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-core-commonmark/lib/label-start-image.js

@@ -0,0 +1,102 @@
+/**
+ * @import {
+ *   Construct,
+ *   State,
+ *   TokenizeContext,
+ *   Tokenizer
+ * } from 'micromark-util-types'
+ */
+
+import { labelEnd } from './label-end.js';
+
+/** @type {Construct} */
+export const labelStartImage = {
+  name: 'labelStartImage',
+  resolveAll: labelEnd.resolveAll,
+  tokenize: tokenizeLabelStartImage
+};
+
+/**
+ * @this {TokenizeContext}
+ *   Context.
+ * @type {Tokenizer}
+ */
+function tokenizeLabelStartImage(effects, ok, nok) {
+  const self = this;
+  return start;
+
+  /**
+   * Start of label (image) start.
+   *
+   * ```markdown
+   * > | a ![b] c
+   *       ^
+   * ```
+   *
+   * @type {State}
+   */
+  function start(code) {
+    effects.enter("labelImage");
+    effects.enter("labelImageMarker");
+    effects.consume(code);
+    effects.exit("labelImageMarker");
+    return open;
+  }
+
+  /**
+   * After `!`, at `[`.
+   *
+   * ```markdown
+   * > | a ![b] c
+   *        ^
+   * ```
+   *
+   * @type {State}
+   */
+  function open(code) {
+    if (code === 91) {
+      effects.enter("labelMarker");
+      effects.consume(code);
+      effects.exit("labelMarker");
+      effects.exit("labelImage");
+      return after;
+    }
+    return nok(code);
+  }
+
+  /**
+   * After `![`.
+   *
+   * ```markdown
+   * > | a ![b] c
+   *         ^
+   * ```
+   *
+   * This is needed in because, when GFM footnotes are enabled, images never
+   * form when started with a `^`.
+   * Instead, links form:
+   *
+   * ```markdown
+   * ![^a](b)
+   *
+   * ![^a][b]
+   *
+   * [b]: c
+   * ```
+   *
+   * ```html
+   * <p>!<a href=\"b\">^a</a></p>
+   * <p>!<a href=\"c\">^a</a></p>
+   * ```
+   *
+   * @type {State}
+   */
+  function after(code) {
+    // To do: use a new field to do this, this is still needed for
+    // `micromark-extension-gfm-footnote`, but the `label-start-link`
+    // behavior isn’t.
+    // Hidden footnotes hook.
+    /* c8 ignore next 3 */
+    return code === 94 && '_hiddenFootnoteSupport' in self.parser.constructs ? nok(code) : ok(code);
+  }
+}