feat(menu): hyprpicker color picker — Tools › row + SUPER+CTRL+P (item 13 done)

The last niceties slice: pick a pixel's color into the clipboard.
hyprpicker joins grim/slurp in systemPackages; a new nomarchy-menu
`colorpicker` mode captures its output, wl-copies it, and toasts the
hex (Esc = silent cancel). Tools › row self-gates on hyprpicker being
present; SUPER+CTRL+P added in keybinds.nix, so the Hyprland bind and
the SUPER+? cheatsheet row come from the one source. Item 13 complete
and deleted from BACKLOG.

Verified: V0 (flake check); V1 — template-home and template-system
build; rendered nomarchy-menu passes bash -n and contains the mode +
gated row; cheatsheet has the SUPER+CTRL+P row; hyprland.conf has the
bind; the system toplevel ships sw/bin/hyprpicker. Remains: V3 — real
loupe → click → wl-paste round-trip in a session (HARDWARE-QUEUE).

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

agent/HARDWARE-QUEUE.md

@@ -140,6 +140,10 @@ QA machine), the **T14s** (webcam case).
       now reflects the real state (the `= true` comparison fix).
       — 2026-07-04 Bernardo: PASS — theme changes committed and the
       toggle self-committed.
+- [ ] **Color picker (item 13, final slice)** — SUPER+CTRL+P (or Tools ›
+      Color picker): hyprpicker's zoom loupe appears; click a pixel →
+      toast shows the hex and `wl-paste` yields it; Esc cancels with no
+      toast. Row present in the SUPER+? cheatsheet.
 - [ ] **Low-battery toasts (item 13 slice)** — on battery, drain past
       25%: one "Battery low" toast; past 10%: a critical "Battery
       critical" toast that stays up until dismissed (swaync); plug in,