feat: add URL content extraction for AI diagram generation

lib/url-utils.ts

@@ -0,0 +1,29 @@
+export interface UrlData {
+    url: string
+    title: string
+    content: string
+    charCount: number
+    isExtracting: boolean
+}
+
+export async function extractUrlContent(url: string): Promise<UrlData> {
+    const response = await fetch("/api/parse-url", {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ url }),
+    })
+
+    if (!response.ok) {
+        const error = await response.json().catch(() => null)
+        throw new Error(error?.error || "Failed to extract URL content")
+    }
+
+    const data = await response.json()
+    return {
+        url,
+        title: data.title,
+        content: data.content,
+        charCount: data.charCount,
+        isExtracting: false,
+    }
+}