[UXIT-3464] Add compact Upload component

src/components/upload/drag-n-drop.tsx

@@ -1,5 +1,6 @@
 import { Root } from '@radix-ui/react-form'
 import { useState } from 'react'
+import { MAX_FILE_SIZE } from '@/constants/files.ts'
 import { FilePicker } from '../file-picker/index.tsx'
 import { ButtonBase as Button } from '../ui/button/button-base.tsx'
 
@@ -32,7 +33,7 @@ export default function DragNDrop({ onFileSelected, onUpload, isUploading }: Dra
     <Root className="space-y-6" onSubmit={(e) => e.preventDefault()}>
       <FilePicker
         file={file}
-        maxSize={200_000_000}
+        maxSize={MAX_FILE_SIZE}
         onChange={(file) => {
           setFile(file)
           if (file && onFileSelected) {

src/components/upload/upload-button.tsx

@@ -0,0 +1,80 @@
+import { FormControl, FormField, FormMessage, Root } from '@radix-ui/react-form'
+import { PlusIcon } from 'lucide-react'
+import { useRef, useState } from 'react'
+import { MAX_FILE_SIZE } from '@/constants/files.ts'
+import { formatFileSize } from '@/utils/format-file-size.ts'
+import { ButtonBase as Button } from '../ui/button/button-base.tsx'
+
+interface UploadButtonProps {
+  onUpload: (file: File) => void
+  isUploading?: boolean
+  accept?: string[]
+  maxSize?: number
+}
+
+export function UploadButton({
+  onUpload,
+  isUploading = false,
+  accept = ['*'],
+  maxSize = MAX_FILE_SIZE,
+}: UploadButtonProps) {
+  const fileInputRef = useRef<HTMLInputElement>(null)
+  const [error, setError] = useState<string | null>(null)
+
+  function handleButtonClick() {
+    fileInputRef.current?.click()
+  }
+
+  function handleFileChange(e: React.ChangeEvent<HTMLInputElement>) {
+    const file = e.target.files?.[0]
+    if (file) {
+      if (file.size > maxSize) {
+        setError(`File is too large. Maximum size is ${formatFileSize(maxSize)}.`)
+        if (fileInputRef.current) fileInputRef.current.value = ''
+        return
+      }
+
+      setError(null)
+      onUpload(file)
+      if (fileInputRef.current) fileInputRef.current.value = ''
+    }
+  }
+
+  return (
+    <Root className="flex flex-col gap-2 items-end" onSubmit={(e) => e.preventDefault()}>
+      <FormField name="file">
+        <FormControl asChild>
+          <input
+            accept={accept.join(',')}
+            className="hidden"
+            multiple={false}
+            onChange={handleFileChange}
+            ref={fileInputRef}
+            type="file"
+          />
+        </FormControl>
+      </FormField>
+      <div className="w-content">
+        <Button
+          disabled={isUploading}
+          loading={isUploading}
+          onClick={handleButtonClick}
+          type="button"
+          variant="primary"
+        >
+          <div className="flex items-center gap-2">
+            <PlusIcon size={20} />
+            <span>Add file</span>
+          </div>
+        </Button>
+      </div>
+      <div className="h-3">
+        {error && (
+          <FormField name="file">
+            <FormMessage className="text-sm text-red-500 mt-1 break-words max-w-full">{error}</FormMessage>
+          </FormField>
+        )}
+      </div>
+    </Root>
+  )
+}

src/constants/files.ts

@@ -0,0 +1 @@
+export const MAX_FILE_SIZE = 200_000_000