test: cover ~5KB nowhere-link fragments end-to-end through the parser

commons/src/commonTest/kotlin/com/vitorpamplona/amethyst/commons/richtext/RichTextParserTest.kt

@@ -4420,6 +4420,23 @@ class RichTextParserTest {
         assertEquals("m", nowhere?.tool)
     }
 
+    @Test
+    fun testNowhereLinkWithLargeBase64UrlFragment() {
+        // Real nowhere links can be kilobytes long (a full store catalogue or forum thread
+        // base64url-encoded). Verify both UrlDetector capture and our classifier survive a
+        // ~5KB fragment containing every base64url-legal character (A-Z, a-z, 0-9, -, _).
+        val alphabet = ('A'..'Z').joinToString("") + ('a'..'z').joinToString("") + ('0'..'9').joinToString("") + "-_"
+        val payload = (0 until 80).joinToString("") { alphabet }
+        val url = "https://nowhr.xyz/s#$payload"
+        val text = "look at this big store $url and reply"
+        val state = RichTextParser().parseText(text, EmptyTagList, null)
+        val nowhere = state.paragraphs.flatMap { it.words }.firstOrNull { it is NowhereLinkSegment } as? NowhereLinkSegment
+        assertEquals(url, nowhere?.segmentText)
+        assertEquals(payload.length, nowhere?.segmentText?.substringAfter('#')?.length)
+        assertEquals("nowhr.xyz", nowhere?.host)
+        assertEquals("s", nowhere?.tool)
+    }
+
     @Test
     fun testPlainNowhereHostWithoutFragmentStaysAsLink() {
         // No fragment => not a nowhere site, fall through to LinkSegment.