fix(lsp): resolve links from anywhere in the link, including the title

goto-definition (and references/hover) reported "No locations found" when
the cursor was on the *description* of a piped link — `[[target|Title]]`
or `[desc](url)` — and only worked over the target/location part.

find_in_inlines descended into the link's description and returned its
inner Text node, so the nav handlers saw a Text (not a WikiLink/
ExternalLink) and bailed. A link is an atomic unit for navigation: stop
descending into descriptions so a hit anywhere in the link returns the
link node itself. Adds a navigation regression test for cursor-on-title.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

crates/nuwiki-lsp/tests/navigation.rs

@@ -201,6 +201,18 @@ fn find_inline_at_returns_wikilink_under_cursor() {
     assert!(matches!(node, InlineNode::WikiLink(_)));
 }
 
+#[test]
+fn find_inline_at_returns_wikilink_when_cursor_on_description() {
+    // Regression: pressing <CR> on the *title* part of a piped link used to
+    // descend into the description's Text node, so goto-definition saw a Text
+    // (not a WikiLink) and reported "No locations found".
+    let src = "see [[Other|My Title]] now\n";
+    let doc = parse(src);
+    // Byte col 16 is inside "Title" (the description), past the '|' at 11.
+    let node = find_inline_at(&doc, 0, 16).expect("wikilink at cursor");
+    assert!(matches!(node, InlineNode::WikiLink(_)));
+}
+
 #[test]
 fn find_inline_at_returns_none_for_plain_text() {
     let src = "just text\n";