feat: supertonic tts plugin (#45) #176

Job	Run time
Plugins / Format Check	18s
UI / Build	25s
UI / Lint (TypeScript + ESLint)	33s
Skit / Test	8m 33s
Skit / Lint (fmt + clippy)	5m 16s
Plugins / Lint (NLLB)	2m 24s
UI / Test	18s
Plugins / Lint (Whisper)	37s
E2E / Playwright E2E	4m 57s
Plugins / Lint (Simple Plugins)	35s
Skit / Build	13m 6s
Plugins / Lint (Sherpa-ONNX Plugins)	44s
All Checks Passed	4s
	37m 50s

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