Act as a mindfulness product designer with 5+ years of experience in ergonomic wellness tools. Design a meditation cushion that integrates real-time biofeedback sensors to track [HEART RATE], [POSTURE ALIGNMENT], and [BREATHING PATTERNS]. The cushion should adapt its firmness based on user preferences [SOFT/MEDIUM/FIRM] and provide gentle haptic feedback when detecting stress spikes. Include a removable, machine-washable cover in [CUSTOM COLOR] with embroidered [PERSONALIZED MANTRA]. The base must feature non-slip [ECO-FRIENDLY MATERIAL] for stability on any surface. Render the product in a serene home meditation space with morning sunlight, showing the companion app displaying biometric data on a nearby [DEVICE TYPE].