feat(bar): group rhythm + semantic @muted dim states (item 28c)

Two polish items from the 1080p review. The right cluster gains a
wider breath (margin-left 14px) before each functional group — media
(pulseaudio/cpu/memory), toggles (powerprofile/nightlight/language),
status (battery/updates/notification); a self-hiding group head
degrades to the uniform spacing. Dim states (inactive workspaces, DND
bell, muted volume) move from alpha(@text, 0.5) tints to the
palette's @muted role — safe now that 28b floor-gates muted/base >=
2.0 in every theme; the CSS comment that warned against @muted
documented the pre-28b palettes and now states the new invariant.
Whole-swap bars untouched (authored identity).

Verified: V0; V1 (rendered CSS carries the rule + 4 @muted uses);
visual — tokyo-night 1080p re-capture shows the themed backdrop
(iteration #35's fix, navy not black), the group gap, and legible
muted workspaces.

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

agent/JOURNAL.md

@@ -17,6 +17,26 @@ Template:
 
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+## 2026-07-05 — bar group rhythm + @muted adoption (iteration #36, item 28c)
+- **Task:** item 28 slice (c) — the two queued bar polish items.
+- **Did:** waybar.nix generated CSS: margin-left 14px on the three
+  right-cluster group heads (pulseaudio/powerprofile/battery — media
+  · toggles · status; hidden heads degrade to uniform spacing);
+  workspaces buttons, dnd bell, and muted volume moved from
+  alpha(@text,.5) tints to the semantic @muted role — safe since 28b
+  floor-gates muted/base ≥ 2.0 (the old comment warning against
+  @muted documented the pre-28b world; rewritten to state the new
+  invariant). Whole-swap bars untouched (authored identity).
+- **Verified:** V0; V1 rendered CSS has 4 @muted uses + the margin
+  rule; VISUAL — tokyo-night re-capture: themed backdrop confirmed
+  (navy base, not black), group gap visible before the volume group,
+  workspace pill legible. Cross-theme minima are guaranteed by the
+  gated checker rather than per-theme eyeballs.
+- **Pending:** slice-c remainder: rofi hint column, summer-rasi
+  placeholder dim, icon-weight `[human]`, latte/identity captures.
+- **Next suggestion:** rofi keybind-hint column (the biggest
+  remaining UX win), or the two-line placeholder nit as a quickie.
+
 ## 2026-07-05 — summer-day capture review + themed backdrop (iteration #35, item 28c)
 - **Task:** item 28 slice (c) — whole-swap capture review + the first
   cheap polish fix.