diff --git a/docs/hosting.md b/docs/hosting.md
index 4bbaeb593..013027533 100644
--- a/docs/hosting.md
+++ b/docs/hosting.md
@@ -61,6 +61,7 @@ jobs:
         with:
           fetch-depth: 0 # Fetch all history for git info
       - uses: actions/setup-node@v4
+        node-version: 22
       - name: Install Dependencies
         run: npm ci
       - name: Build Quartz
diff --git a/docs/plugins/Latex.md b/docs/plugins/Latex.md
index ac4367841..236cbeca4 100644
--- a/docs/plugins/Latex.md
+++ b/docs/plugins/Latex.md
@@ -12,6 +12,7 @@ This plugin adds LaTeX support to Quartz. See [[features/Latex|Latex]] for more
 This plugin accepts the following configuration options:
 
 - `renderEngine`: the engine to use to render LaTeX equations. Can be `"katex"` for [KaTeX](https://katex.org/) or `"mathjax"` for [MathJax](https://www.mathjax.org/) [SVG rendering](https://docs.mathjax.org/en/latest/output/svg.html). Defaults to KaTeX.
+- `customMacros`: custom macros for all LaTeX blocks. It takes the form of a key-value pair where the key is a new command name and the value is the expansion of the macro. For example: `{"\\R": "\\mathbb{R}"}`
 
 ## API
 
diff --git a/docs/showcase.md b/docs/showcase.md
index 8730c35d3..5fd71336a 100644
--- a/docs/showcase.md
+++ b/docs/showcase.md
@@ -25,5 +25,6 @@ Want to see what Quartz can do? Here are some cool community gardens:
 - [🪴Aster's notebook](https://notes.asterhu.com)
 - [Gatekeeper Wiki](https://www.gatekeeper.wiki)
 - [Ellie's Notes](https://ellie.wtf)
+- [🥷🏻🌳🍃 Computer Science & Thinkering Garden](https://notes.yxy.ninja)
 
 If you want to see your own on here, submit a [Pull Request adding yourself to this file](https://github.com/jackyzha0/quartz/blob/v4/docs/showcase.md)!
diff --git a/quartz/build.ts b/quartz/build.ts
index 972a7e850..342a27c92 100644
--- a/quartz/build.ts
+++ b/quartz/build.ts
@@ -38,8 +38,13 @@ type BuildData = {
 
 type FileEvent = "add" | "change" | "delete"
 
+function newBuildId() {
+  return new Date().toISOString()
+}
+
 async function buildQuartz(argv: Argv, mut: Mutex, clientRefresh: () => void) {
   const ctx: BuildCtx = {
+    buildId: newBuildId(),
     argv,
     cfg,
     allSlugs: [],
@@ -167,6 +172,7 @@ async function partialRebuildFromEntrypoint(
 
   const perf = new PerfTimer()
   console.log(chalk.yellow("Detected change, rebuilding..."))
+  ctx.buildId = newBuildId()
 
   // UPDATE DEP GRAPH
   const fp = joinSegments(argv.directory, toPosixPath(filepath)) as FilePath
@@ -363,14 +369,10 @@ async function rebuildFromEntrypoint(
 
   const perf = new PerfTimer()
   console.log(chalk.yellow("Detected change, rebuilding..."))
+  ctx.buildId = newBuildId()
+
   try {
     const filesToRebuild = [...toRebuild].filter((fp) => !toRemove.has(fp))
-
-    const trackedSlugs = [...new Set([...contentMap.keys(), ...toRebuild, ...trackedAssets])]
-      .filter((fp) => !toRemove.has(fp))
-      .map((fp) => slugifyFilePath(path.posix.relative(argv.directory, fp) as FilePath))
-
-    ctx.allSlugs = [...new Set([...initialSlugs, ...trackedSlugs])]
     const parsedContent = await parseMarkdown(ctx, filesToRebuild)
     for (const content of parsedContent) {
       const [_tree, vfile] = content
@@ -384,6 +386,13 @@ async function rebuildFromEntrypoint(
     const parsedFiles = [...contentMap.values()]
     const filteredContent = filterContent(ctx, parsedFiles)
 
