refactor(context): expose provider config type and instruction flags in TTS value

Update TTS context to include configProviderType, supportsInstructions, and
ttsInstructions in the provided value, improving downstream access to provider
capabilities and instruction handling.

src/contexts/TTSContext.tsx

@@ -2264,6 +2264,9 @@ export function TTSProvider({ children }: { children: ReactNode }): ReactElement
     effectiveNativeSpeed,
     configProviderRef,
     ttsModel,
+    configProviderType,
+    providerModelPolicy.supportsInstructions,
+    ttsInstructions,
     isEPUB,
     currDocPage,
     currDocPageNumber,