feat: Implement draggable Trendline Settings Panel with Shift+Click and TF layout fixes

css/refined.css

@@ -217,3 +217,51 @@ body {
     }
 }
 
+/* Trendline Settings Panel */
+#trendlineSettingsPanel input[type=range] {
+    -webkit-appearance: none; 
+    background: transparent; 
+}
+
+#trendlineSettingsPanel input[type=range]::-webkit-slider-thumb {
+    -webkit-appearance: none;
+    height: 12px;
+    width: 12px;
+    border-radius: 50%;
+    background: #ffffff;
+    cursor: pointer;
+    border: 2px solid #1a2333; 
+    margin-top: -4px; 
+}
+
+#trendlineSettingsPanel input[type=range]::-webkit-slider-runnable-track {
+    width: 100%;
+    height: 4px;
+    cursor: pointer;
+    background: #2d3a4f;
+    border-radius: 2px;
+}
+
+.color-swatch {
+    width: 20px;
+    height: 20px;
+    border-radius: 3px;
+    cursor: pointer;
+    border: 1px solid transparent;
+    transition: transform 0.1s, border-color 0.1s;
+}
+
+.color-swatch:hover {
+    transform: scale(1.1);
+    border-color: #ffffff;
+}
+
+.color-swatch.active {
+    border-color: #ffffff;
+    box-shadow: 0 0 0 1px #ffffff;
+}
+
+.tl-thickness-btn[data-active="true"], 
+.tl-style-btn[data-active="true"] {
+    background-color: #2d3a4f;
+}