chore: fix bugs, cleanup dead code, add CI and firefox user.js

[simply-sharat]

• hypr/scripts/wsaction.fish: fix incorrect set -e $argv[1] syntax
• hypr/scripts/configs.fish: fix if _reload using var as command
• starship.toml: fix typo 'ellow' -> 'yellow'
• zen/userChrome.css: remove ~90 lines of commented-out dead code
• README.md: fix install.sh reference to install.fish
• hypr/hyprland/rules.conf: clean up messy comment
• PKGBUILD: add missing ydotool dependency
• install.fish: remove deprecated yay -Y flags, fix help text
• vscode/settings.json: remove wildcard from codeium config for privacy
• firefox: add user.js with privacy/security/performance tweaks
• .github: add CI workflow with fish syntax check and CSS lint
• hypr/env.conf + uwsm/env-hyprland: add sync comments for duplicated vars

[simply-sharat]

• hypr/scripts/wsaction.fish: fix set -e $argv[1] → set -e argv[1]
• hypr/scripts/configs.fish: fix if _reload → if $_reload
• starship.toml: fix typo ellow → yellow
• zen/userChrome.css: remove ~90 lines of commented-out dead code
• README.md: fix install.sh → install.fish in help output
• hypr/hyprland/rules.conf: clean up messy comment
• PKGBUILD: add missing ydotool dependency
• install.fish: remove deprecated yay -Y flags, fix help text
• vscode/settings.json: remove wildcard from codeium.enableConfig
• firefox: add user.js with privacy/security/performance tweaks
• .github: add CI workflow with fish syntax check and CSS lint
• hypr/env.conf + uwsm/env-hyprland: add sync comments for duplicated vars

[dxnnv]

Some of these feel more opinionated than just chores. Things like Firefox configurations for changing suggestions, disabling formfill, enabling media hardware acceleration, etc. are just assuming every user that's currently using these dots wants those changes. While I understand changes for privacy and security are beneficial, this seems to border on going out of scope.