Server: add slim query param (default true) to entries list endpoint,
returning EntrySlimOut without content/full_content HTML — cuts payload
size dramatically for list views. Single entry endpoint still returns
full content.
iOS: ArticleView now fetches full entry content on demand when opened
instead of relying on list data. Shows loading indicator while fetching.
Mark-as-read is fire-and-forget to avoid blocking the view.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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