perf: Switch Whisper to tiny.en (10x faster), increase proxy+uvicorn timeouts to 120s for CPU inference

feat: Context-aware journal prompts, sleep correlation tracker, and dark/light mode toggle

feat: Weekly Report — Spotify Wrapped-style emotional summary with mood arc, AI narrative, emotion breakdown, and one-click image export

InnerVoice Production Upgrade: Multi-channel chat, premium UI components, Whisper-small accuracy upgrade, and full-screen layout polishing

feat: implement JWT auth and voice calibration onboarding

Initial commit: InnerVoice MVP