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/rofi.nix

@@ -696,8 +696,13 @@ in
           "*" = {
             bg = mkLiteral c.base;
             fg = mkLiteral c.text;
-            dim = mkLiteral c.subtext;
-            surface = mkLiteral c.surface;
+            # @dim/@surface are fg-derived #RRGGBBAA tints, NOT the
+            # palette's subtext/surface roles — "on-surface" palettes
+            # (flexoki-light: subtext==base, surface==text) made the
+            # inputbar, textbox and alternate rows invisible (item 27;
+            # guarded by tools/check-theme-contrast.py).
+            dim = mkLiteral (c.text + "80");
+            surface = mkLiteral (c.text + "1a");
             accent = mkLiteral c.accent;
 
             background-color = mkLiteral "transparent";