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/thematic-break.js

@@ -0,0 +1,102 @@
+/**
+ * @import {
+ *   Code,
+ *   Construct,
+ *   State,
+ *   TokenizeContext,
+ *   Tokenizer
+ * } from 'micromark-util-types'
+ */
+
+import { factorySpace } from 'micromark-factory-space';
+import { markdownLineEnding, markdownSpace } from 'micromark-util-character';
+/** @type {Construct} */
+export const thematicBreak = {
+  name: 'thematicBreak',
+  tokenize: tokenizeThematicBreak
+};
+
+/**
+ * @this {TokenizeContext}
+ *   Context.
+ * @type {Tokenizer}
+ */
+function tokenizeThematicBreak(effects, ok, nok) {
+  let size = 0;
+  /** @type {NonNullable<Code>} */
+  let marker;
+  return start;
+
+  /**
+   * Start of thematic break.
+   *
+   * ```markdown
+   * > | ***
+   *     ^
+   * ```
+   *
+   * @type {State}
+   */
+  function start(code) {
+    effects.enter("thematicBreak");
+    // To do: parse indent like `markdown-rs`.
+    return before(code);
+  }
+
+  /**
+   * After optional whitespace, at marker.
+   *
+   * ```markdown
+   * > | ***
+   *     ^
+   * ```
+   *
+   * @type {State}
+   */
+  function before(code) {
+    marker = code;
+    return atBreak(code);
+  }
+
+  /**
+   * After something, before something else.
+   *
+   * ```markdown
+   * > | ***
+   *     ^
+   * ```
+   *
+   * @type {State}
+   */
+  function atBreak(code) {
+    if (code === marker) {
+      effects.enter("thematicBreakSequence");
+      return sequence(code);
+    }
+    if (size >= 3 && (code === null || markdownLineEnding(code))) {
+      effects.exit("thematicBreak");
+      return ok(code);
+    }
+    return nok(code);
+  }
+
+  /**
+   * In sequence.
+   *
+   * ```markdown
+   * > | ***
+   *     ^
+   * ```
+   *
+   * @type {State}
+   */
+  function sequence(code) {
+    if (code === marker) {
+      effects.consume(code);
+      size++;
+      return sequence;
+    }
+    effects.exit("thematicBreakSequence");
+    return markdownSpace(code) ? factorySpace(effects, atBreak, "whitespace")(code) : atBreak(code);
+  }
+}