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/navbar.css

@@ -1,6 +1,6 @@
 nav {
   .search-wrapper {
-    @apply hx-hidden md:hx-inline-block;
+    @apply hx:hidden hx:md:inline-block;
   }
 }
 
@@ -8,48 +8,43 @@ nav {
   (-webkit-backdrop-filter: blur(1px)) or (backdrop-filter: blur(1px))
 ) {
   .nav-container-blur {
-    @apply hx-backdrop-blur-md hx-bg-white/[.85] dark:!hx-bg-dark/80;
+    @apply hx:backdrop-blur-md hx:bg-white/[.85] hx:dark:bg-dark/80!;
   }
 }
 
-.hamburger-menu svg {
-  g {
-    @apply hx-origin-center;
-    transition: transform 0.2s cubic-bezier(0.25, 1, 0.5, 1);
-  }
-  path {
-    opacity: 1;
-    transition:
-      transform 0.2s cubic-bezier(0.25, 1, 0.5, 1) 0.2s,
-      opacity 0.2s ease 0.2s;
-  }
-
-  &.open {
-    path {
-      transition:
-        transform 0.2s cubic-bezier(0.25, 1, 0.5, 1),
-        opacity 0s ease 0.2s;
-    }
-    g {
-      transition: transform 0.2s cubic-bezier(0.25, 1, 0.5, 1) 0.2s;
-    }
-  }
-
-  &.open > {
-    path {
-      @apply hx-opacity-0;
-    }
-    g:nth-of-type(1) {
-      @apply hx-rotate-45;
-      path {
-        transform: translate3d(0, 4px, 0);
-      }
-    }
-    g:nth-of-type(2) {
-      @apply -hx-rotate-45;
-      path {
-        transform: translate3d(0, -4px, 0);
-      }
-    }
-  }
+/* Hamburger Menu - Flattened Structure */
+.hamburger-menu svg g {
+  @apply hx:origin-center hx:transition-all hx:duration-100 hx:ease-out;
+}
+
+.hamburger-menu svg path {
+  @apply hx:opacity-100 hx:transition-all hx:duration-100 hx:ease-out hx:delay-100;
+}
+
+.hamburger-menu svg.open path {
+  @apply hx:transition-transform hx:duration-100 hx:ease-out hx:delay-0;
+}
+
+.hamburger-menu svg.open g {
+  @apply hx:transition-transform hx:duration-100 hx:ease-out hx:delay-100;
+}
+
+.hamburger-menu svg.open > path {
+  @apply hx:opacity-0;
+}
+
+.hamburger-menu svg.open > g:nth-of-type(1) {
+  @apply hx:rotate-45;
+}
+
+.hamburger-menu svg.open > g:nth-of-type(1) path {
+  @apply hx:translate-y-1;
+}
+
+.hamburger-menu svg.open > g:nth-of-type(2) {
+  @apply hx:-rotate-45;
+}
+
+.hamburger-menu svg.open > g:nth-of-type(2) path {
+  @apply hx:-translate-y-1;
 }