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"@ux-team/tvu-design-system": minor
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Button: new `color="blue"` value across all three fills (`filling` / `ghost` / `rimless`) and all four sizes.

Bound to the already-shipped `--blue` / `--blue-hover` / `--blue-bg` tokens in both themes — no new tokens, no CSS rules added. Disabled state dims the default fill via opacity, matching how `red` and `orange` behave (neither has a dedicated `*-disable` token either).

Purely additive and opt-in: `blue` is never a default, so every existing Button renders byte-for-byte as before. Device-local UI (RPS One LCD `Stop Test`) already used this hue via per-file token overrides; those can now use the component axis instead.

Note for design review: the published Figma Button component-set has no blue member — this is a deliberate code-only addition under the `Code ⊇ Figma` ruling, registered in `translation/divergences-decisions.json` as `button-blue-color-axis-code-first-2026-09-02`.