bluetooth: Increase TemporaryTimeout to 195 seconds (#4249)

Increase the BlueZ temporary device timeout from the default 30s to 195s.
This prevents devices from being removed from D-Bus during connection
retries, especially when multiple connection attempts are queued.

The 195s timeout aligns with Home Assistant's Bluetooth stack behavior
for ESPHome proxies and prevents the 'device removal spiral' that occurs
when devices timeout during sequential connection attempts.

Author: bdraco

buildroot-external/rootfs-overlay/etc/bluetooth/main.conf

@@ -1,5 +1,9 @@
 [General]
 Experimental=true
+# Increase temporary device timeout from 30s to 195s to prevent device
+# removal during connection retries and to align with Home Assistant's
+# Bluetooth stack expectations
+TemporaryTimeout=195
 
 [Policy]
 AutoEnable=true