v4.8.0

What's Changed

• feat(chat-sidebar): skip dot-prefixed files in context picker by @pjdoland in #221
• harden(skills): block + scope redirects on remote skill fetches by @pjdoland in #203
• feat(skills): add allow_github_skill_import traitlet to gate GitHub imports by @pjdoland in #222
• fix(config): atomic NBIConfig.save() to prevent corruption on crash by @pjdoland in #202
• feat(chat-sidebar): extensible workspace picker filters + .gitignore by @pjdoland in #223
• perf(chat-sidebar): parallelize workspace file scan in @-mention picker by @pjdoland in #227
• touch ups for 4.8.0 release by @mbektas in #228

Full Changelog: v4.7.0...v4.8.0