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/waybar.nix

@@ -121,7 +121,7 @@ let
 
     modules-left = [ "hyprland/workspaces" "hyprland/window" ];
     modules-center = [ "clock" ];
-    modules-right = [ "tray" "custom/vpn" "pulseaudio" "cpu" "memory" "custom/powerprofile" "custom/nightlight" ]
+    modules-right = [ "custom/recording" "tray" "custom/vpn" "pulseaudio" "cpu" "memory" "custom/powerprofile" "custom/nightlight" ]
       ++ lib.optional showLanguage "hyprland/language"
       ++ [ "battery" "custom/updates" "custom/notification" ];
 
@@ -184,6 +184,19 @@ let
       on-click = "nomarchy-vpn";
     };
 
+    # Screen recording indicator. Self-gates: visible only while
+    # nomarchy-record runs (status prints nothing otherwise), and the
+    # click IS the stop surface — the menu only starts recordings.
+    # signal 8: the recorder pokes the bar on start/stop so the ⏺
+    # appears/vanishes instantly (the interval is just a safety net).
+    "custom/recording" = {
+      exec = "nomarchy-record status";
+      return-type = "json";
+      interval = 10;
+      signal = 8;
+      on-click = "nomarchy-record stop";
+    };
+
     # Night-light (hyprsunset) indicator. Self-gates: the moon shows only while
     # the schedule runs; otherwise the status helper prints nothing => hidden
     # (enable / re-enable from the System menu). Click toggles instantly — writes
@@ -283,11 +296,14 @@ let
       font-weight: bold;
     }
 
-    #tray, #pulseaudio, #cpu, #memory, #custom-powerprofile, #custom-nightlight, #custom-updates, #custom-vpn, #language, #battery, #custom-notification {
+    #tray, #pulseaudio, #cpu, #memory, #custom-powerprofile, #custom-nightlight, #custom-updates, #custom-vpn, #custom-recording, #language, #battery, #custom-notification {
       color: alpha(@text, 0.85);
       padding: 0 10px;
     }
 
+    /* Recording in progress → the alert red; the ⏺ is also the stop button. */
+    #custom-recording.recording { color: @bad; }
+
     /* VPN active → accent green, reading as "connected / protected". */
     #custom-vpn.on { color: @good; }