+    // re-update slugs
+    const trackedSlugs = [...new Set([...contentMap.keys(), ...toRebuild, ...trackedAssets])]
+      .filter((fp) => !toRemove.has(fp))
+      .map((fp) => slugifyFilePath(path.posix.relative(argv.directory, fp) as FilePath))
+
+    ctx.allSlugs = [...new Set([...initialSlugs, ...trackedSlugs])]
+
     // TODO: we can probably traverse the link graph to figure out what's safe to delete here
     // instead of just deleting everything
     await rimraf(path.join(argv.output, ".*"), { glob: true })
diff --git a/quartz/components/Explorer.tsx b/quartz/components/Explorer.tsx
index 24583a1f7..ec7c48ef7 100644
--- a/quartz/components/Explorer.tsx
+++ b/quartz/components/Explorer.tsx
@@ -44,12 +44,9 @@ export default ((userOpts?: Partial<Options>) => {
   // memoized
   let fileTree: FileNode
   let jsonTree: string
+  let lastBuildId: string = ""
 
   function constructFileTree(allFiles: QuartzPluginData[]) {
-    if (fileTree) {
-      return
-    }
-
     // Construct tree from allFiles
     fileTree = new FileNode("")
     allFiles.forEach((file) => fileTree.add(file))
@@ -76,12 +73,17 @@ export default ((userOpts?: Partial<Options>) => {
   }
 
   const Explorer: QuartzComponent = ({
+    ctx,
     cfg,
     allFiles,
     displayClass,
     fileData,
   }: QuartzComponentProps) => {
-    constructFileTree(allFiles)
+    if (ctx.buildId !== lastBuildId) {
+      lastBuildId = ctx.buildId
+      constructFileTree(allFiles)
+    }
+
     return (
       <div class={classNames(displayClass, "explorer")}>
         <button
@@ -91,6 +93,8 @@ export default ((userOpts?: Partial<Options>) => {
           data-collapsed={opts.folderDefaultState}
           data-savestate={opts.useSavedState}
           data-tree={jsonTree}
+          aria-controls="explorer-content"
+          aria-expanded={opts.folderDefaultState === "open"}
         >
           <h2>{opts.title ?? i18n(cfg.locale).components.explorer.title}</h2>
           <svg
diff --git a/quartz/components/TableOfContents.tsx b/quartz/components/TableOfContents.tsx
index 77ff0eb10..f3d8d7fbe 100644
--- a/quartz/components/TableOfContents.tsx
+++ b/quartz/components/TableOfContents.tsx
@@ -26,7 +26,13 @@ const TableOfContents: QuartzComponent = ({
 
   return (
     <div class={classNames(displayClass, "toc")}>
-      <button type="button" id="toc" class={fileData.collapseToc ? "collapsed" : ""}>
+      <button
+        type="button"
+        id="toc"
+        class={fileData.collapseToc ? "collapsed" : ""}
+        aria-controls="toc-content"
+        aria-expanded={!fileData.collapseToc}
+      >
         <h3>{i18n(cfg.locale).components.tableOfContents.title}</h3>
         <svg
           xmlns="http://www.w3.org/2000/svg"
diff --git a/quartz/components/scripts/explorer.inline.ts b/quartz/components/scripts/explorer.inline.ts
index 3eb25ead4..584de6c37 100644
--- a/quartz/components/scripts/explorer.inline.ts
+++ b/quartz/components/scripts/explorer.inline.ts
@@ -17,6 +17,10 @@ const observer = new IntersectionObserver((entries) => {
 
 function toggleExplorer(this: HTMLElement) {
   this.classList.toggle("collapsed")
+  this.setAttribute(
+    "aria-expanded",
+    this.getAttribute("aria-expanded") === "true" ? "false" : "true",
+  )
   const content = this.nextElementSibling as MaybeHTMLElement
   if (!content) return
 
diff --git a/quartz/components/scripts/toc.inline.ts b/quartz/components/scripts/toc.inline.ts
index 546859ed3..acc81b20d 100644
--- a/quartz/components/scripts/toc.inline.ts
+++ b/quartz/components/scripts/toc.inline.ts
@@ -16,6 +16,10 @@ const observer = new IntersectionObserver((entries) => {
 
 function toggleToc(this: HTMLElement) {
   this.classList.toggle("collapsed")
+  this.setAttribute(
+    "aria-expanded",
+    this.getAttribute("aria-expanded") === "true" ? "false" : "true",
+  )
   const content = this.nextElementSibling as HTMLElement | undefined
   if (!content) return
   content.classList.toggle("collapsed")
diff --git a/quartz/components/styles/explorer.scss b/quartz/components/styles/explorer.scss
index d4875e7c9..2f94b158c 100644
--- a/quartz/components/styles/explorer.scss
+++ b/quartz/components/styles/explorer.scss
@@ -1,7 +1,6 @@
 @use "../../styles/variables.scss" as *;
 
