Root cause: _setNavBarColor used _lastNavColor (a module-level cache)
to skip wx.setNavigationBarColor when the color appeared unchanged.
But wx.setNavigationBarColor is per-page — each tab page has its own
navigation bar and needs an explicit call. The cache prevented
subsequent pages from ever receiving the call.
Example trace:
index onShow → _setNavBarColor(#FF6B35) → _lastNavColor=#FF6B35 ✓
settings onShow → _setNavBarColor(#FF6B35) → cache hit, return ✗
User picks green → setTheme → _setNavBarColor(#43A047) ✓
index onShow → _setNavBarColor(#43A047) → cache hit, return ✗
→ Index still shows orange!
Fix: remove _lastNavColor guard entirely. Keep setTimeout debounce.
lc
a5c591eaf3