Fix TypeScript compilation error from invalid @google/genai import

[Copilot]

TypeScript compilation was failing due to importing a non-existent ConnectCallbacks type from @google/genai.

Changes

• services/geminiService.ts: Removed unused ConnectCallbacks import
  • The code defines its own LiveConnectionCallbacks interface and never references the imported type
  • LiveServerMessage and Blob types remain imported as they are actively used

- import type { LiveServerMessage, Blob, ConnectCallbacks } from '@google/genai';
+ import type { LiveServerMessage, Blob } from '@google/genai';

Original prompt

get this working correctly

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