern as the swaync bell.

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

docs/ROADMAP.md

@@ -204,15 +204,12 @@ how to override it. Items marked ✓ are shipped.
     idle behaviour.
   - Remaining: a boot-only→event-driven charge-limit re-apply (udev) if a
     firmware resets the threshold on unplug.
-  - Remaining: the `custom/powerprofile` Waybar indicator only lands in the
-    generated config — the summer-day/night whole-swap `waybar.jsonc` don't
-    show it (the module's exec points at Nix-built script store paths, which
-    can't go in static JSON). Fix by promoting `powerProfileStatus`/`Cycle`
-    from `writeShellScript` to named `writeShellScriptBin`s on PATH, then
-    reference them by bare name from both the generated config and the
-    whole-swap themes (the same parity the DND bell now has). General
-    pattern: any new generated-config module needs adding to the whole-swap
-    themes too.
+  - ✓ **Waybar parity:** the `custom/powerprofile` indicator now shows in the
+    summer-day/night whole-swap themes too. `powerProfileStatus`/`Cycle` are
+    named `writeShellScriptBin`s on PATH (`waybar.nix` home.packages), so the
+    generated config and the static `waybar.jsonc` both exec them by bare
+    name (the same parity the DND bell has). General pattern: any new
+    generated-config module needs adding to the whole-swap themes too.
 - **Full hardware enablement (beyond nixos-hardware):** nixos-hardware
   profiles cover *basic* per-model functionality (quirks, drivers), but the
   *advanced* features of a machine — keyed more on the CPU/GPU generation