Add border to theme toggle for better visibility

- Add 2px border to toggle switch with rgba(0,0,0,0.25) in light mode
- Change border to rgba(255,255,255,0.3) in dark mode for better contrast
- Add border-color to transition properties for smooth color change
- Toggle now stands out against both light and dark sidebar backgrounds

Co-authored-by: chrismaddalena <10526228+chrismaddalena@users.noreply.github.com>

Author: Copilot

ghostwriter/templates/base_generic.html

@@ -427,9 +427,10 @@
                 right: 0;
                 bottom: 0;
                 background: linear-gradient(135deg, #87CEEB 0%, #f46036 100%);
-                transition: background 0.5s ease;
+                transition: background 0.5s ease, border-color 0.5s ease;
                 border-radius: 40px;
                 overflow: hidden;
+                border: 2px solid rgba(0, 0, 0, 0.25);
               }
 
               /* Sun */
@@ -562,6 +563,7 @@
               /* Checked state (Dark mode) */
               input:checked + .theme-slider {
                 background: linear-gradient(135deg, #1c2135 0%, #2c3150 100%);
+                border-color: rgba(255, 255, 255, 0.3);
               }
 
               input:checked + .theme-slider .sun {