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/mdast-util-to-markdown/lib/handle/image.js

@@ -0,0 +1,82 @@
+/**
+ * @import {Info, State} from 'mdast-util-to-markdown'
+ * @import {Image, Parents} from 'mdast'
+ */
+
+import {checkQuote} from '../util/check-quote.js'
+
+image.peek = imagePeek
+
+/**
+ * @param {Image} node
+ * @param {Parents | undefined} _
+ * @param {State} state
+ * @param {Info} info
+ * @returns {string}
+ */
+export function image(node, _, state, info) {
+  const quote = checkQuote(state)
+  const suffix = quote === '"' ? 'Quote' : 'Apostrophe'
+  const exit = state.enter('image')
+  let subexit = state.enter('label')
+  const tracker = state.createTracker(info)
+  let value = tracker.move('![')
+  value += tracker.move(
+    state.safe(node.alt, {before: value, after: ']', ...tracker.current()})
+  )
+  value += tracker.move('](')
+
+  subexit()
+
+  if (
+    // If there’s no url but there is a title…
+    (!node.url && node.title) ||
+    // If there are control characters or whitespace.
+    /[\0- \u007F]/.test(node.url)
+  ) {
+    subexit = state.enter('destinationLiteral')
+    value += tracker.move('<')
+    value += tracker.move(
+      state.safe(node.url, {before: value, after: '>', ...tracker.current()})
+    )
+    value += tracker.move('>')
+  } else {
+    // No whitespace, raw is prettier.
+    subexit = state.enter('destinationRaw')
+    value += tracker.move(
+      state.safe(node.url, {
+        before: value,
+        after: node.title ? ' ' : ')',
+        ...tracker.current()
+      })
+    )
+  }
+
+  subexit()
+
+  if (node.title) {
+    subexit = state.enter(`title${suffix}`)
+    value += tracker.move(' ' + quote)
+    value += tracker.move(
+      state.safe(node.title, {
+        before: value,
+        after: quote,
+        ...tracker.current()
+      })
+    )
+    value += tracker.move(quote)
+    subexit()
+  }
+
+  value += tracker.move(')')
+  exit()
+
+  return value
+}
+
+/**
+ * @returns {string}
+ */
+function imagePeek() {
+  return '!'
+}