 button#explorer {
-  all: unset;
   background-color: transparent;
   border: none;
   text-align: left;
@@ -46,8 +45,18 @@ button#explorer {
   list-style: none;
   overflow: hidden;
   max-height: none;
-  transition: max-height 0.35s ease;
+  transition:
+    max-height 0.35s ease,
+    visibility 0s linear 0s;
   margin-top: 0.5rem;
+  visibility: visible;
+
+  &.collapsed {
+    transition:
+      max-height 0.35s ease,
+      visibility 0s linear 0.35s;
+    visibility: hidden;
+  }
 
   &.collapsed > .overflow::after {
     opacity: 0;
diff --git a/quartz/components/styles/toc.scss b/quartz/components/styles/toc.scss
index 27ff62a40..6845812f5 100644
--- a/quartz/components/styles/toc.scss
+++ b/quartz/components/styles/toc.scss
@@ -29,8 +29,18 @@ button#toc {
   list-style: none;
   overflow: hidden;
   max-height: none;
-  transition: max-height 0.5s ease;
+  transition:
+    max-height 0.5s ease,
+    visibility 0s linear 0s;
   position: relative;
+  visibility: visible;
+
+  &.collapsed {
+    transition:
+      max-height 0.5s ease,
+      visibility 0s linear 0.5s;
+    visibility: hidden;
+  }
 
   &.collapsed > .overflow::after {
     opacity: 0;
diff --git a/quartz/plugins/transformers/citations.ts b/quartz/plugins/transformers/citations.ts
index bb302e437..5242f37c5 100644
--- a/quartz/plugins/transformers/citations.ts
+++ b/quartz/plugins/transformers/citations.ts
@@ -17,7 +17,7 @@ const defaultOptions: Options = {
   csl: "apa",
 }
 
-export const Citations: QuartzTransformerPlugin<Partial<Options> | undefined> = (userOpts) => {
+export const Citations: QuartzTransformerPlugin<Partial<Options>> = (userOpts) => {
   const opts = { ...defaultOptions, ...userOpts }
   return {
     name: "Citations",
@@ -38,7 +38,7 @@ export const Citations: QuartzTransformerPlugin<Partial<Options> | undefined> =
       // using https://github.com/syntax-tree/unist-util-visit as they're just anochor links
       plugins.push(() => {
         return (tree, _file) => {
-          visit(tree, "element", (node, index, parent) => {
+          visit(tree, "element", (node, _index, _parent) => {
             if (node.tagName === "a" && node.properties?.href?.startsWith("#bib")) {
               node.properties["data-no-popover"] = true
             }
diff --git a/quartz/plugins/transformers/description.ts b/quartz/plugins/transformers/description.ts
index 5900745c4..c7e592ee9 100644
--- a/quartz/plugins/transformers/description.ts
+++ b/quartz/plugins/transformers/description.ts
@@ -18,7 +18,7 @@ const urlRegex = new RegExp(
   "g",
 )
 
-export const Description: QuartzTransformerPlugin<Partial<Options> | undefined> = (userOpts) => {
+export const Description: QuartzTransformerPlugin<Partial<Options>> = (userOpts) => {
   const opts = { ...defaultOptions, ...userOpts }
   return {
     name: "Description",
diff --git a/quartz/plugins/transformers/frontmatter.ts b/quartz/plugins/transformers/frontmatter.ts
index 5ab239a31..70a60d8b5 100644
--- a/quartz/plugins/transformers/frontmatter.ts
+++ b/quartz/plugins/transformers/frontmatter.ts
@@ -40,7 +40,7 @@ function coerceToArray(input: string | string[]): string[] | undefined {
     .map((tag: string | number) => tag.toString())
 }
 
-export const FrontMatter: QuartzTransformerPlugin<Partial<Options> | undefined> = (userOpts) => {
+export const FrontMatter: QuartzTransformerPlugin<Partial<Options>> = (userOpts) => {
   const opts = { ...defaultOptions, ...userOpts }
   return {
     name: "FrontMatter",
diff --git a/quartz/plugins/transformers/gfm.ts b/quartz/plugins/transformers/gfm.ts
index 48681ff77..eec26f7b9 100644
--- a/quartz/plugins/transformers/gfm.ts
+++ b/quartz/plugins/transformers/gfm.ts
@@ -14,9 +14,7 @@ const defaultOptions: Options = {
   linkHeadings: true,
 }
 
