feat(safari): iframe for injected script

[collectedmind]

Goal

Inject iFrame into the page to use as a staging area for UI

Acceptance Criteria:

• [ ] Inject iframe on script injection
• [ ] Update create dispatch to adjust frame height for content
• [ ] Populate iFrame with appropriate listeners

Implementation Decisions

We do this to avoid collision. This may not be entirely necessary given the context the safari scripts run in, but it will isolate css which has traditionally encountered edge cases with collisions.

[collectedmind]

This feels like it is out of scope given our timelines. The context in which things runs make injected scripts unable to access to the safari API. There is talk this will be fixed in future versions, but until we are certain users won't be affected, I would rather deal with occasional style collisions.