Toggle conversation recording via glasses right-side button with AGiXT summarization

[Copilot]

Right-side button on Even Realities G1 glasses now toggles continuous recording. First press starts recording, second press stops and sends the transcription to AGiXT with a structured prompt to extract conversation summary, notes, goals, and action items.

Changes (lib/services/ai_service.dart)

• handleSideButtonPress() — Converted from single-shot 5-second recording to toggle behavior. Checks _isConversationRecording to decide start vs stop. Recording uses 30-minute max duration (manually stopped by second press).
• _handleVoiceInputState() — Routes completed audio to _processConversationRecording() when _isConversationRecording is set, otherwise falls through to existing _processRecordedAudio().
• _processConversationRecording() — New method. Transcribes audio via Whisper, wraps transcription in a prompt:

  The following is a transcription of a recorded conversation. Please:
  1. Summarize the conversation
  2. Extract potentially important notes and highlights
  3. Identify specific goals if mentioned
  4. List any action items
  
  Transcription:
  <transcribed text>
  

  Sends to AGiXT via existing _sendMessageToAGiXT(). Response streams to glasses/watch/phone speaker as usual.
• isConversationRecording getter — Exposes recording state for UI.

User-facing behavior

Action	Result
1st button press	Shows "Recording..." on glasses, mic enabled
2nd button press	Shows "Processing conversation...", transcribes + summarizes via AGiXT
Recording failure	Clean error with state reset (no fallback to 5-second mode)

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