Add Array.isArray check before .join()

[opencode-agent]

Both changes are applied. The fix adds defensive type checking in the format function to handle cases where the answer might be a string instead of an array. This can happen when loading older sessions or if data gets stored in an unexpected format.

Summary of the fix:

The bug occurred because props.metadata.answers?.[i()] could sometimes be a string instead of an array (string[]), causing answer.join(", ") to fail since strings don't have a join method.

The fix adds a type check before calling .join():

1. If answer is falsy or empty, return the fallback text
2. If answer is not an array, convert it to a string with String(answer)
3. Otherwise, call .join(", ") as before

This makes the code resilient to data type variations that might occur when loading historical sessions.

Closes #7392

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