Move the click-path hyperlink lookup onto View

Reading a view's internal buffer belongs on the view itself, next to
findHyperlinkAt, rather than in the event loop; and the view is where the
lock that guards that buffer can be taken.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

pkg/gocui/gui.go

@@ -1763,10 +1763,8 @@ func (g *Gui) onKey(ev *GocuiEvent) error {
 		}
 
 		if ev.Key.KeyName() == MouseLeft && (ev.Key.Mod()&ModMotion) == 0 && !v.Editable && g.openHyperlink != nil {
-			if newY >= 0 && newY <= len(v.viewLines)-1 && newX >= 0 && newX <= len(v.viewLines[newY].line)-1 {
-				if link := v.viewLines[newY].line[newX].hyperlink; link != "" {
-					return g.openHyperlink(link, v.name)
-				}
+			if link := v.hyperlinkAt(newX, newY); link != "" {
+				return g.openHyperlink(link, v.name)
 			}
 		}
 

pkg/gocui/view.go

@@ -2116,6 +2116,16 @@ func (v *View) onMouseMove(x int, y int) {
 	}
 }
 
+// hyperlinkAt returns the hyperlink at the given position of the view's
+// content, or an empty string if there is none.
+func (v *View) hyperlinkAt(x, y int) string {
+	if y < 0 || y >= len(v.viewLines) || x < 0 || x >= len(v.viewLines[y].line) {
+		return ""
+	}
+
+	return v.viewLines[y].line[x].hyperlink
+}
+
 func (v *View) findHyperlinkAt(x, y int) *SearchPosition {
 	linkStr := v.viewLines[y].line[x].hyperlink
 	if linkStr == "" {