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/src/nav.rs

@@ -106,14 +106,11 @@ fn find_in_inlines(inlines: &[InlineNode], line: u32, col: u32) -> Option<&Inlin
             InlineNode::Superscript(s) => find_in_inlines(&s.children, line, col),
             InlineNode::Subscript(s) => find_in_inlines(&s.children, line, col),
             InlineNode::Color(c) => find_in_inlines(&c.children, line, col),
-            InlineNode::WikiLink(w) => w
-                .description
-                .as_ref()
-                .and_then(|d| find_in_inlines(d, line, col)),
-            InlineNode::ExternalLink(e) => e
-                .description
-                .as_ref()
-                .and_then(|d| find_in_inlines(d, line, col)),
+            // Links are an atomic unit for navigation: a cursor anywhere in
+            // `[[target|description]]` (or `[desc](url)`) should resolve the
+            // link itself. Don't descend into the description — returning its
+            // inner Text node leaves goto-definition/references/hover with
+            // nothing to act on ("No locations found" when on the title).
             _ => None,
         };
         return Some(deeper.unwrap_or(n));