Add diagonal view-transition wipe between pages

Hooks SvelteKit's onNavigate into the View Transitions API and styles the
old/new root pseudos with a scaled fade-out and a clip-path diagonal reveal
trimmed by a green drop-shadow accent. Honors prefers-reduced-motion.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

package-lock.json

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-      "license": "MIT"
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       "license": "ISC",
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