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>
