feat(theme-studio): warn on too-similar palette colors by ΔE

Perceptual-metrics Phase 3. renderPalette now runs a pairwise OKLab ΔE over the palette and warns on any pair below the named DELTAE_MIN threshold (0.02). The warning lists the closest pairs first, caps at five, and appends "and N more" so a noisy palette never hides the count. Each chip's tooltip gains its nearest-neighbor ΔE.

paletteDeltas computes the pairs and the per-color nearest distance in one pass, feeding both the chip titles and the warning list. Palette names go through esc before they reach the warning markup. A #deltatest headless guard asserts a near-identical pair fires and names itself, a spread palette stays quiet, and a tight cluster caps at five in ascending order with the overflow suffix.

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