- ReaderViewModel starts with isLoading=true (shows spinner, not "No articles")
- MainTabView owns ReaderViewModel and pre-fetches in background on launch
- Sub-tabs and feed chips hidden during initial load (no tiny squished layout)
- VStack fills full screen with frame(maxWidth/maxHeight: .infinity)
- WebKit warmer triggers when Reader tab appears
- By the time user taps Reader, data is already loaded
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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