feat: jump_next and jump_prev check if cursor is jumpable

lua/neogen/init.lua

@@ -283,14 +283,18 @@ neogen.match_commands = helpers.match_commands
 --- Jumps to the next cursor template position
 ---@private
 function neogen.jump_next()
+    if neogen.jumpable() then
         cursor.jump()
     end
+end
 
 --- Jumps to the next cursor template position
 ---@private
 function neogen.jump_prev()
+    if cursor.jumpable(-1) then
         cursor.jump_prev()
     end
+end
 
 --- Checks if the cursor can jump backwards or forwards
 --- @param reverse number? if `-1`, will try to see if can be jumped backwards