chore: release core 0.8.0

[github-actions]

🤖 I have created a release beep boop

0.8.0 (2026-03-27)

Features

• core: add component registry and framework templates (#43) (0522574)
• core: add touch & mobile utilities (ce4ed1a)
• core: enhance dark-aware component with theming (#47) (bc8e5f5)
• core: refine CSS functions for perceptual uniformity (#48) (d7ecb2a)
• docs: add showcase pages demonstrating Shift CSS features (#49) (cf5285d)

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