fix(tui): validate spinner.characters (≥2) and frameInterval (>0); add first tests #12088
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Implements two small TODOs in packages/tui/src/index.ts:
spinner.charactersto be an array with ≥2 entries.frameIntervalto be a number > 0.Adds the first tests for the TUI package in
packages/tui/src/index.test.ts(valid + invalid cases). No behavior changes for valid inputs.