feat: Full UI internationalization, pool hashrate stats, and layout caching

- Replace all hardcoded English strings with TR() translation keys across
  every tab, dialog, and component (~20 UI files)
- Expand all 8 language files (de, es, fr, ja, ko, pt, ru, zh) with
  complete translations (~37k lines added)
- Improve i18n loader with exe-relative path fallback and English base
  fallback for missing keys
- Add pool-side hashrate polling via pool stats API in xmrig_manager
- Introduce Layout::beginFrame() per-frame caching and refresh balance
  layout config only on schema generation change
- Offload daemon output parsing to worker thread
- Add CJK subset fallback font for Chinese/Japanese/Korean glyphs

src/ui/effects/acrylic.cpp

@@ -572,12 +572,12 @@ void AcrylicMaterial::drawRect(ImDrawList* drawList, const ImVec2& pMin, const I
     float u1 = localX1 / viewportWidth_;
     float v1 = 1.0f - localY1 / viewportHeight_;  // V at bottom-right (low)
     
-    // Draw the blurred background.  The glass opacity comes from
-    // fallbackColor.w — blur always renders at full strength.
-    // UI opacity is handled separately by card surface alpha.
+    // Draw the blurred background.  Scale by both the glass preset
+    // opacity (fallbackColor.w) AND the user's UI opacity slider so
+    // that lowering card opacity lets the sharp background through.
     ImTextureID blurTex = getBlurredTexture();
     uint8_t glassAlpha = static_cast<uint8_t>(
-        std::min(255.0f, std::max(0.0f, params.fallbackColor.w * 255.0f)));
+        std::min(255.0f, std::max(0.0f, params.fallbackColor.w * settings_.uiOpacity * 255.0f)));
 
     if (blurTex) {
         drawList->AddImageRounded(
@@ -774,11 +774,11 @@ AcrylicFallback AcrylicMaterial::detectFallback() const
 void AcrylicMaterial::drawTintedRect(ImDrawList* drawList, const ImVec2& pMin, const ImVec2& pMax,
                                       const AcrylicParams& params, float rounding)
 {
-    // Draw semi-transparent tint without blur
-    // This is the "Tinted Only" fallback mode (not affected by UI opacity)
+    // Draw semi-transparent tint without blur — scale by UI opacity
+    // so the tinted fallback also respects the card transparency slider.
     ImU32 tintCol = ImGui::ColorConvertFloat4ToU32(
         ImVec4(params.tintColor.x, params.tintColor.y, params.tintColor.z, 
-               params.tintColor.w * params.tintOpacity * 0.9f)
+               params.tintColor.w * params.tintOpacity * 0.9f * settings_.uiOpacity)
     );
     drawList->AddRectFilled(pMin, pMax, tintCol, rounding);
     
@@ -1528,11 +1528,11 @@ void AcrylicMaterial::drawRect(ImDrawList* drawList, const ImVec2& pMin, const I
                (void*)blurTex, u0, v0, u1, v1);
     }
 
-    // Draw the blurred background.  Glass opacity from fallbackColor
-    // alpha.  Blur always renders at full strength; UI opacity is
-    // handled separately by card surface alpha.
+    // Draw the blurred background.  Scale by both the glass preset
+    // opacity (fallbackColor.w) AND the user's UI opacity slider so
+    // that lowering card opacity lets the sharp background through.
     uint8_t glassAlpha = (uint8_t)std::min(255.f,
-        std::max(0.f, params.fallbackColor.w * 255.f));
+        std::max(0.f, params.fallbackColor.w * settings_.uiOpacity * 255.f));
 
     if (blurTex) {
         drawList->AddImageRounded(
@@ -1559,7 +1559,7 @@ void AcrylicMaterial::drawTintedRect(ImDrawList* drawList, const ImVec2& pMin, c
 {
     ImU32 tintCol = ImGui::ColorConvertFloat4ToU32(
         ImVec4(params.tintColor.x, params.tintColor.y, params.tintColor.z,
-               params.tintColor.w * params.tintOpacity * 0.9f));
+               params.tintColor.w * params.tintOpacity * 0.9f * settings_.uiOpacity));
     drawList->AddRectFilled(pMin, pMax, tintCol, rounding);
 
     // Noise grain overlay — single draw call via pre-tiled texture

src/ui/effects/theme_effects.h

@@ -105,6 +105,12 @@ public:
     bool hasSandstorm()        const { return enabled_ && sandstorm_.enabled; }
     bool hasViewportOverlay()  const { return enabled_ && (viewport_overlay_.colorWashEnabled || viewport_overlay_.vignetteEnabled); }
 
+    /// True when any per-panel visual effect is active (rainbow, shimmer, specular, edge, ember, gradient)
+    bool hasAnyPanelEffect() const {
+        return hasRainbowBorder() || hasShimmer() || hasSpecularGlare()
+            || hasEdgeTrace() || hasEmberRise() || hasGradientBorder();
+    }
+
     /// True when any time-dependent effect is active and needs continuous redraws
     bool hasActiveAnimation() const {
         if (!enabled_) return false;