Add night/day cycle with 4 time phases

- Added time cycle system with dawn, day, dusk, and night phases
- Each phase has unique gradient backgrounds and ambient orb colors
- Voidlings move faster during day/dawn/dusk, slower at night
- Voidlings naturally become sleepy when night falls
- Added auto-cycle that progresses every ~15 seconds per phase
- Added manual time control toggle for user preference
- Added progress bar showing time until next phase
- Time controls display current time icon and name

WORKLOG.md

@@ -37,13 +37,18 @@ A whimsical pocket dimension where digital companions called "Voidlings" float a
 - Added petting interaction (♡ button) - makes voidlings happy
 - Added achievements system with 10 unlockable achievements
 - Added user stats tracking (total pets, feedings, sessions)
+- Added night/day cycle with 4 time phases (dawn, day, dusk, night)
+- Added time-based visual themes with different gradients and ambient colors
+- Added automatic time progression (1 minute per full cycle)
+- Added manual time control toggle
+- Added voidling speed multipliers based on time of day (slower at night)
+- Voidlings naturally become sleepy at night
 
 ### Next Steps
 1. Add sound effects
 2. Add voidling shop/trading
-3. Add night/day cycle
-4. Add more voidling types
-5. Add voidling minigames
+3. Add more voidling types
+4. Add voidling minigames
 
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