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-symbol/lib/constants.js

@@ -0,0 +1,44 @@
+/**
+ * This module is compiled away!
+ *
+ * Parsing markdown comes with a couple of constants, such as minimum or maximum
+ * sizes of certain sequences.
+ * Additionally, there are a couple symbols used inside micromark.
+ * These are all defined here, but compiled away by scripts.
+ */
+export const constants = /** @type {const} */ ({
+  attentionSideAfter: 2, // Symbol to mark an attention sequence as after content: `a*`
+  attentionSideBefore: 1, // Symbol to mark an attention sequence as before content: `*a`
+  atxHeadingOpeningFenceSizeMax: 6, // 6 number signs is fine, 7 isn’t.
+  autolinkDomainSizeMax: 63, // 63 characters is fine, 64 is too many.
+  autolinkSchemeSizeMax: 32, // 32 characters is fine, 33 is too many.
+  cdataOpeningString: 'CDATA[', // And preceded by `<![`.
+  characterGroupPunctuation: 2, // Symbol used to indicate a character is punctuation
+  characterGroupWhitespace: 1, // Symbol used to indicate a character is whitespace
+  characterReferenceDecimalSizeMax: 7, // `&#9999999;`.
+  characterReferenceHexadecimalSizeMax: 6, // `&#xff9999;`.
+  characterReferenceNamedSizeMax: 31, // `&CounterClockwiseContourIntegral;`.
+  codeFencedSequenceSizeMin: 3, // At least 3 ticks or tildes are needed.
+  contentTypeContent: 'content',
+  contentTypeDocument: 'document',
+  contentTypeFlow: 'flow',
+  contentTypeString: 'string',
+  contentTypeText: 'text',
+  hardBreakPrefixSizeMin: 2, // At least 2 trailing spaces are needed.
+  htmlBasic: 6, // Symbol for `<div`
+  htmlCdata: 5, // Symbol for `<![CDATA[]]>`
+  htmlComment: 2, // Symbol for `<!---->`
+  htmlComplete: 7, // Symbol for `<x>`
+  htmlDeclaration: 4, // Symbol for `<!doctype>`
+  htmlInstruction: 3, // Symbol for `<?php?>`
+  htmlRawSizeMax: 8, // Length of `textarea`.
+  htmlRaw: 1, // Symbol for `<script>`
+  linkResourceDestinationBalanceMax: 32, // See: <https://spec.commonmark.org/0.30/#link-destination>, <https://github.com/remarkjs/react-markdown/issues/658#issuecomment-984345577>
+  linkReferenceSizeMax: 999, // See: <https://spec.commonmark.org/0.30/#link-label>
+  listItemValueSizeMax: 10, // See: <https://spec.commonmark.org/0.30/#ordered-list-marker>
+  numericBaseDecimal: 10,
+  numericBaseHexadecimal: 0x10,
+  tabSize: 4, // Tabs have a hard-coded size of 4, per CommonMark.
+  thematicBreakMarkerCountMin: 3, // At least 3 asterisks, dashes, or underscores are needed.
+  v8MaxSafeChunkSize: 10_000 // V8 (and potentially others) have problems injecting giant arrays into other arrays, hence we operate in chunks.
+})