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--- a/frontend/node_modules/@lezer/html/test/mixed.txt
+++ b/frontend/node_modules/@lezer/html/test/mixed.txt
@ -0,0 +1,69 @@
+# Doesn't parse VB as JS
+
+<script type="text/visualbasic">let something = 20</script>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,Attribute(AttributeName,Is,AttributeValue),EndTag),
+  ScriptText,
+CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Does parse type-less script tags as JS
+
+<script>/foo/</script>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,EndTag),
+  Script(ExpressionStatement(RegExp)),
+CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Still doesn't end script tags on closing tags
+
+<script type=something></foo></script>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,Attribute(AttributeName,Is,UnquotedAttributeValue),EndTag),
+  ScriptText,
+CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Missing end tag
+
+<html><script>null
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,EndTag),
+  Element(OpenTag(StartTag,TagName,EndTag),
+    Script(ExpressionStatement(null)))))
+
+# JS with script type
+
+<script type="text/javascript">console.log(2)</script>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,Attribute(AttributeName,Is,AttributeValue),EndTag),
+  Script(...),
+CloseTag(StartCloseTag,TagName,EndTag)))
+
+# JS with unquoted script type
+
+<script type=module>console.log(2)</script>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,Attribute(AttributeName,Is,UnquotedAttributeValue),EndTag),
+  Script(...),
+CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Error in JS
+
+<script>a b</script>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,EndTag),
+  Script(...),
+CloseTag(StartCloseTag,TagName,EndTag)))
--- a/frontend/node_modules/@lezer/html/test/tags.txt
+++ b/frontend/node_modules/@lezer/html/test/tags.txt
@ -0,0 +1,370 @@
+# Regular tag
+
+<foo>bar</foo>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,EndTag),Text,CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Nested tag
+
+<a><b>c</b><br></a>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,EndTag),
+  Element(OpenTag(StartTag,TagName,EndTag),Text,CloseTag(StartCloseTag,TagName,EndTag)),
+  Element(SelfClosingTag(StartTag,TagName,EndTag)),
+CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Attribute
+
+<br foo="bar">
+
+==>
+
+Document(Element(SelfClosingTag(StartTag,TagName,Attribute(AttributeName,Is,AttributeValue),EndTag)))
+
+# Multiple attributes
+
+<a x="one" y="two" z="three"></a>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,
+  Attribute(AttributeName,Is,AttributeValue),
+  Attribute(AttributeName,Is,AttributeValue),
+  Attribute(AttributeName,Is,AttributeValue),EndTag),
+CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Value-less attributes
+
+<a x y="one" z></a>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,
+  Attribute(AttributeName),
+  Attribute(AttributeName,Is,AttributeValue),
+  Attribute(AttributeName),EndTag),
+CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Unquoted attributes
+
+<a x=one y z=two></a>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,
+  Attribute(AttributeName,Is,UnquotedAttributeValue),
+  Attribute(AttributeName),
+  Attribute(AttributeName,Is,UnquotedAttributeValue),EndTag),
+CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Unquoted attributes with slashes
+
+<link as=font crossorigin=anonymous href=/fonts/google-sans/regular/latin.woff2 rel=preload>
+
+==>
+
+Document(Element(SelfClosingTag(StartTag,TagName,
+  Attribute(AttributeName,Is,UnquotedAttributeValue),
+  Attribute(AttributeName,Is,UnquotedAttributeValue),
+  Attribute(AttributeName,Is,UnquotedAttributeValue),
+  Attribute(AttributeName,Is,UnquotedAttributeValue),
+EndTag)))
+
+# Single-quoted attributes
+
+<link x='one' z='two&amp;'>
+
+==>
+
+Document(Element(SelfClosingTag(StartTag, TagName,
+  Attribute(AttributeName, Is, AttributeValue),
+  Attribute(AttributeName, Is, AttributeValue(EntityReference)),
+EndTag)))
+
+# Entities
+
+<a attr="one&amp;two">&amp;&#67;</a>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,
+  Attribute(AttributeName,Is,AttributeValue(EntityReference)),EndTag),
+  EntityReference,CharacterReference,
+CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Doctype
+
+<!doctype html>
+<doc></doc>
+
+==>
+
+Document(DoctypeDecl,Text,Element(OpenTag(StartTag,TagName,EndTag),CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Processing instructions
