feat(hello): use path-based profile URLs for modal deep links

[ronggur]

Summary

• Replace hash-based profile deep links (/hello/#scott) with shareable path URLs (/hello/scott) while keeping the popup UX on a single /hello page
• Add server rewrites in server.mjs (production) and src/middleware.ts (dev) so direct visits to /hello/:slug render the same /hello SSR page without a new Astro route per profile
• Update client-side History API in HelloModal and HelloPeople for open/close/back navigation, legacy hash migration, and invalid slug handling

How it works

• Click card: pushState → /hello/scott, modal opens (no server request)
• Close modal: URL normalizes back to /hello
• Browser back: popstate closes the modal
• Direct link: /hello/scott loads /hello via rewrite, client opens modal from pathname
• Legacy links: /hello/#scott migrates once to /hello/scott

Test plan

• Visit /hello, click a profile card → URL becomes /hello/:slug, modal opens
• Close modal (X, backdrop, Escape) → URL returns to /hello
• Open modal, press browser back → modal closes, URL is /hello
• Direct visit /hello/:slug → page loads, modal auto-opens
• Direct visit /hello/invalid-slug → grid visible, no modal, URL normalized to /hello
• Visit /hello/#:slug → client migrates to /hello/:slug, modal opens

[github-actions]

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