Important

Fixes settings saving logic in CodeIndexManager to ensure saved settings are applied and used, with added tests for configuration change handling.

• Behavior:
  • Updates webviewMessageHandler to ensure CodeIndexManager uses saved settings and starts indexing if configured and enabled.
  • Adds logic to CodeIndexConfigManager to detect configuration changes that require a restart, including provider and model changes.
  • Ensures CodeIndexManager restarts services if configuration changes require it.
• Tests:
  • Adds tests in config-manager.test.ts to verify restart detection logic for various configuration changes.
  • Adds tests in manager.test.ts to ensure handleExternalSettingsChange works correctly when manager is uninitialized or initialized.
  • Adds tests in service-factory.test.ts to verify embedder and vector store creation logic.
• UI:
  • Updates CodeIndexSettings.tsx to handle provider and model selection changes, ensuring correct model ID is used for the selected provider.

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