-export const GitHubFlavoredMarkdown: QuartzTransformerPlugin<Partial<Options> | undefined> = (
-  userOpts,
-) => {
+export const GitHubFlavoredMarkdown: QuartzTransformerPlugin<Partial<Options>> = (userOpts) => {
   const opts = { ...defaultOptions, ...userOpts }
   return {
     name: "GitHubFlavoredMarkdown",
diff --git a/quartz/plugins/transformers/lastmod.ts b/quartz/plugins/transformers/lastmod.ts
index 2c7b9ce47..fe8c01bcf 100644
--- a/quartz/plugins/transformers/lastmod.ts
+++ b/quartz/plugins/transformers/lastmod.ts
@@ -27,9 +27,7 @@ function coerceDate(fp: string, d: any): Date {
 }
 
 type MaybeDate = undefined | string | number
-export const CreatedModifiedDate: QuartzTransformerPlugin<Partial<Options> | undefined> = (
-  userOpts,
-) => {
+export const CreatedModifiedDate: QuartzTransformerPlugin<Partial<Options>> = (userOpts) => {
   const opts = { ...defaultOptions, ...userOpts }
   return {
     name: "CreatedModifiedDate",
diff --git a/quartz/plugins/transformers/latex.ts b/quartz/plugins/transformers/latex.ts
index c9f6bff0d..28b4d506a 100644
--- a/quartz/plugins/transformers/latex.ts
+++ b/quartz/plugins/transformers/latex.ts
@@ -5,10 +5,16 @@ import { QuartzTransformerPlugin } from "../types"
 
 interface Options {
   renderEngine: "katex" | "mathjax"
+  customMacros: MacroType
 }
 
-export const Latex: QuartzTransformerPlugin<Options> = (opts?: Options) => {
+interface MacroType {
+  [key: string]: string
+}
+
+export const Latex: QuartzTransformerPlugin<Partial<Options>> = (opts) => {
   const engine = opts?.renderEngine ?? "katex"
+  const macros = opts?.customMacros ?? {}
   return {
     name: "Latex",
     markdownPlugins() {
@@ -16,9 +22,9 @@ export const Latex: QuartzTransformerPlugin<Options> = (opts?: Options) => {
     },
     htmlPlugins() {
       if (engine === "katex") {
-        return [[rehypeKatex, { output: "html" }]]
+        return [[rehypeKatex, { output: "html", macros }]]
       } else {
-        return [rehypeMathjax]
+        return [[rehypeMathjax, { macros }]]
       }
     },
     externalResources() {
diff --git a/quartz/plugins/transformers/links.ts b/quartz/plugins/transformers/links.ts
index 280581828..b6a2c9122 100644
--- a/quartz/plugins/transformers/links.ts
+++ b/quartz/plugins/transformers/links.ts
@@ -8,7 +8,6 @@ import {
   simplifySlug,
   splitAnchor,
   transformLink,
-  joinSegments,
 } from "../../util/path"
 import path from "path"
 import { visit } from "unist-util-visit"
@@ -33,7 +32,7 @@ const defaultOptions: Options = {
   externalLinkIcon: true,
 }
 
-export const CrawlLinks: QuartzTransformerPlugin<Partial<Options> | undefined> = (userOpts) => {
+export const CrawlLinks: QuartzTransformerPlugin<Partial<Options>> = (userOpts) => {
   const opts = { ...defaultOptions, ...userOpts }
   return {
     name: "LinkProcessing",
diff --git a/quartz/plugins/transformers/ofm.ts b/quartz/plugins/transformers/ofm.ts
index a406c865f..0dea89384 100644
--- a/quartz/plugins/transformers/ofm.ts
+++ b/quartz/plugins/transformers/ofm.ts
@@ -136,9 +136,7 @@ const wikilinkImageEmbedRegex = new RegExp(
   /^(?<alt>(?!^\d*x?\d*$).*?)?(\|?\s*?(?<width>\d+)(x(?<height>\d+))?)?$/,
 )
 
