feat(viewer): reviewer-grade trajectory pages, multi-run browsing, and hf:// dataset sources - #1034

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683, astral-sh/setup-uv@caf0cab7a618c569241d31dcd442f54681755d39. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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