fix(frontend): add SPA rewrites so client routes deploy on Vercel - #565

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Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Unexpected input(s) 'targets', valid inputs are ['toolchain', 'target', 'components', 'cache', 'cache-workspaces', 'cache-directories', 'cache-on-failure', 'cache-key', 'cache-shared-key', 'cache-bin', 'cache-provider', 'cache-all-crates', 'cache-workspace-crates', 'cache-save-if', 'cache-targets', 'matcher', 'rustflags', 'override', 'rust-src-dir']