feat: add signal stats panel for selection region

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Display Duration, Energy, Peak amplitude, RMS amplitude, and PAPR for
the current time/frequency selection. The stats box:
- Appears next to the selection box (right side, or left if not enough room)
- Centers vertically on the selection box
- Uses a semi-transparent dark background with yellow border
- Updates live while dragging the selection
- Computed in utils.c with ComputeSignalStats()

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Tyler

2026-05-24 22:49:44 -07:00

parent 0c64202670

commit cc58965acc

8 changed files with 241 additions and 8 deletions

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spectrogram_full.png

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