fix: compression UI — proper before/after display with folds tokens

Always shows Original size pill even before checkbox is checked.
After checking: shows 'compressing...' then reveals Compressed pill
with exact size and percentage saved. Green tint on compressed pill
when >5% saving; neutral when minimal gain.

Replaced all var(--bg-*) / var(--tc-*) CSS vars with folds
color.Surface.* and color.SurfaceVariant.* tokens so the UI renders
correctly in all themes. Blob cleanup is automatic — the compressed
Blob is referenced only during upload and GC'd with the upload atom.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/components/upload-card/UploadCardRenderer.tsx

@@ -117,7 +117,6 @@ function CompressionCheckbox({ fileItem, metadata, setMetadata }: CompressionChe
       return;
     }
 
-    // Optimistically mark as enabled; kick off compression in background
     setMetadata(fileItem, { ...metadata, compressImage: true, compressionResult: undefined });
     setCompressing(true);
 
@@ -136,63 +135,108 @@ function CompressionCheckbox({ fileItem, metadata, setMetadata }: CompressionChe
       ? Math.round(((result.originalSize - result.compressedSize) / result.originalSize) * 100)
       : null;
 
+  const originalSize = formatFileSize(originalFile.size);
+
   return (
     <Box
       direction="Column"
-      gap="100"
+      gap="200"
       style={{
-        marginTop: '4px',
-        padding: '6px 8px',
-        background: 'var(--bg-surface-low)',
-        borderRadius: '6px',
-        border: '1px solid var(--bg-surface-border)',
-        fontSize: '0.8rem',
+        marginTop: config.space.S100,
+        padding: `${config.space.S200} ${config.space.S300}`,
+        background: color.SurfaceVariant.Container,
+        borderRadius: config.radii.R300,
+        border: `1px solid ${color.SurfaceVariant.ContainerLine}`,
       }}
     >
+      {/* Checkbox row */}
       <Box alignItems="Center" gap="200">
         <input
           id={`compress-${originalFile.name}-${originalFile.size}`}
           type="checkbox"
           checked={checked}
           onChange={handleChange}
-          style={{ cursor: 'pointer', accentColor: 'var(--bg-secondary)' }}
+          style={{ cursor: 'pointer', flexShrink: 0 }}
         />
         <label
           htmlFor={`compress-${originalFile.name}-${originalFile.size}`}
-          style={{ cursor: 'pointer', color: 'var(--text-primary)', userSelect: 'none' }}
+          style={{
+            cursor: 'pointer',
+            color: color.SurfaceVariant.OnContainer,
+            userSelect: 'none',
+            fontSize: '0.8rem',
+          }}
         >
           Compress before uploading
         </label>
         {compressing && (
-          <Text size="T200" style={{ color: 'var(--text-secondary)', marginLeft: '4px' }}>
-            estimating…
+          <Text size="T200" style={{ opacity: 0.6, marginLeft: 'auto' }}>
+            compressing…
           </Text>
         )}
       </Box>
-      {checked && !compressing && result !== undefined && (
-        <Text
-          size="T200"
+
+      {/* Before / after row — always show original; show compressed when ready */}
+      <Box gap="200" alignItems="Center" wrap="Wrap">
+        <Box
+          gap="100"
+          alignItems="Center"
           style={{
-            color: result
-              ? savingPct !== null && savingPct > 0
-                ? 'var(--tc-success-normal, #2e7d32)'
-                : 'var(--text-secondary)'
-              : 'var(--tc-danger-normal)',
-            paddingLeft: '20px',
+            padding: `2px ${config.space.S200}`,
+            borderRadius: config.radii.R300,
+            background: color.Surface.Container,
+            border: `1px solid ${color.Surface.ContainerLine}`,
           }}
         >
-          {result
-            ? savingPct !== null && savingPct > 0
-              ? `→ ~${formatFileSize(result.compressedSize)} (${savingPct}% smaller)`
-              : `→ ${formatFileSize(result.compressedSize)} (no significant saving)`
-            : 'Compression not available for this file'}
-        </Text>
-      )}
-      {checked && !compressing && result === undefined && (
-        <Text size="T200" style={{ color: 'var(--text-secondary)', paddingLeft: '20px' }}>
-          Original: {formatFileSize(originalFile.size)}
-        </Text>
-      )}
+          <Text size="T200" style={{ opacity: 0.6 }}>
+            Original
+          </Text>
+          <Text size="T200" style={{ fontWeight: 600 }}>
+            {originalSize}
+          </Text>
+        </Box>
+
+        {checked && !compressing && result !== undefined && (
+          <>
+            <Text size="T200" style={{ opacity: 0.5 }}>
+              →
+            </Text>
+            <Box
+              gap="100"
+              alignItems="Center"
+              style={{
+                padding: `2px ${config.space.S200}`,
+                borderRadius: config.radii.R300,
+                background:
+                  savingPct !== null && savingPct > 5
+                    ? (color.Success?.Container ?? color.Primary.Container)
+                    : color.Surface.Container,
+                border: `1px solid ${
+                  savingPct !== null && savingPct > 5
+                    ? (color.Success?.ContainerLine ?? color.Primary.ContainerLine)
+                    : color.Surface.ContainerLine
+                }`,
+              }}
+            >
+              <Text size="T200" style={{ opacity: 0.6 }}>
+                Compressed
+              </Text>
+              {result ? (
+                <Text size="T200" style={{ fontWeight: 600 }}>
+                  {formatFileSize(result.compressedSize)}
+                  {savingPct !== null && savingPct > 0 && (
+                    <span style={{ opacity: 0.7, marginLeft: 4 }}>({savingPct}% smaller)</span>
+                  )}
+                </Text>
+              ) : (
+                <Text size="T200" style={{ opacity: 0.6 }}>
+                  unavailable
+                </Text>
+              )}
+            </Box>
+          </>
+        )}
+      </Box>
     </Box>
   );
 }