feat: instrument analysis

frontend/src/context/TabsContext.tsx

@@ -1,4 +1,7 @@
-import { createContext, useContext, useCallback, useState, ReactNode } from 'react'
+import { createContext, useContext, useCallback, useState, useEffect, ReactNode } from 'react'
+
+// Instruments that exist in instruments.json — used to validate localStorage
+const VALID_INSTRUMENT_SUFFIX = /^[A-Z0-9]+=?[A-Z0-9-]*$/
 
 interface TabsCtx {
   kept:            ReadonlySet<string>