fix(rendering): stabilize bloom and compute support

[ZhuRuoLing]

Summary

• keep bloom render targets synchronized with the main target size
• restore render state reliably and log bloom failures
• guard compute test paths on unsupported devices

Verification

• sh gradlew :anvillib-rendering-neoforge-26.1:compileJava :anvillib-test-neoforge-26.1:compileJava

[Gugle2308]

🌿 Roseau API Breaking Change Report

Module	Status	Breaking Changes
codec	✅ Compatible	0
collision	✅ Compatible	0
config	✅ Compatible	0
integration	✅ Compatible	0
moveable-entity-block	✅ Compatible	0
network	✅ Compatible	0
rendering	✅ Compatible	0
space-select	✅ Compatible	0
font	✅ Compatible	0
util	✅ Compatible	0
explosion	✅ Compatible	0
rpc	✅ Compatible	0
multiblock	✅ Compatible	0
recipe	✅ Compatible	0
registrum	✅ Compatible	0
sync	✅ Compatible	0
wheel	✅ Compatible	0
main	✅ Compatible	0

Full CSVs: see the Artifacts section of this workflow run.