feat: refactor theme, add tailwind-scrollbar, and improve UI components

- Removed manual theme switching logic and ThemeProvider
- Installed and configured tailwind-scrollbar plugin
- Updated FileConverter and ConversionOptions to use shadcn Input
- Refactored FontSelector to use shadcn Tabs
- Simplified global styles and adjusted glassmorphic effects

pnpm-lock.yaml

@@ -111,6 +111,9 @@ importers:
       shadcn:
         specifier: ^3.8.5
         version: 3.8.5(@types/node@25.3.0)(typescript@5.9.3)
+      tailwind-scrollbar:
+        specifier: ^4.0.2
+        version: 4.0.2(react@19.2.4)(tailwindcss@4.2.0)
       tailwindcss:
         specifier: ^4.2.0
         version: 4.2.0
@@ -1514,6 +1517,9 @@ packages:
   '@types/node@25.3.0':
     resolution: {integrity: sha512-4K3bqJpXpqfg2XKGK9bpDTc6xO/xoUP/RBWS7AtRMug6zZFaRekiLzjVtAoZMquxoAbzBvy5nxQ7veS5eYzf8A==}
 
+  '@types/prismjs@1.26.6':
+    resolution: {integrity: sha512-vqlvI7qlMvcCBbVe0AKAb4f97//Hy0EBTaiW8AalRnG/xAN5zOiWWyrNqNXeq8+KAuvRewjCVY1+IPxk4RdNYw==}
+
   '@types/react-dom@19.2.3':
     resolution: {integrity: sha512-jp2L/eY6fn+KgVVQAOqYItbF0VY/YApe5Mz2F0aykSO8gx31bYCZyvSeYxCHKvzHG5eZjc+zyaS5BrBWya2+kQ==}
     peerDependencies:
@@ -3315,6 +3321,11 @@ packages:
     resolution: {integrity: sha512-gjVS5hOP+M3wMm5nmNOucbIrqudzs9v/57bWRHQWLYklXqoXKrVfYW2W9+glfGsqtPgpiz5WwyEEB+ksXIx3gQ==}
     engines: {node: '>=18'}
 
+  prism-react-renderer@2.4.1:
+    resolution: {integrity: sha512-ey8Ls/+Di31eqzUxC46h8MksNuGx/n0AAC8uKpwFau4RPDYLuE3EXTp8N8G2vX2N7UC/+IXeNUnlWBGGcAG+Ig==}
+    peerDependencies:
+      react: '>=16.0.0'
+
   process-nextick-args@2.0.1:
     resolution: {integrity: sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag==}
 
@@ -3691,6 +3702,12 @@ packages:
   tailwind-merge@3.5.0:
     resolution: {integrity: sha512-I8K9wewnVDkL1NTGoqWmVEIlUcB9gFriAEkXkfCjX5ib8ezGxtR3xD7iZIxrfArjEsH7F1CHD4RFUtxefdqV/A==}
 
+  tailwind-scrollbar@4.0.2:
+    resolution: {integrity: sha512-wAQiIxAPqk0MNTPptVe/xoyWi27y+NRGnTwvn4PQnbvB9kp8QUBiGl/wsfoVBHnQxTmhXJSNt9NHTmcz9EivFA==}
+    engines: {node: '>=12.13.0'}
+    peerDependencies:
+      tailwindcss: 4.x
+
   tailwindcss@4.2.0:
     resolution: {integrity: sha512-yYzTZ4++b7fNYxFfpnberEEKu43w44aqDMNM9MHMmcKuCH7lL8jJ4yJ7LGHv7rSwiqM0nkiobF9I6cLlpS2P7Q==}
 
@@ -5391,6 +5408,8 @@ snapshots:
     dependencies:
       undici-types: 7.18.2
 
+  '@types/prismjs@1.26.6': {}
+
   '@types/react-dom@19.2.3(@types/react@19.2.14)':
     dependencies:
       '@types/react': 19.2.14
@@ -7312,6 +7331,12 @@ snapshots:
     dependencies:
       parse-ms: 4.0.0
 
+  prism-react-renderer@2.4.1(react@19.2.4):
+    dependencies:
+      '@types/prismjs': 1.26.6
+      clsx: 2.1.1
+      react: 19.2.4
+
   process-nextick-args@2.0.1: {}
 
   prompts@2.4.2:
@@ -7860,6 +7885,13 @@ snapshots:
 
   tailwind-merge@3.5.0: {}
 
+  tailwind-scrollbar@4.0.2(react@19.2.4)(tailwindcss@4.2.0):
+    dependencies:
+      prism-react-renderer: 2.4.1(react@19.2.4)
+      tailwindcss: 4.2.0
+    transitivePeerDependencies:
+      - react
+
   tailwindcss@4.2.0: {}
 
   tapable@2.3.0: {}