listings - sort categories case-insensitively (#8238)

Author: cscheid

tests/docs/smoke-all/2025/04/01/issue-8238/.gitignore

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+/.quarto/

tests/docs/smoke-all/2025/04/01/issue-8238/_quarto.yml

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+project:
+  type: website
+
+website:
+  title: "issue-8238"
+  navbar:
+    left:
+      - href: index.qmd
+        text: Home
+      - about.qmd
+
+format:
+  html:
+    theme:
+      - cosmo
+      - brand
+    css: styles.css
+    toc: true
+
+
+

tests/docs/smoke-all/2025/04/01/issue-8238/about.qmd

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+---
+title: "About"
+---
+
+About this site

tests/docs/smoke-all/2025/04/01/issue-8238/index.qmd

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+---
+title: "issue-8238"
+listing: 
+  - id: reports
+    contents: "lab-reports"
+    type: table
+    fields: [title, author, reading-time]
+    categories: true
+_quarto:
+  render-project: true
+  tests:
+    html:
+      ensureHtmlElements:
+        - ['div.quarto-listing-category div.category:nth-child(2)[data-category="YWFyZHZhcms="]']
+        - []
+---
+
+This is a Quarto website.
+
+To learn more about Quarto websites visit <https://quarto.org/docs/websites>.
+
+## Reports
+
+:::{#reports}
+:::

tests/docs/smoke-all/2025/04/01/issue-8238/lab-reports/1.qmd

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+---
+title: Aardvark
+author: Anthony
+categories:
+  - aardvark
+---
+
+## It starts with aardvarks

tests/docs/smoke-all/2025/04/01/issue-8238/lab-reports/2.qmd

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+---
+title: Zebra
+author: Zack
+categories:
+  - Zebra
+---
+
+## It ends with Zebras

tests/docs/smoke-all/2025/04/01/issue-8238/styles.css

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+/* css styles */