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/micromark-util-decode-numeric-character-reference/dev/index.js

@@ -0,0 +1,42 @@
+import {codes, values} from 'micromark-util-symbol'
+
+/**
+ * Turn the number (in string form as either hexa- or plain decimal) coming from
+ * a numeric character reference into a character.
+ *
+ * Sort of like `String.fromCodePoint(Number.parseInt(value, base))`, but makes
+ * non-characters and control characters safe.
+ *
+ * @param {string} value
+ *   Value to decode.
+ * @param {number} base
+ *   Numeric base.
+ * @returns {string}
+ *   Character.
+ */
+export function decodeNumericCharacterReference(value, base) {
+  const code = Number.parseInt(value, base)
+
+  if (
+    // C0 except for HT, LF, FF, CR, space.
+    code < codes.ht ||
+    code === codes.vt ||
+    (code > codes.cr && code < codes.space) ||
+    // Control character (DEL) of C0, and C1 controls.
+    (code > codes.tilde && code < 160) ||
+    // Lone high surrogates and low surrogates.
+    (code > 55_295 && code < 57_344) ||
+    // Noncharacters.
+    (code > 64_975 && code < 65_008) ||
+    /* eslint-disable no-bitwise */
+    (code & 65_535) === 65_535 ||
+    (code & 65_535) === 65_534 ||
+    /* eslint-enable no-bitwise */
+    // Out of range
+    code > 1_114_111
+  ) {
+    return values.replacementCharacter
+  }
+
+  return String.fromCodePoint(code)
+}