fix(app): add URL length limit (2048 chars) to extractUrlFromText

Prevents processing excessively long URLs in content extraction.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/app/src/composables/contentExtraction.ts

@@ -27,8 +27,10 @@ function extractUrlFromText(text: string): string | undefined {
   const mdLink = /\[([^\]]*)\]\((https?:\/\/[^)]+)\)/.exec(text)
   const raw = mdLink ? mdLink[2] : (/(https?:\/\/[^\s)\]"'<>]+)/.exec(text)?.[1])
   if (!raw?.trim()) return undefined
+  const trimmed = raw.trim()
+  if (trimmed.length > 2048) return undefined
   try {
-    const u = new URL(raw.trim())
+    const u = new URL(trimmed)
     if (!/^https?:$/i.test(u.protocol)) return undefined
     return u.href
   } catch {