feat(keybinds): direct SUPER+CTRL binds for the menu functions

Each nomarchy-menu module is now reachable directly, not just through the
SUPER+M picker: SUPER+CTRL+ V clipboard · C calc · W web · F files ·
N network · B bluetooth · S capture · A ask. Added to keybinds.nix (the
single source), so they render in the SUPER+? cheatsheet too. No key
collisions; nix flake check passes.

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

README.md

@@ -372,10 +372,10 @@ close · `SUPER+1..9` workspaces · `Print` region screenshot.
 - ✓ **xfce deprecation warnings:** moved `xfce.exo` → `pkgs.xfce4-exo` and
   the three Thunar plugins to their new top-level names in
   `modules/nixos/file-manager.nix`; the eval warnings are gone.
-- **Rofi function keybindings:** add direct Hyprland binds for the
-  `nomarchy-menu` sub-functions (calc, web search, file search, clipboard,
-  …) instead of only reaching them through the menu — see the planned binds
-  in the Menu-system roadmap item and `modules/home/hyprland.nix`.
+- ✓ **Rofi function keybindings:** direct `SUPER+CTRL+<mnemonic>` binds jump
+  straight to each `nomarchy-menu` module — V clipboard · C calc · W web ·
+  F files · N network · B bluetooth · S capture · A ask — added to
+  `modules/home/keybinds.nix`, so they also show in the SUPER+? cheatsheet.
 - ✓ **Enable nix-ld by default:** `programs.nix-ld.enable` is on distro-wide
   (`modules/nixos/default.nix`), so prebuilt/foreign dynamically-linked
   binaries run out of the box.