fix(home): power menu on SUPER+X, not SUPER+Escape

Super+Escape didn't fire on real hardware (Latitude 5410) while its
neighbour binds did — the chord gets swallowed before reaching
Hyprland's dispatcher on some setups. SUPER+X is unambiguous.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

README.md

@@ -236,7 +236,7 @@ home-update                            # rebuild just the desktop layer
 ```
 
 Keybinds: `SUPER+Return` terminal · `SUPER+D` launcher · `SUPER+T` theme
-picker · `SUPER+SHIFT+T` next wallpaper · `SUPER+Escape` power menu ·
+picker · `SUPER+SHIFT+T` next wallpaper · `SUPER+X` power menu ·
 `SUPER+N` notifications · `SUPER+CTRL+V` clipboard history · `SUPER+Q`
 close · `SUPER+1..9` workspaces · `Print` region screenshot.
 
@@ -257,7 +257,7 @@ close · `SUPER+1..9` workspaces · `Print` region screenshot.
   - ✓ shipped: `modules/home/fuzzel.nix` (palette/fonts/border from the
     theme JSON, `themes/<slug>/fuzzel.ini` whole-swap) and the
     `nomarchy-menu` dispatcher: root picker (no args) · `power`
-    (lock/logout/suspend/hibernate/reboot/shutdown, SUPER+Escape) ·
+    (lock/logout/suspend/hibernate/reboot/shutdown, SUPER+X) ·
     `theme` (SUPER+T) · `clipboard` (cliphist, SUPER+CTRL+V) · `calc`
     (qalc, copy/chain) · `files` (fd → xdg-open) · `web` (DuckDuckGo)
   - next modules: Network ▸ nmtui · Bluetooth ▸ blueman · Capture ▸