Bug: when action tab (value=3) was tapped, selectedTab was already 3
by the time handleActionTap ran. The check 'if selectedTab == 2'
always failed, falling through to food assistant.
Fix: use onChange(of: selectedTab) oldValue to capture which tab the
user was on BEFORE tapping the action button. Pass that to
handleActionTap(from:). If from Reader (2), toggle auto-scroll.
If from Home/Fitness, open food assistant.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
395cca08dd