* Tune MediaCodec static refresh budgets
Use H.264 budgets 50/20/20/10 and H.265 budgets 90/20/20/20 from MT6855 1080p measurements with early stopping at 80% of observed-best improvement, not full convergence.
Retain the existing H.265 low-quality budget because the line-pattern sample did not confirm convergence within 150 repeat calls. Keep the existing ten latency-draining repeats, other backends, and refresh timing unchanged.
Extend output-budget and backend-selection regression coverage. Static refresh tests pass with hwcodec (17 tests) and default features (16 tests).
* fix(video): retain the largest static refresh budget per frame