feat: add Nostr Atlas directory site

[alokdangre]

Summary

Adds Nostr Atlas, a standalone directory website inspired by the search-first experience of nostr.directory.

The new site is isolated under directory-site/, so it does not change the existing component-library or relay-directory backend build paths.

What was added

• Responsive desktop and mobile directory interface
• Search by name, handle, NIP-05 address, category, or npub
• Trending, Creators, Builders, and Communities tabs
• Verified-only filter
• Sorting by follower count or name
• Copy-npub action with clipboard fallback and user feedback
• External profile links
• Mobile navigation
• Accessible keyboard and focus states
• Local add-profile preview flow
• Empty-search state and clear-filter action
• Reduced-motion support
• Unit tests for filtering, searching, sorting, and formatting

Data integration

The current profiles are clearly presented as local sample data.

The frontend is structured so directory-site/src/data.ts can later be replaced with data from the existing Firestore relay-directory projection once a public read API is available.

New commands

npm run dev:directory
npm run build:directory
npm run preview:directory

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 1b96b34c-2b11-47a2-99e6-122550843ee4

📥 Commits

Reviewing files that changed from the base of the PR and between 61d4ba7 and 7746268.

📒 Files selected for processing (10)

• directory-site/README.md
• directory-site/index.html
• directory-site/src/data.ts
• directory-site/src/directory.test.ts
• directory-site/src/directory.ts
• directory-site/src/icons.ts
• directory-site/src/main.ts
• directory-site/src/styles.css
• directory-site/vite.config.ts
• package.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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