CacheMaintenance prunes the SwiftData caches so they don't grow forever:
seen markers >30d, read >90d, cached articles >30d, cached stories >14d —
always protecting saved bookmarks. Runs on launch. Settings gains a
"Clear offline cache" action (keeps saved) with a count + confirmation.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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