Live reasoning in agent; home dashboard customizable…

What's Changed

feat(rbac): let cloud admins view org & project settings pages by @Steffen911 in https://github.com/langfuse/langfuse/pull/14072
feat(agents): add posthog-instrumentation skill (LFE-10785) by @nkabardin in https://github.com/langfuse/langfuse/pull/14940
feat(assistant): show live reasoning in the in-app agent (LFE-10706) by @LysanderKie in https://github.com/langfuse/langfuse/pull/14878
feat(dashboard): make Home a dashboard — preset widgets, curated default, per-project selection (LFE-10693) by @nkabardin in https://github.com/langfuse/langfuse/pull/14824
feat(trace): graph view mode switcher — aggregated vs expanded as-it-ran DAG (LFE-10676) by @nkabardin in https://github.com/langfuse/langfuse/pull/14934

revert(evals): remove eval prompt_cache_key feature by @hassiebp in https://github.com/langfuse/langfuse/pull/14944
fix(prompts): suppress 404 warning toast during prompt version deletion by @Tkgmuuuu in https://github.com/langfuse/langfuse/pull/11665

Full Changelog: https://github.com/langfuse/langfuse/compare/v3.209.1...v3.210.0