feat(menu): group the rofi picker into Tools / System submenus

The root picker had grown to 16 flat entries. Collapse it to six —
Apps · Theme · Tools › · System › · Power · Keybindings — with Tools
(Calculator, Clipboard, Emoji, Files, Web, Capture, Ask) and System
(Network, Bluetooth, DND, plus the self-gated Snapshots / Power-profile)
as submenus the dispatcher routes via `nomarchy-menu tools|system`. Each
submenu ends in a ← Back entry that re-opens the root. The direct
SUPER+CTRL+<mnemonic> binds still reach the leaves straight (bypassing
the menu), and the gated entries still hide when unavailable.

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

docs/ROADMAP.md

@@ -37,15 +37,16 @@ how to override it. Items marked ✓ are shipped.
     launcher, no second theming pipeline; the dispatcher owns the menu
     structure, so the renderer stays swappable (we moved fuzzel → rofi 2.0
     once mainline gained native Wayland, for its richer theming)
-  - **Organize the picker into category submenus:** the root picker has grown
-    into a long flat list (Apps · Theme · Clipboard · Calculator · Files ·
-    Emoji · Web · Network · Bluetooth · Capture · Keybindings · Ask · DND ·
-    Snapshots · Power profile · Power · …). Group it into category submenus
-    (e.g. **System**, **Tools**, **Look & Feel**, **Power**) so the top level
-    stays short and scannable, the dispatcher routing `nomarchy-menu <category>`
-    → its leaf modules. Keep the direct `SUPER+CTRL+<mnemonic>` binds as fast
-    paths straight to the leaves (they bypass the menu), and self-gated
-    entries (power-profile, snapshots) still hide when unavailable.
+  - ✓ **Organize the picker into category submenus:** the root picker had grown
+    into a long flat list of 16 entries. It's now six: **Apps · Theme · Tools ›
+    · System › · Power · Keybindings**. `Tools` (Calculator, Clipboard, Emoji,
+    Files, Web, Capture, Ask) and `System` (Network, Bluetooth, DND, and the
+    self-gated Snapshots / Power-profile) are submenus the dispatcher routes via
+    `nomarchy-menu tools|system`, each ending in a `← Back` entry that re-opens
+    the root. The direct `SUPER+CTRL+<mnemonic>` binds still hit the leaves
+    straight (bypassing the menu), and the self-gated entries still hide when
+    unavailable. Remaining (optional): a **Look & Feel** category once there are
+    more appearance toggles to group with Theme (night-light, wallpaper).
 - ✓ **Menu modules from rofi plugins:** the old `calc` flow committed the
   expression blind (result only in the *next* menu's `-mesg`) and `qalc -t`
   misparsed common phrasings (`15% of 200` → `rem(15, 1 B)`, the natural-