fix(interactions): resolve ephemeral channels from cache

[ooliver1]

Summary

fixes #12
get the channel from cache if it exists, else assume it is a DM like before
guild is used if it is found in the channel

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
  • I have run task pyright and fixed the relevant issues.
• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)

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