-export const ObsidianFlavoredMarkdown: QuartzTransformerPlugin<Partial<Options> | undefined> = (
-  userOpts,
-) => {
+export const ObsidianFlavoredMarkdown: QuartzTransformerPlugin<Partial<Options>> = (userOpts) => {
   const opts = { ...defaultOptions, ...userOpts }
 
   const mdastToHtml = (ast: PhrasingContent | Paragraph) => {
diff --git a/quartz/plugins/transformers/oxhugofm.ts b/quartz/plugins/transformers/oxhugofm.ts
index 6e70bb190..cdbffcffd 100644
--- a/quartz/plugins/transformers/oxhugofm.ts
+++ b/quartz/plugins/transformers/oxhugofm.ts
@@ -47,9 +47,7 @@ const quartzLatexRegex = new RegExp(/\$\$[\s\S]*?\$\$|\$.*?\$/, "g")
  * markdown to make it compatible with quartz but the list of changes applied it
  * is not exhaustive.
  * */
-export const OxHugoFlavouredMarkdown: QuartzTransformerPlugin<Partial<Options> | undefined> = (
-  userOpts,
-) => {
+export const OxHugoFlavouredMarkdown: QuartzTransformerPlugin<Partial<Options>> = (userOpts) => {
   const opts = { ...defaultOptions, ...userOpts }
   return {
     name: "OxHugoFlavouredMarkdown",
diff --git a/quartz/plugins/transformers/syntax.ts b/quartz/plugins/transformers/syntax.ts
index f11734e5f..5d3aae0d8 100644
--- a/quartz/plugins/transformers/syntax.ts
+++ b/quartz/plugins/transformers/syntax.ts
@@ -19,10 +19,8 @@ const defaultOptions: Options = {
   keepBackground: false,
 }
 
-export const SyntaxHighlighting: QuartzTransformerPlugin<Options> = (
-  userOpts?: Partial<Options>,
-) => {
-  const opts: Partial<CodeOptions> = { ...defaultOptions, ...userOpts }
+export const SyntaxHighlighting: QuartzTransformerPlugin<Partial<Options>> = (userOpts) => {
+  const opts: CodeOptions = { ...defaultOptions, ...userOpts }
 
   return {
     name: "SyntaxHighlighting",
diff --git a/quartz/plugins/transformers/toc.ts b/quartz/plugins/transformers/toc.ts
index bfc2f9877..791547b6a 100644
--- a/quartz/plugins/transformers/toc.ts
+++ b/quartz/plugins/transformers/toc.ts
@@ -25,9 +25,7 @@ interface TocEntry {
 }
 
 const slugAnchor = new Slugger()
-export const TableOfContents: QuartzTransformerPlugin<Partial<Options> | undefined> = (
-  userOpts,
-) => {
+export const TableOfContents: QuartzTransformerPlugin<Partial<Options>> = (userOpts) => {
   const opts = { ...defaultOptions, ...userOpts }
   return {
     name: "TableOfContents",
diff --git a/quartz/processors/parse.ts b/quartz/processors/parse.ts
index 3950fee09..2bd530c64 100644
--- a/quartz/processors/parse.ts
+++ b/quartz/processors/parse.ts
@@ -143,7 +143,7 @@ export async function parseMarkdown(ctx: BuildCtx, fps: FilePath[]): Promise<Pro
 
     const childPromises: WorkerPromise<ProcessedContent[]>[] = []
     for (const chunk of chunks(fps, CHUNK_SIZE)) {
-      childPromises.push(pool.exec("parseFiles", [argv, chunk, ctx.allSlugs]))
+      childPromises.push(pool.exec("parseFiles", [ctx.buildId, argv, chunk, ctx.allSlugs]))
     }
 
     const results: ProcessedContent[][] = await WorkerPromise.all(childPromises).catch((err) => {
diff --git a/quartz/util/ctx.ts b/quartz/util/ctx.ts
index e05611418..044d21f68 100644
--- a/quartz/util/ctx.ts
+++ b/quartz/util/ctx.ts
@@ -14,6 +14,7 @@ export interface Argv {
 }
 
 export interface BuildCtx {
+  buildId: string
   argv: Argv
   cfg: QuartzConfig
   allSlugs: FullSlug[]
diff --git a/quartz/worker.ts b/quartz/worker.ts
index b92bdac94..a209df9a0 100644
--- a/quartz/worker.ts
+++ b/quartz/worker.ts
@@ -7,8 +7,14 @@ import { createFileParser, createProcessor } from "./processors/parse"
 import { options } from "./util/sourcemap"
 
 // only called from worker thread
-export async function parseFiles(argv: Argv, fps: FilePath[], allSlugs: FullSlug[]) {
+export async function parseFiles(
+  buildId: string,
+  argv: Argv,
+  fps: FilePath[],
+  allSlugs: FullSlug[],
+) {
   const ctx: BuildCtx = {
+    buildId,
     cfg,
     argv,
     allSlugs,