In-view charts for events table; dashboard widgets open as tables

What's Changed

Features

• feat(charts): in-view charts for the v4 events table ("any view is a chart") by @nkabardin in https://github.com/langfuse/langfuse/pull/15187
• feat(dashboard): 'View as table' — navigate from a widget to the traces/observations table (LFE-11021) by @nkabardin in https://github.com/langfuse/langfuse/pull/15194
• feat(agent): Direct entrypoint in 'add widget' modal to use assistant to create dashboard widgets by @LysanderKie in https://github.com/langfuse/langfuse/pull/15162
• feat(filters): filter sidebar UX overhaul (LFE-10883) by @nkabardin in https://github.com/langfuse/langfuse/pull/15049

Fixes

• fix(agent): Support configuring egress network connector for sandbox by @bezbac in https://github.com/langfuse/langfuse/pull/15196

Full Changelog: https://github.com/langfuse/langfuse/compare/v3.220.0...v3.221.0