Agent sandbox ships; search bar suggests facet filters

What's Changed

Features

• feat(search-bar): suggest matching facet filters for bare typed terms (LFE-10888) by @nkabardin in https://github.com/langfuse/langfuse/pull/15053
• feat(web): Show sentry error ID on crash page by @bezbac in https://github.com/langfuse/langfuse/pull/13310
• feat(agent): Add sandbox by @bezbac in https://github.com/langfuse/langfuse/pull/14712

Fixes

• fix(preview): advertise demo seed login in the preview PR comment by @maxdeichmann in https://github.com/langfuse/langfuse/pull/15131
• fix(v4): use trace TS to get traces, not obs ts by @nimarb in https://github.com/langfuse/langfuse/pull/15135
• fix(llm): keep internal reasoning options off compatible requests by @hassiebp in https://github.com/langfuse/langfuse/pull/15137
• fix(sentry): scope httpClientIntegration to stop capturing expected poll/health 5xx (LFE-10975) by @nkabardin in https://github.com/langfuse/langfuse/pull/15145
• fix(sessions): guard session-view trace-card I/O against non-array shape (regression from #15124) by @nkabardin in https://github.com/langfuse/langfuse/pull/15133
• fix(trace): collapse long system prompts on all render paths (LFE-10934) by @nkabardin in https://github.com/langfuse/langfuse/pull/15106

Chores

• chore(agent): add project url to metadata by @nimarb in https://github.com/langfuse/langfuse/pull/15136
• perf(preview): build web and worker images in parallel by @maxdeichmann in https://github.com/langfuse/langfuse/pull/15141
• docs(agents): add langfuse-previews skill by @maxdeichmann in https://github.com/langfuse/langfuse/pull/15128
• chore(preview): link the debug guide from the preview PR comment by @maxdeichmann in https://github.com/langfuse/langfuse/pull/15134
• ci(preview): reap stale PR preview environments after 3d inactivity by @maxdeichmann in https://github.com/langfuse/langfuse/pull/15140

Full Changelog: https://github.com/langfuse/langfuse/compare/v3.214.0...v3.215.0