• Tooltip peak dB: Now shows peak dB (max over last ~1 second) in the tooltip while hovering over spectrum/waterfall, updated every second
• Waterfall/Spectrum peak track: Peaks are always tracked internally even when display is off - tooltip peak uses separate buffer
• Fixed dev script: Uses concurrently --raw for clean process management on Windows (Ctrl+C kills all processes)
• Dev script wait: Uses concurrently instead of start-server-and-test for more reliable cross-platform dev experience
• Version bump: v0.9.3 → v0.9.4