Fix constellation: instant burst stars on click, stable background star positions
- Added one-shot 'burst' shooting stars (cBurst animation) that start at opacity:1 — no fade-in delay, fires immediately on product click
- 20 burst stars with tight 0.04s stagger feel instantaneous
- Removed shootKey from ambient shooting star keys — they loop continuously without remounting, preventing visual glitches
- Fixed cTwinkle keyframe: removed transform:scale() that caused background stars to appear to shift position on re-render
- Background stars now only animate opacity (0.3→1→0.3), positions are rock solid
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