Render log context in Front error comments

[edalzell]

LogHandler reads only context.exception from the log record and drops the rest of the context, so anything an app attaches for triage never reaches the Front conversation. A handler that reports Log::error('Redis unavailable', ['uptime_in_seconds' => 12]) gets a comment with the message and stack trace only, and the context has to be dug out of laravel.log on the server instead.

Laravel's exception handler merges exceptionContext() (plus userId) into that same context array, so this affects every site using the front log channel, not just explicit Log:: calls.

The exception path now renders the remaining context keys as bullets between the file/line and the stack trace — * redis: {"loading":1,"uptime_in_seconds":12} — with exception excluded since it is already rendered as the message and trace. Strings print as-is, everything else is JSON encoded.