feat(menu): network/bluetooth/capture/ask modules + keybindings cheatsheet

Build out the rofi menu system roadmap item:

- New nomarchy-menu modules: network (nmtui), bluetooth (blueman-manager),
  capture (grim/slurp submenu → clipboard/file), ask (free-text → claude
  CLI in a terminal), and keybinds (the SUPER+? cheatsheet).
- modules/home/keybinds.nix is now the single source of truth for both the
  Hyprland bind strings and the cheatsheet, so the two can't drift —
  hyprland.nix maps it into `bind`, rofi.nix renders the padded two-column
  sheet (generated/mouse binds live in its `extra` rows).
- New binds: SUPER+Space (quick launch), SUPER+M (main menu), SUPER+?
  (cheatsheet). SUPER+D stays rofi -show drun.
- Ask Claude pulls claude-code fresh from npm via `npx
  @anthropic-ai/claude-code@latest` (the nixpkgs package lags model
  releases); nodejs is bundled for npx.

nix flake check passes.

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

README.md

@@ -274,14 +274,20 @@ close · `SUPER+1..9` workspaces · `Print` region screenshot.
     `theme` (SUPER+T) · `clipboard` (cliphist, SUPER+CTRL+V) · `calc`
     (qalc, copy/chain) · `files` (fd → xdg-open) · `web` (DuckDuckGo).
     SUPER+D is `rofi -show drun`.
-  - next modules: Network ▸ nmtui · Bluetooth ▸ blueman · Capture ▸
-    screenshot · **keybindings cheatsheet** (parse the bind list → rofi,
-    so SUPER-? shows every shortcut) · **ask Claude**: free-text →
-    `$TERMINAL -e claude "<question>"` — the claude CLI auths via OAuth
-    against a Pro/Max subscription (no API key); REPL stays open for
-    follow-ups (claude-code in nixpkgs is unfree — allowUnfree is on)
-  - planned binds: `SUPER+Space` → `rofi -dmenu`/quick-launch and
-    `SUPER+M` → `nomarchy-menu` (main menu); `SUPER+D` stays `-show drun`
+  - ✓ shipped modules: `network` (nmtui in `$TERMINAL`) · `bluetooth`
+    (blueman-manager) · `capture` (grim/slurp submenu: region/full →
+    clipboard/file, saved to `~/Pictures/Screenshots`) · `keybinds` (the
+    cheatsheet, see below) · `ask` (free-text → claude CLI in a terminal;
+    auths via OAuth, no API key; pulled fresh via `npx
+    @anthropic-ai/claude-code@latest` rather than the nixpkgs package, which
+    lags model releases — `nodejs` is bundled for npx; REPL stays open)
+  - ✓ keybindings cheatsheet: `modules/home/keybinds.nix` is the **single
+    source** for both the Hyprland binds and the SUPER+? rofi list, so they
+    can't drift; `nomarchy-menu keybinds` renders the padded two-column
+    sheet (generated/mouse binds carried in its `extra` rows)
+  - ✓ shipped binds: `SUPER+Space` → `rofi -show drun` (quick launch) ·
+    `SUPER+M` → `nomarchy-menu` (main menu) · `SUPER+?` → the cheatsheet;
+    `SUPER+D` stays `-show drun`
   - launcher icons: ✓ `show-icons` on, drawing from the theme's icon set
     (Papirus, via the icon-themes work below)
   - decision record: resolves the old Walker/Lua question — no GTK4