Remove glow effect from all images in dark mode plots

- Simplified CSS to just re-invert images without drop-shadow
- Logos are now designed to be visible without the glow effect

content.py

@@ -1143,23 +1143,10 @@ h3 .header-link-icon {
     filter: invert(0.88) hue-rotate(180deg);
 }
 
-/* Re-invert company logo images so they display correctly */
-/* Also add a light gray circular glow behind them for visibility */
-/* Exclude OpenHands logo (identified by openhands=logo MIME parameter) */
-.dark .js-plotly-plot .layer-above image:not([href*="openhands=logo"]):not([xlink\\:href*="openhands=logo"]),
-.dark .js-plotly-plot .imagelayer image:not([href*="openhands=logo"]):not([xlink\\:href*="openhands=logo"]) {
-    filter: invert(1) hue-rotate(180deg) 
-            drop-shadow(0 0 12px rgba(160, 165, 180, 0.95)) 
-            drop-shadow(0 0 8px rgba(160, 165, 180, 0.9));
-}
-
-/* OpenHands logo at bottom - no glow, just re-invert for dark mode */
-/* The logo is identified by openhands=logo MIME parameter in the data URI */
-.dark .js-plotly-plot .layer-above image[href*="openhands=logo"],
-.dark .js-plotly-plot .layer-above image[xlink\\:href*="openhands=logo"],
-.dark .js-plotly-plot .imagelayer image[href*="openhands=logo"],
-.dark .js-plotly-plot .imagelayer image[xlink\\:href*="openhands=logo"] {
-    filter: invert(1) hue-rotate(180deg) !important;
+/* Re-invert all images so they display correctly (no glow) */
+.dark .js-plotly-plot .layer-above image,
+.dark .js-plotly-plot .imagelayer image {
+    filter: invert(1) hue-rotate(180deg);
 }
 
 /* Modebar icons need re-inversion */