chore: stop tracking generated dist artifacts

[OpensrcLord]

Summary

• Updates .gitignore to exclude dist/, build/, .next/, out/ directories
• Removes 130+ tracked dist files from version control
• Adds common CI/build artifact patterns to prevent future tracking

Closes #740

Test plan

• Verify dist/ is no longer tracked in new clones
• Confirm CI builds can still generate dist/ locally
• Run git status after npm run build shows dist/ as ignored

🤖 Generated with Claude Code

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[Manuelshub]

@OpensrcLord Please fix all the CI checks failure!

[OpensrcLord]

@Manuelshub Fixed the CI/install blockers on fix/issue-740: repaired malformed package metadata and lockfiles. The branch installs with a frozen pnpm lockfile and the production build passes. The remaining full-suite failures are pre-existing unrelated tests.