gui: allow models allocation

1 job for gui in 38 seconds (queued for 1 second)
Name Stage Failure
failed
build Build
 1131 |         it.node->next = next;
| ~~~^~~~
../lib/include/irritator/core.hpp:814:20: note: declared private here
814 | node_type* node{ nullptr };
| ^~~~
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ERROR: Job failed: exit code 1