feat: add radix color theming (#133)

* chore: migrate tailwind v4 and add theme scaffolding

* feat: integrate radix colors and theme switching

* pnpm version

package.json

@@ -26,6 +26,7 @@
   },
   "dependencies": {
     "@opencode-ai/sdk": "^1.1.19",
+    "@radix-ui/colors": "^3.0.0",
     "@tauri-apps/api": "^2.0.0",
     "@tauri-apps/plugin-dialog": "~2.6.0",
     "@tauri-apps/plugin-opener": "^2.5.3",
@@ -36,10 +37,9 @@
     "solid-js": "^1.9.0"
   },
   "devDependencies": {
+    "@tailwindcss/vite": "^4.1.18",
     "@tauri-apps/cli": "^2.0.0",
-    "autoprefixer": "^10.4.20",
-    "postcss": "^8.5.0",
-    "tailwindcss": "^3.4.17",
+    "tailwindcss": "^4.1.18",
     "typescript": "^5.6.3",
     "vite": "^6.0.1",
     "vite-plugin-solid": "^2.11.0"
@@ -48,5 +48,6 @@
     "onlyBuiltDependencies": [
       "esbuild"
     ]
-  }
-}
+  },
+  "packageManager": "pnpm@10.27.0"
+}