feat(e2e): add headless pipeline validation tests #1022

Job	Run time
E2E / Pipeline Validation	3m 24s
E2E / Pipeline Validation (GPU)	2m 7s
E2E / Playwright E2E	3m 25s
UI / Build	12s
UI / Knip (unused code)	15s
UI / Lint (TypeScript + ESLint)	43s
Skit / Build	3m 23s
UI / Test	26s
Skit / Test (GPU)	1m 3s
Skit / Lint (fmt + clippy)	3m 24s
Plugins / Format Check	15s
Plugins / Lint (NLLB)	2m 13s
Skit / Test	3m 24s
Plugins / Lint (Whisper)	44s
Plugins / Lint (Simple Plugins)	54s
Plugins / Lint (Sherpa-ONNX Plugins)	1m 4s
All Checks Passed	1s
	26m 57s

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