+
+<?foo?><bar><?baz?></bar>
+
+==>
+
+Document(ProcessingInst,Element(OpenTag(StartTag,TagName,EndTag),ProcessingInst,CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Comments
+
+<!-- top comment -->
+<element><!-- inner comment --> text</element>
+<!---->
+<!--
+-->
+
+==>
+
+Document(Comment,Text,Element(OpenTag(StartTag,TagName,EndTag),Comment,Text,CloseTag(StartCloseTag,TagName,EndTag)),Text,Comment,Text,Comment)
+
+# Mismatched tag
+
+<a></b>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,EndTag),MismatchedCloseTag(StartCloseTag,TagName,EndTag)))
+
+# Unclosed tag
+
+<a>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,EndTag)))
+
+# Ignore pseudo-xml self-closers
+
+<br/>
+
+==>
+
+Document(Element(SelfClosingTag(StartTag,TagName,EndTag)))
+
+# Unclosed implicitly closed tag
+
+<p>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,EndTag)))
+
+# Nested mismatched tag
+
+<a><b><c></c></x></a>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,EndTag),
+  Element(OpenTag(StartTag,TagName,EndTag),
+    Element(OpenTag(StartTag,TagName,EndTag),CloseTag(StartCloseTag,TagName,EndTag)),
+    MismatchedCloseTag(StartCloseTag,TagName,EndTag),
+    ⚠),
+  CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Incomplete close tag
+
+<html><body></</html>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,EndTag),
+  Element(OpenTag(StartTag,TagName,EndTag), IncompleteCloseTag, ⚠),
+  CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Re-synchronize close tags
+
+<a><b><c></x></c></a>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,EndTag),
+  Element(OpenTag(StartTag,TagName,EndTag),
+    Element(OpenTag(StartTag,TagName,EndTag),
+      MismatchedCloseTag(StartCloseTag,TagName,EndTag),
+      CloseTag(StartCloseTag,TagName,EndTag)),
+    ⚠),
+  CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Top-level mismatched close tag
+
+<a></a></a>
+
+==>
+
+Document(
+  Element(OpenTag(StartTag,TagName,EndTag),CloseTag(StartCloseTag,TagName,EndTag)),
+  MismatchedCloseTag(StartCloseTag,TagName,EndTag))
+
+# Self-closing tags
+
+<a><img src=blah></a>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,EndTag),
+  Element(SelfClosingTag(StartTag,TagName,Attribute(AttributeName,Is,UnquotedAttributeValue),EndTag)),
+CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Implicitly closed
+
+<dl><dd>Hello</dl>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,EndTag),
+  Element(OpenTag(StartTag,TagName,EndTag),Text),
+CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Closed by sibling
+
+<div>
+  <p>Foo
+  <p>Bar
+</div>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,EndTag),
+  Text,
+  Element(OpenTag(StartTag,TagName,EndTag),Text),
+  Element(OpenTag(StartTag,TagName,EndTag),Text),
+CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Closed by sibling at top
+
+<p>Foo
+<p>Bar
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,EndTag),Text),Element(OpenTag(StartTag,TagName,EndTag),Text))
+
+# Textarea
+
+<p>Enter something: <textarea code-lang=javascript>function foo() {
+  return "</bar>"
+}</textarea>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,EndTag),
+  Text,
+  Element(OpenTag(StartTag,TagName,Attribute(AttributeName,Is,UnquotedAttributeValue),EndTag),
+    TextareaText,
+  CloseTag(StartCloseTag,TagName,EndTag))))
+
+# Script
+
+<script>This is not an entity: &lt;</script>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,EndTag),ScriptText,CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Doesn't get confused by a stray ampersand
+
+<html>a&b</html>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,EndTag),Text,InvalidEntity,Text,CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Can ignore mismatches {"dialect": "noMatch"}
+
+<div>foo</p>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,EndTag),Text,CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Can handle lone close tags {"dialect": "noMatch"}
+
+</strong>
+
+==>
+
+Document(CloseTag(StartCloseTag,TagName,EndTag))
+
+# Parses ampersands in attributes
+
+<img src="foo&bar">
+
+==>
+
+Document(Element(SelfClosingTag(StartTag, TagName, Attribute(AttributeName, Is, AttributeValue(InvalidEntity)), EndTag)))
+
+# Supports self-closing dialect {"dialect": "selfClosing"}
+
+<section><image id=i2 /></section>
+
+==>
+
+Document(Element(
+  OpenTag(StartTag,TagName,EndTag),
+  Element(SelfClosingTag(StartTag,TagName,Attribute(AttributeName,Is,UnquotedAttributeValue),SelfClosingEndTag)),
