fix(flake): update Linux Chrome download - #30899

The Linux development shell downloads Chrome 143.0.7499.169 from a Google URL that now returns HTTP 404, preventing nix develop from realizing the environment.

Override Linux Chrome to 155.0.8059.84 with its verified download hash, without updating the nixpkgs inputs. Remove the pinned recipe's ANGLE-library patch step because this Chrome release no longer bundles those libraries. Darwin Chrome and the existing aarch64-linux exclusion are unchanged.

Verified the complete x86_64-linux development shell and a headless browser smoke test using Nix 2.35.3 in an isolated Docker container. Evaluated, but did not execute, the other three platforms.

$ sha256sum google-chrome.deb
8fbd2ae69cdf7ee98b7513c3396a7b5e06f974f8625fdd590df3091dd0c3e9de  google-chrome.deb

$ nix develop --no-write-lock-file --max-jobs 2 --cores 2 --command true
# Exit status: 0; full environment realized.

$ nix develop --no-write-lock-file --command google-chrome-stable --version
Google Chrome 155.0.8059.84

$ google-chrome-stable --headless --no-sandbox --disable-dev-shm-usage --disable-gpu --dump-dom about:blank
<html><head></head><body></body></html>
# Exit status: 0. --no-sandbox was used only for the root-run container smoke test.

AI-assisted implementation and validation using Xum. The model identifier was not exposed to this session.