Update Tailwind PostCSS plugin to 4.1.18 (#3179)

The reason we needed to rename our config keys from camelCase to
kebab-case was because of:
tailwindlabs/tailwindcss#19337

Author: AndreasArvidsson

packages/cheatsheet-local/package.json

@@ -34,7 +34,7 @@
   },
   "devDependencies": {
     "@effortlessmotion/html-webpack-inline-source-plugin": "^1.0.3",
-    "@tailwindcss/postcss": "4.1.17",
+    "@tailwindcss/postcss": "4.1.18",
     "@testing-library/dom": "^10.4.1",
     "@testing-library/react": "^16.3.2",
     "@types/jest": "^30.0.0",

packages/cursorless-org-docs/package.json

@@ -65,7 +65,7 @@
     "@cursorless/node-common": "workspace:*",
     "@docusaurus/module-type-aliases": "^3.9.2",
     "@docusaurus/types": "^3.9.2",
-    "@tailwindcss/postcss": "4.1.17",
+    "@tailwindcss/postcss": "4.1.18",
     "@tsconfig/docusaurus": "^2.0.9",
     "@types/mdast": "^4.0.4",
     "@types/react": "^19.2.14",

packages/cursorless-org/package.json

@@ -41,7 +41,7 @@
   "devDependencies": {
     "@eslint/compat": "^2.0.2",
     "@svgr/webpack": "^8.1.0",
-    "@tailwindcss/postcss": "4.1.17",
+    "@tailwindcss/postcss": "4.1.18",
     "@types/mdx": "^2.0.13",
     "@types/node": "^25.2.3",
     "@types/react": "^19.2.14",

packages/cursorless-org/tailwind.config.js

@@ -58,19 +58,22 @@ export default {
       },
       fontFamily: {
         mono: ["Inconsolata", ...defaultTheme.fontFamily.mono],
-        monoWide: ["Inconsolata-SemiExpanded", ...defaultTheme.fontFamily.mono],
+        "mono-wide": [
+          "Inconsolata-SemiExpanded",
+          ...defaultTheme.fontFamily.mono,
+        ],
       },
       width: {
-        smBase: smallWidth,
-        stretchedBase: stretchedWidth,
+        "sm-base": smallWidth,
+        "stretched-base": stretchedWidth,
       },
       height: {
-        smBase: smallHeight,
-        stretchedBase: stretchedHeight,
+        "sm-base": smallHeight,
+        "stretched-base": stretchedHeight,
       },
       fontSize: {
-        smBase: smallFontSize,
-        stretchedBase: stretchedFontSize,
+        "sm-base": smallFontSize,
+        "stretched-base": stretchedFontSize,
         xs: "1.2em",
         lg: "1.8em",
         "2xl": "2.4em",