+  CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Allows self-closing in foreign elements
+
+<div><svg><circle/></svg></div>
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,EndTag),
+  Element(OpenTag(StartTag,TagName,EndTag),
+    Element(SelfClosingTag(StartTag,TagName,SelfClosingEndTag)),
+    CloseTag(StartCloseTag,TagName,EndTag)),
+  CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Parses multiple unfinished tags in a row
+
+<div
+<div
+<div
+
+==>
+
+Document(Element(OpenTag(StartTag,TagName,⚠),
+  Element(OpenTag(StartTag,TagName,⚠),
+    Element(OpenTag(StartTag,TagName,⚠),⚠),⚠),⚠))
+
+# Allows self-closing on special tags {"dialect": "selfClosing"}
+
+<body>
+  <br/>
+  <textarea/>
+  <script/>
+  <style/>
+</body>
+
+==>
+
+Document(Element(
+  OpenTag(StartTag,TagName,EndTag),
+  Text,
+  Element(SelfClosingTag(StartTag,TagName,SelfClosingEndTag)),
+  Text,
+  Element(SelfClosingTag(StartTag,TagName,SelfClosingEndTag)),
+  Text,
+  Element(SelfClosingTag(StartTag,TagName,SelfClosingEndTag)),
+  Text,
+  Element(SelfClosingTag(StartTag,TagName,SelfClosingEndTag)),
+  Text,
+  CloseTag(StartCloseTag,TagName,EndTag)))
+
+# Only treats less-than as opening a tag when followed by a name
+
+< div>x
+
+==>
+
+Document(IncompleteTag,Text)
--- a/frontend/node_modules/@lezer/html/test/test-html.js
+++ b/frontend/node_modules/@lezer/html/test/test-html.js
@ -0,0 +1,29 @@
+import {parser, configureNesting} from "../dist/index.js"
+import {parser as jsParser} from "@lezer/javascript"
+import {fileTests} from "@lezer/generator/dist/test"
+
+import * as fs from "fs"
+import * as path from "path"
+import {fileURLToPath} from "url"
+let caseDir = path.dirname(fileURLToPath(import.meta.url))
+
+let mixed = parser.configure({
+  wrap: configureNesting([{
+    tag: "script",
+    attrs(attrs) {
+      return !attrs.type || /^(?:text|application)\/(?:x-)?(?:java|ecma)script$|^module$|^$/i.test(attrs.type)
+    },
+    parser: jsParser
+  }])
+})
+
+for (let file of fs.readdirSync(caseDir)) {
+  if (!/\.txt$/.test(file)) continue
+  let name = /^[^\.]*/.exec(file)[0]
+  describe(name, () => {
+    let p = name == "mixed" ? mixed : parser
+    for (let {name, run} of fileTests(fs.readFileSync(path.join(caseDir, file), "utf8"), file))
+      it(name, () => run(p))
+  })
+}
+
--- a/frontend/node_modules/@lezer/html/test/test-incremental.js
+++ b/frontend/node_modules/@lezer/html/test/test-incremental.js
@ -0,0 +1,97 @@
+import {parser as baseParser} from "../dist/index.js"
+import {TreeFragment} from "@lezer/common"
+
+let parser = baseParser.configure({bufferLength: 2})
+
+let r = n => Math.floor(Math.random() * n)
+
+let tags = ["p", "ul", "li", "div", "span", "th", "tr", "body", "head", "title", "dd", "code", "em", "strong"]
+
+function randomDoc(size) {
+  let doc = ""
+  if (!r(5)) doc += "<!doctype html>"
+  let scope = []
+  for (let i = 0; i < size; i++) {
+    let sel = r(20)
+    if (sel < 5) {
+      let tag = tags[r(tags.length)]
+      doc += `<${tag}${r(2) ? " a=b" : ""}>`
+      scope.push(tag)
+    } else if (sel < 10 && scope.length) {
+      let name = scope.pop()
+      doc += `</${r(5) ? name : "div"}>`
+    } else if (sel == 10) {
+      doc += `<img>`
+    } else if (sel == 11) {
+      doc += "<script>a()</script>"
+    } else if (sel == 12) {
+      doc += r(2) ? "&amp;" : "<!--@-->"
+    } else {
+      for (let i = r(6) + 1; i >= 0; i--)
+        doc += String.fromCharCode(97 + r(26))
+    }
+  }
+  while (scope.length) {
+    let name = scope.pop()
+    if (r(5)) doc += `</${name}>`
+  }
+  return doc
+}
+
+function check(doc, [tp, pos, txt], prevAST) {
+  let change = {fromA: pos, toA: pos, fromB: pos, toB: pos}, newDoc
+  if (tp == "insert") {
+    newDoc = doc.slice(0, pos) + txt + doc.slice(pos)
+    change.toA += txt.length
+  } else if (tp == "del") {
+    newDoc = doc.slice(0, pos) + doc.slice(pos + 1)
+    change.toB++
+  } else {
+    newDoc = doc.slice(0, pos) + txt + doc.slice(pos + 1)
+    change.toA += txt.length
+    change.toB++
+  }
+  let fragments = TreeFragment.applyChanges(TreeFragment.addTree(prevAST || parser.parse(doc)), [change], 2)
+  let ast = parser.parse(newDoc, fragments)
+  let orig = parser.parse(newDoc)
+  if (ast.toString() != orig.toString()) {
+    throw new Error(`Mismatch:\n  ${ast}\nvs\n  ${orig}\ndocument: ${
+      JSON.stringify(doc)}\naction: ${JSON.stringify([tp, pos, ch])}`)
+  }
+  return [newDoc, ast]
+}
+
+// Call this to just run random tests until a failing one is found.
