Add Arch Linux build support with pacman target

[perminder-klair]

• Add pacman target to electron-builder Linux configuration
• Configure Arch-specific dependencies (gtk3, libnotify, nss, etc.)
• Add dedicated build scripts: build:arch, release:arch, canary:arch
• Update documentation with bsdtar dependency requirements
• Add installation instructions for Arch Linux users
• Create PKGBUILD.example template for AUR maintainers
• Successfully tested pacman package generation

🤖 Generated with Claude Code

Description

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Performance improvement
• Code refactoring

Checklist

• I have read the CONTRIBUTING.md guidelines
• My code follows the code style of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have run pnpm typecheck and pnpm lint locally
• I have tested the Electron app locally with pnpm electron-dev

Critical Areas Modified

• Session output handling (requires explicit permission)
• Timestamp handling
• State management/IPC events
• Diff viewer CSS

Screenshots (if applicable)

Additional Notes

[jordan-BAIC]

@perminder-klair you will want to update the github actions as well so this builds on github. Are you in the Crystal discord? I can add you to the contributors channel?

[perminder-klair]

@jordan-BAIC sure, can you please share discord. thanks!

[jordan-BAIC]

@perminder-klair

@jordan-BAIC sure, can you please share discord. thanks!
https://discord.gg/XrVa6q7DPY