feat(extension): refine error UI and branding (#89)

extension/entrypoints/popup/App.css

@@ -208,16 +208,42 @@ h1 {
   gap: 12px;
 }
 
-.troubleshoot-box {
-  background: var(--border);
+.error-header {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+}
+
+.error-title {
+  font-size: 16px;
+  font-weight: 600;
+  margin: 0;
+  color: var(--fg);
+}
+
+.error-description {
+  font-size: 12px;
+  color: var(--fg-secondary);
+  margin: 0;
+  line-height: 1.5;
+}
+
+.action-grid {
+  display: grid;
+  gap: 12px;
+}
+
+.action-card {
+  border: 1px solid var(--border);
+  border-radius: 8px;
   padding: 12px;
-  border-radius: 6px;
   display: flex;
   flex-direction: column;
   gap: 8px;
+  background: #fafafa;
 }
 
-.troubleshoot-title {
+.action-title {
   font-size: 11px;
   font-weight: 600;
   color: var(--fg-secondary);
@@ -226,31 +252,31 @@ h1 {
   letter-spacing: 0.05em;
 }
 
-.troubleshoot-actions {
-  display: flex;
-  align-items: center;
-  gap: 8px;
+.action-text {
   font-size: 13px;
+  color: var(--fg);
+  margin: 0;
+  line-height: 1.5;
 }
 
-.link-button {
-  background: none;
-  border: none;
-  padding: 0;
-  color: var(--accent);
-  text-decoration: none;
+.secondary-button {
+  border: 1px solid var(--fg);
+  border-radius: 8px;
+  padding: 8px 10px;
+  font-size: 12px;
   font-weight: 500;
   cursor: pointer;
-  font-family: inherit;
-  font-size: inherit;
+  background: transparent;
+  color: var(--fg);
+  text-decoration: none;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: fit-content;
 }
 
-.link-button:hover {
-  text-decoration: underline;
-}
-
-.divider {
-  color: var(--fg-secondary);
+.secondary-button:hover {
+  background: var(--border);
 }