fix(theme): mop-up per-skin nits — ratio bar + light-skin muted text

Lower-severity polish from the per-skin review:
- Market portfolio ratio bar: was full-saturation Success/Warning at a208 over a
  white a10 track — the green read as "neon" on dark skins and the track was
  invisible on light skins. Make it theme-aware: muted fills (a165) on dark, a
  dark track on light so the bar is defined on white/pastel surfaces.
- Light-skin muted text: bump --on-surface-disabled 0.52 -> 0.62 on light/
  color-pop-light/dune/marble/iridescent so secondary text (addresses, category
  labels) clears the pastel/gradient backgrounds (analog of the dark-skin bump).

Remaining review nits are the "white-overlay-assumes-dark" track/hover pattern
(a broader separate sweep) and per-skin aesthetic trade-offs; deferred.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/ui/windows/market_tab.cpp

@@ -1738,16 +1738,20 @@ static void mktDrawPortfolio(const MktCtx& cx)
         float transpW   = barW - shieldedW;
         ImVec2 barStart(cx0, cy);
 
+        // Theme-aware: a dark track (not an invisible white one) on light skins, and slightly muted
+        // fills on dark skins where full-saturation Success/Warning read as a neon bar.
+        const bool barLight = IsLightTheme();
+        const int  fillA    = barLight ? 205 : 165;
         dl->AddRectFilled(barStart, ImVec2(barStart.x + barW, barStart.y + ratioBarH),
-                          IM_COL32(255, 255, 255, 10), 3.0f);
+                          barLight ? IM_COL32(0, 0, 0, 20) : IM_COL32(255, 255, 255, 10), 3.0f);
         if (shieldedW > 0.5f)
             dl->AddRectFilled(barStart, ImVec2(barStart.x + shieldedW, barStart.y + ratioBarH),
-                              WithAlpha(Success(), 200),
+                              WithAlpha(Success(), fillA),
                               transpW > 0.5f ? ImDrawFlags_RoundCornersLeft : ImDrawFlags_RoundCornersAll, 3.0f);
         if (transpW > 0.5f)
             dl->AddRectFilled(ImVec2(barStart.x + shieldedW, barStart.y),
                               ImVec2(barStart.x + barW, barStart.y + ratioBarH),
-                              WithAlpha(Warning(), 200),
+                              WithAlpha(Warning(), fillA),
                               shieldedW > 0.5f ? ImDrawFlags_RoundCornersRight : ImDrawFlags_RoundCornersAll, 3.0f);
 
         // market_pct_shielded is "%.0f%% Shielded" — pass a double (an int to %f is UB).