Extract duplicated animation infrastructure (clock, mixer, animation
caching, raycaster, keyframe interpolation) from ActorRenderer and
PlantRenderer into a new AnimatedRenderer intermediate class. Extract
identical sound player code from both editors into createSoundPlayer()
utility. Fix PlantRenderer interpolateVertex bug where scale keys had
X incorrectly negated. Remove dead PLANT_ANIM_IDS export and redundant
textures.clear() calls.
Add Plants tab to the save editor for browsing and editing all 81 plants.
Click-to-customize based on selected character matches the original game
behavior (Pepper→variant, Mama→sound, Papa→move, Nick→color, Laura→mood).
Includes 3D preview with per-variant display tuning, click animations,
sound playback, and reset to defaults.
