Remove model cards, compact header, fix audio waveform overflow

Fix: remove audio height CSS, hide stray Audio label

Fix: restore audio playback controls — relax overflow/height CSS

NaijaVox unified demo: V1+V2 model switcher, green Space Grotesk UI

NaijaVox unified demo: V1+V2 model switcher, green Space Grotesk UI

NaijaVox unified demo: V1+V2 model switcher, green Space Grotesk UI

fix: resample browser mic audio 44100→16000 Hz before Whisper (librosa)

feat: initial NaijaVox-V1 demo

feat: initial NaijaVox-V1 demo

feat: initial NaijaVox-V1 demo

feat: initial NaijaVox-V1 demo

feat: initial NaijaVox-V1 demo

feat: initial NaijaVox-V1 demo

feat: initial NaijaVox-V1 demo

feat: initial NaijaVox-V1 demo

initial commit