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>

themes/summer-day/waybar.css

@@ -43,6 +43,7 @@ window#waybar {
 }
 
 #custom-launcher,
+#custom-recording,
 #clock,
 #clock-date,
 #workspaces,
@@ -114,3 +115,8 @@ window#waybar {
   padding-left: 20px;
   padding-right: 23px;
 }
+
+/* Recording in progress: alert red; the module is also the stop button. */
+#custom-recording.recording {
+  color: @red;
+}