feat: auto-optimize images on CMS upload via AssetBucketBrowser

Enables the existing Sharp pipeline for all uploads — WebP conversion,
auto-orient, 2560px cap, content-hash filenames.  Upload toast now
shows compression savings percentage.

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

src/components/hq/AssetBucketBrowser.tsx

@@ -193,10 +193,17 @@ export default function AssetBucketBrowser({
       fd.append("slug", slug);
       fd.append("path", activeBucket.path);
       fd.append("file", file);
+      fd.append("optimize", "1");
       const res = await fetch("/api/assets", { method: "POST", body: fd });
       const data = await res.json();
       if (data.success) {
-        setUploadProgress(`✓ ${data.file.name}`);
+        const f = data.file;
+        if (f.optimized && f.savedBytes > 0) {
+          const pct = Math.round((f.savedBytes / f.originalBytes) * 100);
+          setUploadProgress(`✓ ${f.name} (−${pct}% optimized)`);
+        } else {
+          setUploadProgress(`✓ ${f.name}`);
+        }
         await fetchItems();
         setTimeout(() => setUploadProgress(""), 1500);
       } else {