Improve local trace UX: flat span IDs, port-aware help, aggregated drill-down

Improve local trace UX: flat span IDs, port-aware help, aggregated drill-down targets a $24.0B = 3,000,000 engineering teams x $8,000 ACV (global developer-tools & observability spend portion) total addressable market with low saturation and a year-over-year growth rate of 12% (developer tools & observability market CAGR; higher for developer-experience niches).

Key trends driving demand: Monorepos & full-stack frameworks -- more cross-service local interactions create higher demand for dev-first tracing.; Developer productivity tooling -- teams prioritize tools that remove friction (fast feedback loops, copy-pasteable UX).; OpenTelemetry & standards -- standardized tracing formats lower integration cost and enable interoperability with cloud vendors.; Edge and server-rendered frontends -- distributed runtime complexity increases need for localized trace drill-down during development..