Add live waveform and active status pill to dictation panel

[jrschumacher]

Summary

• add a live waveform visualizer for active dictation
• add an optional floating icon setting that expands recording/transcribing into a pill with text
• resize the dictation panel for the active pill state and wire the setting through the app store

Notes

• the ESLint run still reports an existing unrelated warning in SettingsPage about a missing useEffect dependency