style: standardize import ordering, type imports, and formatting in source files

Sort imports alphabetically, convert value imports to type-only where
appropriate, normalize indentation to tabs, and sort exports
alphabetically across UI components, pages, and lib modules.

src/components/ui/button.tsx

@@ -1,6 +1,6 @@
-import * as React from "react";
 import { Slot } from "@radix-ui/react-slot";
 import { cva, type VariantProps } from "class-variance-authority";
+import type * as React from "react";
 
 import { cn } from "@/lib/utils";