Graceful handling of note loading failure

[oo-bldrs]

If the application fails to load comments or notes, it will display a spinner in the sidebar that never stops.

This PR addresses that scenario by introducing logic to:

• render an application error component that gives the user the option to "restart"
• dispatches the error to the Sentry subsystem (which will forward it along, if it's configured in that given environment).

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