feat(frontend): restyle format picker and add file size to the config card

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

frontend/src/components/FileConfigCard.jsx

@@ -1,4 +1,5 @@
 import { File as FileIcon } from '@phosphor-icons/react';
+import { formatBytes } from '../utils/formatBytes.js';
 
 const QUALITY_FORMATS = ['jpg', 'jpeg', 'webp', 'avif', 'tiff'];
 const ICON_SIZES = [16, 32, 48, 256, 512];
@@ -7,21 +8,28 @@ const DEFAULT_ICON_SIZE = 256;
 export function FileConfigCard({ item, index, t, onTargetFormatChange, onQualityChange, onIconSizeChange }) {
   return (
     <li className="file-config-card">
-      <FileIcon size={24} weight="regular" />
-      <span className="file-config-name">{item.file.name}</span>
+      <div className="file-tile-header">
+        <FileIcon size={24} weight="regular" />
+        <span className="file-tile-name">{item.file.name}</span>
+        <span className="file-tile-size">{formatBytes(item.file.size)}</span>
+      </div>
 
       {item.targets.length > 0 ? (
         <div className="file-config-controls">
-          <select
-            value={item.targetFormat ?? ''}
-            onChange={(event) => onTargetFormatChange(index, event.target.value)}
-          >
-            {item.targets.map((target) => (
-              <option key={target} value={target}>
-                {target}
-              </option>
-            ))}
-          </select>
+          <div className="format-select-group">
+            <select
+              className="format-select"
+              value={item.targetFormat ?? ''}
+              onChange={(event) => onTargetFormatChange(index, event.target.value)}
+            >
+              {item.targets.map((target) => (
+                <option key={target} value={target}>
+                  {target}
+                </option>
+              ))}
+            </select>
+            {item.targetFormat && <span className="format-badge">{item.targetFormat.toUpperCase()}</span>}
+          </div>
 
           {QUALITY_FORMATS.includes(item.targetFormat) && (
             <label>

frontend/src/styles/home.css

@@ -59,11 +59,26 @@
   border-radius: 8px;
 }
 
-.file-config-name {
-  font-weight: 500;
+.file-tile-header {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
   flex: 1 1 100%;
 }
 
+.file-tile-name {
+  font-weight: 500;
+  flex: 1 1 auto;
+  overflow-wrap: anywhere;
+}
+
+.file-tile-size {
+  font-size: 0.875rem;
+  color: var(--color-foreground);
+  opacity: 0.65;
+  white-space: nowrap;
+}
+
 .file-config-controls {
   display: flex;
   flex-direction: column;
@@ -71,6 +86,52 @@
   flex: 1 1 100%;
 }
 
+.file-config-controls label {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  font-size: 0.875rem;
+}
+
+.format-select-group {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+}
+
+.format-select {
+  appearance: none;
+  background-color: var(--color-background);
+  color: var(--color-foreground);
+  border: 1px solid var(--color-border);
+  border-radius: 8px;
+  padding: 0.5rem 2rem 0.5rem 0.75rem;
+  font-weight: 500;
+  min-height: 44px;
+  background-image:
+    linear-gradient(45deg, transparent 50%, var(--color-foreground) 50%),
+    linear-gradient(135deg, var(--color-foreground) 50%, transparent 50%);
+  background-position:
+    calc(100% - 17px) calc(1.15em),
+    calc(100% - 12px) calc(1.15em);
+  background-size: 5px 5px, 5px 5px;
+  background-repeat: no-repeat;
+}
+
+.format-select:focus-visible {
+  border-color: var(--color-ring);
+}
+
+.format-badge {
+  background: var(--color-muted);
+  color: var(--color-primary);
+  border-radius: 999px;
+  padding: 0.25rem 0.6rem;
+  font-size: 0.75rem;
+  font-weight: 700;
+  letter-spacing: 0.03em;
+}
+
 .convert-button {
   background: var(--color-accent);
   color: var(--color-on-primary);