feat(capture): screen recording — menu start, bar-click stop (item 12)

nomarchy-record owns the lifecycle: start prefers wl-screenrec (VAAPI
hardware encode) and falls back to wf-recorder if it dies at startup
(the no-VAAPI case), stop SIGINTs so the file finalizes cleanly, and
status feeds a self-gating Waybar ⏺ REC (alert red) whose click is
the one stop surface — signal 8 pokes make it appear/vanish
instantly. Capture gains Record region/screen (+ audio variants) and
self-swaps to '■ Stop recording' while one runs. Parity: both summer
whole-swap bars carry the same module. Recordings land in
~/Videos/Recordings with the screenshot timestamp naming (deviation
from 'next to Screenshots': an .mp4 in Pictures felt wrong).

V1: rendered bar config + CSS asserted, summer jsonc parse, recorder
dry-run state machine correct (idle/active/usage exits), both
recorders in home-path. Real capture needs a session → V3 queued
(incl. the VAAPI-vs-fallback check on the AMD box).

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

modules/home/default.nix

@@ -25,6 +25,7 @@
     ./fastfetch.nix # system info with the themed Nomarchy logo
     ./viewers.nix   # zathura (Stylix-themed) + imv — PDF/image viewing
     ./mime.nix      # default applications (mimeapps.list), degrades with the suite
+    ./recording.nix # nomarchy-record: screen recording behind Capture + the bar ⏺
   ];
 
   # Clipboard history (wl-paste watcher); browsed via the SUPER+CTRL+V