fix(waybar,menu): #51 doctor indicator glyph + CC rebuild hints + scroll

Doctor Waybar indicator now emits a non-empty glyph (󰒡) + class:bad when
unhealthy (was "text":"" → self-hidden, so the tripwire never showed);
Control Center appearance toggles (blur/gaps) print "(requires rebuild)"
matching the other CC toggles; summer-day workspace scroll e±1 → r±1 to
match every other bar.

Worktree agent; diff reviewed + cherry-picked. V0 flake check + V1
(HM generation, nomarchy-control-center build). V2 render folded into #44.

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

modules/home/waybar.nix

@@ -120,7 +120,7 @@ let
     out=$(nomarchy-doctor 2>/dev/null) && exit 0
     tip=$(printf '%s\n' "$out" | grep '✖' | head -5 \
       | ${pkgs.jq}/bin/jq -Rs 'rtrimstr("\n") + "\n(click for the full sheet)"')
-    printf '{"text":"","tooltip":%s,"class":"bad"}\n' "$tip"
+    printf '{"text":"󰒡","tooltip":%s,"class":"bad"}\n' "$tip"
   '';
 
   # Per-theme override probe.