Hello and welcome,
Your dmesg logs show a critical firmware crash after sleep, which is why you're losing WiFi connection. The key indicators are:
Firmware version mismatch: The system tries to load iwlwifi-gl-c0-fm-c0-102.ucode (fails) but only has 101 available
Firmware reset failure after sleep: timeout waiting for FW reset ACK (inta_hw=0xffffffff, reset_done 1) — the WiFi chip firmware is hanging and won't recover
This is a driver/firmware issue specific to your Intel WiFi 7 BE200 card, not a power-saving configuration problem.
If you tried ubuntu 26.04 (I assume it was with latest ubuntu LTS kernel), you could try to upgrade kernel with mainline but be aware they are not signed and if you have dual boot with windows it could be a problem with secure boot.
So If you don't have dual boot you can try latest mainline kernel doing this tutorial and let your secure boot disable.