feat(render): open a fetched view folded to the issue headings

The header set #+STARTUP: show3levels, which opened a fresh view with each issue's Comments heading already unfolded. That's a level of detail past what you want when scanning a list. Drop to show2levels so a view opens at the parent plus the issue headings, with comments and bodies folded under each issue.

pearl--restore-page-visibility re-reads #+STARTUP from the buffer after a repopulation, so the in-place rebuild path follows the new depth without any other change.

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