fix: GeminiService has unnecessary hardcoded 3-second delay in generatePrescription()

[SISIR-REDDY]

Description

In lib/features/transcription/data/gemini_service.dart, the generatePrescription() method has an arbitrary Future.delayed(const Duration(seconds: 3)) before making the API call:

Future<String> generatePrescription(String transcription) async {
    await Future.delayed(const Duration(seconds: 3)); // <-- WHY?
    return await _chatbotService.getGeminiResponse(
      "Generate a prescription based on the conversation in this transcription: $transcription",
    );
}

This adds 3 seconds of unnecessary wait time for every prescription generation. The summary generation method does NOT have this delay, so it appears unintentional.

Impact

• Users wait 3 extra seconds for every prescription
• On slow networks, combined with API latency, this makes the experience noticeably sluggish

Expected Fix

Remove the Future.delayed call. If rate limiting was the intent, it should be handled properly with retry logic or documented.