chore: migrate to Tailwind CSS v4.0 (#632)

* chore: migrate PostCSS configuration to v4

* chore: update dependencies in package.json and package-lock.json

- Bump versions for autoprefixer, postcss, postcss-cli, prettier, and tailwindcss.
- Remove unused dependencies to streamline the project.

* chore: add @tailwindcss/postcss and update package-lock.json

* fix: update import paths in CSS files for consistency

* fix: change prefix from `hx-` to `hx:`

* chore: migrate primary color theme variables to CSS

* fix: remove unnecessary text decoration property from anchor styles in typography CSS

* fix: update CSS styles for improved consistency and clarity across components

* chore: clean up package.json and package-lock.json, remove unused dependencies, and update CSS imports for better organization

* fix: bulk replace prefix `hx-` with `hx:`

* fix: update tailwind css prefix

* fix: styling consistent issues

- steps counter fix in v4
- removed tailwind.css
- update hr border colors
- fix button cursor in v4
- fix border colors in various places

* fix: update class prefixes for consistency in menu and sidebar components

* fix: refine CSS classes and transitions for navbar and sidebar components

- Updated hamburger menu styles for improved animation and structure.
- Adjusted sidebar transition duration for smoother effects.
- Standardized class prefixes for consistency across components.

* fix: update border color in hero badge component for improved styling consistency

* fix: update tab button cursor style for improved user interaction

* chore: recompile css

* fix: dark mode color not applied for before / after elements

* fix: docs navigation

* chore: recompile CSS

* chore: update Tailwind CSS and PostCSS dependencies to version 4.0.17, recompile CSS, and add safelist

* fix: typo in class name and add back decoration-from-font for typography a tags

* fix: update class syntax for Tailwind CSS compatibility in mermaid code block

assets/css/components/steps.css

@@ -1,17 +1,22 @@
-.steps h3 {
-  counter-increment: step;
-
-  &:before {
-    @apply hx-absolute hx-w-[33px] hx-h-[33px];
-    @apply hx-border-4 hx-border-white hx-bg-gray-100 dark:hx-border-dark dark:hx-bg-neutral-800;
-    @apply hx-rounded-full hx-text-neutral-400 hx-text-base hx-font-normal hx-text-center -hx-indent-px;
-    @apply hx-mt-[3px] ltr:hx-ml-[-41px] rtl:hx-mr-[-44px];
-    content: counter(step);
+.steps {
+  :where(h2, h3, h4, h5, h6):not(.no-step-marker) {
+    counter-increment: step;
+    @apply hx:ltr:before:ml-[-41px] hx:rtl:before:mr-[-44px];
+    /* https://github.com/tailwindlabs/tailwindcss/issues/15597#issuecomment-2582673546 */
+    @apply hx:before:bg-gray-100 hx:dark:before:bg-neutral-800;
+    @apply hx:before:border-4 hx:before:border-white hx:dark:before:border-dark;
+    &:before {
+      content: counter(step);
+      @apply hx:absolute hx:size-[33px];
+      @apply hx:rounded-full hx:text-neutral-400 hx:text-base hx:font-normal hx:text-center hx:-indent-px;
+    }
   }
 }
 
-:lang(fa) .steps h3 {
-  &:before {
-    content: counter(step, persian);
+:lang(fa) .steps {
+  :where(h2, h3, h4, h5, h6):not(.no-step-marker) {
+    &:before {
+      content: counter(step, persian);
+    }
   }
 }