feat: initialize markr nostr bookmark client

- Add project structure with TypeScript, React, and Vite
- Implement nostr authentication using browser extension (NIP-07)
- Add NIP-51 compliant bookmark fetching and display
- Create minimal UI with login and bookmark components
- Integrate applesauce-core and applesauce-react libraries
- Add responsive styling with dark/light mode support
- Include comprehensive README with setup instructions

This is a minimal MVP for a nostr bookmark client that allows users to
view their bookmarks according to NIP-51 specification.

node_modules/fs.realpath/index.js

@@ -0,0 +1,66 @@
+module.exports = realpath
+realpath.realpath = realpath
+realpath.sync = realpathSync
+realpath.realpathSync = realpathSync
+realpath.monkeypatch = monkeypatch
+realpath.unmonkeypatch = unmonkeypatch
+
+var fs = require('fs')
+var origRealpath = fs.realpath
+var origRealpathSync = fs.realpathSync
+
+var version = process.version
+var ok = /^v[0-5]\./.test(version)
+var old = require('./old.js')
+
+function newError (er) {
+  return er && er.syscall === 'realpath' && (
+    er.code === 'ELOOP' ||
+    er.code === 'ENOMEM' ||
+    er.code === 'ENAMETOOLONG'
+  )
+}
+
+function realpath (p, cache, cb) {
+  if (ok) {
+    return origRealpath(p, cache, cb)
+  }
+
+  if (typeof cache === 'function') {
+    cb = cache
+    cache = null
+  }
+  origRealpath(p, cache, function (er, result) {
+    if (newError(er)) {
+      old.realpath(p, cache, cb)
+    } else {
+      cb(er, result)
+    }
+  })
+}
+
+function realpathSync (p, cache) {
+  if (ok) {
+    return origRealpathSync(p, cache)
+  }
+
+  try {
+    return origRealpathSync(p, cache)
+  } catch (er) {
+    if (newError(er)) {
+      return old.realpathSync(p, cache)
+    } else {
+      throw er
+    }
+  }
+}
+
+function monkeypatch () {
+  fs.realpath = realpath
+  fs.realpathSync = realpathSync
+}
+
+function unmonkeypatch () {
+  fs.realpath = origRealpath
+  fs.realpathSync = origRealpathSync
+}