+// Not directly called in the tests because there's a bunch of
+// circumstances in which uninteresting deviations in error recovery
+// will create differing parses, so results have to be manually
+// inspected.
+function generate() {
+  for (let count = 0, size = 2;; size = Math.min(40, size + 1)) {
+    let doc = randomDoc(size), prev = null
+    for (let i = 0; i < 2; i++) {
+      console.log("Attempt", ++count)
+      let action = [["del", "insert", "replace"][r(3)], r(doc.length - 1), "<>/piabc "[r(9)]]
+      ;([doc, prev] = check(doc, action, prev))
+    }
+  }
+}
+
+describe("Incremental parsing", () => {
+  it("doesn't get confused by reused opening tags", () => {
+    check("<code><code>mgnbni</code></code>", ["del", 29])
+  })
+
+  it("can handle a renamed opening tag after a self-closing", () => {
+    check("<p>one two three four five six seven<p>eight", ["replace", 37, "a"])
+  })
+
+  it("is okay with nameless elements", () => {
+    check("<body><code><img></code><>body>", ["replace", 14, ">"])
+    check("abcde<>fghij<", ["replace", 12, ">"])
+  })
+
+  it("doesn't get confused by an invalid close tag receiving a matching open tag", () => {
+    check("<div><p>foo</body>", ["insert", 0, "<body>"])
+  })
+})
--- a/frontend/node_modules/@lezer/html/test/vue.txt
+++ b/frontend/node_modules/@lezer/html/test/vue.txt
@ -0,0 +1,56 @@
+# Parses Vue builtin directives
+
+<span v-text="msg"></span>
+
+==>
+
+Document(
+  Element(
+    OpenTag(StartTag, TagName, Attribute(AttributeName, Is, AttributeValue), EndTag),
+    CloseTag(StartCloseTag, TagName, EndTag)))
+
+# Parses Vue :is shorthand syntax
+
+<Component :is="view"></Component>
+
+==>
+
+Document(
+  Element(
+    OpenTag(StartTag, TagName, Attribute(AttributeName, Is, AttributeValue),EndTag),
+    CloseTag(StartCloseTag, TagName, EndTag)))
+
+# Parses Vue @click shorthand syntax
+
+<button @click="handler()">Click me</button>
+
+==>
+
+Document(
+  Element(
+    OpenTag(StartTag, TagName, Attribute(AttributeName, Is, AttributeValue), EndTag),
+    Text,
+    CloseTag(StartCloseTag, TagName, EndTag)))
+
+# Parses Vue @submit.prevent shorthand syntax
+
+<form @submit.prevent="onSubmit"></form>
+
+==>
+
+Document(
+  Element(
+    OpenTag(StartTag, TagName, Attribute(AttributeName, Is, AttributeValue), EndTag),
+    CloseTag(StartCloseTag, TagName, EndTag)))
+
+# Parses Vue Dynamic Arguments
+
+<a v-bind:[attributeName]="url">Link</a>
+
+==>
+
+Document(
+  Element(
+    OpenTag(StartTag, TagName, Attribute(AttributeName, Is, AttributeValue), EndTag),
+    Text,
+    CloseTag(StartCloseTag, TagName, EndTag)))