refactor(settings): extract settings header to component

- Create components/settings-header.tsx
- Move header section JSX to new component
- Update settings-view.tsx to use SettingsHeader component
- Remove unused Settings icon import
- Make header configurable with title and description props
- Reduce settings-view.tsx by ~16 lines
- Improve component modularity and reusability

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

app/src/components/views/settings-view/components/settings-header.tsx

@@ -0,0 +1,27 @@
+import { Settings } from "lucide-react";
+
+interface SettingsHeaderProps {
+  title?: string;
+  description?: string;
+}
+
+export function SettingsHeader({
+  title = "Settings",
+  description = "Configure your API keys and preferences",
+}: SettingsHeaderProps) {
+  return (
+    <div className="shrink-0 border-b border-border bg-glass backdrop-blur-md">
+      <div className="px-8 py-6">
+        <div className="flex items-center gap-3">
+          <div className="w-10 h-10 rounded-xl bg-linear-to-br from-brand-500 to-brand-600 shadow-lg shadow-brand-500/20 flex items-center justify-center">
+            <Settings className="w-5 h-5 text-primary-foreground" />
+          </div>
+          <div>
+            <h1 className="text-2xl font-bold text-foreground">{title}</h1>
+            <p className="text-sm text-muted-foreground">{description}</p>
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+}