fix(theme): generated waybar/rofi CSS invisible on on-surface palettes (item 27)

Follow-on to the swaync fix (a643391): the generated Waybar CSS colored
the module row and #window @subtext and dim states @muted, and the
generated rofi theme put @fg text on @surface chips — invisible where
palettes use those roles as "on-surface" (flexoki-light: subtext==base,
surface==text; gruvbox: muted/base = 1.27). flexoki-light has no
whole-swap, so it ran this CSS. Generated surfaces only — the summer
whole-swaps are hand-authored and untouched.

- waybar: secondary text → alpha(@text, 0.85); dim states (inactive
  workspaces, DND bell, muted volume) → alpha(@text, 0.5).
- rofi: @dim → text+"80", @surface → text+"1a" (#RRGGBBAA fg tints).
- check-theme-contrast.py pairings/docs now cover all three generated
  surfaces; status glyphs (good/warn/bad on base, worst 2.05) are
  deliberately not held to a text ratio — raising them is palette
  design, a human decision.

Verified: V0; V1 (checks.theme-contrast green over 21 themes;
downstream-template-home builds; rendered waybar style has zero
@subtext/@muted/@surface; rendered custom.rasi shows fg-derived
tints). Honesty: NOT visually verified — V3 queued (flexoki-light
eyeball + dark-theme regression spot-check).

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

modules/home/waybar.nix

@@ -253,9 +253,13 @@ let
       border-radius: ${toString t.ui.rounding}px;
     }
 
+    /* Dim/secondary shades are alpha(@text) tints, NOT the palette's
+       subtext/muted roles — those mean "on-surface" in some palettes
+       (flexoki-light: subtext==base, gruvbox: muted≈base) and vanish
+       against the bar (item 27; tools/check-theme-contrast.py). */
     #workspaces button {
       padding: 0 8px;
-      color: @muted;
+      color: alpha(@text, 0.5);
       border-radius: ${toString t.ui.rounding}px;
     }
 
@@ -270,7 +274,7 @@ let
     }
 
     #window {
-      color: @subtext;
+      color: alpha(@text, 0.85);
       padding: 0 12px;
     }
 
@@ -280,7 +284,7 @@ let
     }
 
     #tray, #pulseaudio, #cpu, #memory, #custom-powerprofile, #custom-nightlight, #custom-updates, #custom-vpn, #language, #battery, #custom-notification {
-      color: @subtext;
+      color: alpha(@text, 0.85);
       padding: 0 10px;
     }
 
@@ -300,9 +304,9 @@ let
     /* notifications waiting → accent; Do-Not-Disturb → muted bell-off */
     #custom-notification.notification { color: @accent; }
     #custom-notification.dnd-none,
-    #custom-notification.dnd-notification { color: @muted; }
+    #custom-notification.dnd-notification { color: alpha(@text, 0.5); }
 
-    #pulseaudio.muted { color: @muted; }
+    #pulseaudio.muted { color: alpha(@text, 0.5); }
     #battery.warning { color: @warn; }
     #battery.critical { color: @bad; }
     #battery.charging { color: @good; }