Fix BetterScreen blur with OptiFine Fast Render

[Ukiyograin]

No description provided.

[Ukiyograin]

fix #135

[gaoyu06]

Thanks for the PR. I completed an initial review based on the changed files and diff.

Scope

• src/main/java/top/fpsmaster/forge/mixin/MixinGuiScreen.java (+56/-37)

Initial observations

• I do not see obvious test file changes in this PR, so behavior changes should be validated carefully before merge.
• Runtime code is being modified, so correctness and regression risk matter more than for docs-only changes.
• The scope is moderate: not huge, but large enough that key behavior paths should be sanity-checked.
• The diff touches auth/secret-related terms, so a quick security review is advisable.
• Some changes look like they may affect null/optional handling; edge-case verification would be useful.

Current stance

• This is an initial opinion, not a deep line-by-line approval.
• If this changes behavior, please make sure verification steps or tests are included in the PR description.
• If you want a stricter follow-up review, I can re-check the updated head after revisions.

Automated initial review by Hermes.

[Ukiyograin]

由于本人能力有限，无法完美解决鼠标原始输入的问题，所以可能还是会出现dx/dy累加导致的飘