style(css): 调整 z-index 和过渡效果格式化，优化背景颜色混合属性

Author: isHidden

resources/webview.css

@@ -324,7 +324,7 @@ body {
   flex-shrink: 0;
   margin-top: 6px;
   position: relative;
-  z-index: 10;
+  z-index: 3;
 }
 
 .bubble-dot.success {
@@ -402,7 +402,9 @@ body {
   pointer-events: none;
   opacity: 0;
   visibility: hidden;
-  transition: opacity 0.5s, visibility 0.5s;
+  transition:
+    opacity 0.5s,
+    visibility 0.5s;
 }
 
 .tooltip.show {
@@ -530,11 +532,19 @@ body {
 }
 
 .diff-line.added {
-  background: color-mix(in srgb, var(--vscode-diffEditor-insertedLineBackground, rgba(46, 160, 67, 0.18)) 100%, transparent);
+  background: color-mix(
+    in srgb,
+    var(--vscode-diffEditor-insertedLineBackground, rgba(46, 160, 67, 0.18)) 100%,
+    transparent
+  );
 }
 
 .diff-line.removed {
-  background: color-mix(in srgb, var(--vscode-diffEditor-removedLineBackground, rgba(248, 81, 73, 0.16)) 100%, transparent);
+  background: color-mix(
+    in srgb,
+    var(--vscode-diffEditor-removedLineBackground, rgba(248, 81, 73, 0.16)) 100%,
+    transparent
+  );
 }
 
 .diff-line.context {
@@ -788,7 +798,10 @@ body {
   border-radius: 4px;
   border: 1px solid var(--border-color);
   background: var(--vscode-input-background);
-  transition: border-color 0.15s ease, outline-color 0.15s ease, background-color 0.15s ease;
+  transition:
+    border-color 0.15s ease,
+    outline-color 0.15s ease,
+    background-color 0.15s ease;
 }
 
 .input-wrap:focus-within {
@@ -1011,7 +1024,6 @@ textarea::placeholder {
   font-weight: 600;
   margin-bottom: 10px;
 }
-
 .context-tooltip-section {
   margin-top: 10px;
   padding-top: 8px;
@@ -1205,7 +1217,7 @@ textarea::placeholder {
   min-width: 0;
 }
 
-.skills-tags-inner{
+.skills-tags-inner {
   width: 100%;
   overflow: auto;
   white-space: nowrap;