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Each /instruments/:id navigation opens a persistent tab in the TabBar. Multiple instruments can be open simultaneously — state is preserved when switching. - TabsContext: adds instrumentIds[], openInstrument(), closeInstrument() - TabBar: renders instrument tabs (teal, monospaced, TrendingUp icon) after static tabs, separated by a divider - InstrumentDashboard: accepts instrumentIdProp so keep-alive instances use the right id regardless of URL - App: InstrumentRoute registers the tab on navigation; InstrumentKeepAlive mounts one dashboard per open instrument; NormalRoutes hides on instrument paths (hidden div, Routes still fires) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>