feat: track logo drag and drop

client/portal/src/pages/admin/sponsors/store.ts

@@ -94,7 +94,13 @@ export const useSponsorsStore = create<SponsorsState>((set) => ({
   },
 
   uploadLogo: async (sponsorId: string, file: File) => {
-    const logo = await prepareLogoForUpload(file);
+    let logo;
+    try {
+      logo = await prepareLogoForUpload(file);
+    } catch {
+      toast.error("Couldn't read that image. Try a different file.");
+      return null;
+    }
     if (logo.byteLength > MAX_LOGO_BYTES) {
       toast.error("Logo is still too large after compression.");
       return null;

client/portal/src/pages/admin/tracks/components/TrackFormDialog.tsx

@@ -51,12 +51,10 @@ function TrackForm({
   const [displayOrder, setDisplayOrder] = useState(track?.display_order ?? 0);
   const [logoFile, setLogoFile] = useState<File | null>(null);
   const [logoPreview, setLogoPreview] = useState<string>(logoPreviewFor(track));
+  const [isDraggingLogo, setIsDraggingLogo] = useState(false);
   const logoInputRef = useRef<HTMLInputElement>(null);
 
-  const handleLogoChange = (e: React.ChangeEvent<HTMLInputElement>) => {
-    const file = e.target.files?.[0];
-    if (!file) return;
-
+  const acceptLogoFile = (file: File) => {
     if (!ALLOWED_LOGO_TYPES.includes(file.type)) {
       toast.error("Unsupported file type. Use PNG, JPEG, WebP, or GIF.");
       return;
@@ -73,6 +71,31 @@ function TrackForm({
     reader.readAsDataURL(file);
   };
 
+  const handleLogoChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+    const file = e.target.files?.[0];
+    if (file) acceptLogoFile(file);
+  };
+
+  const handleLogoDragOver = (e: React.DragEvent<HTMLButtonElement>) => {
+    if (!e.dataTransfer.types.includes("Files")) return;
+    e.preventDefault();
+    e.dataTransfer.dropEffect = "copy";
+    setIsDraggingLogo(true);
+  };
+
+  const handleLogoDragLeave = (e: React.DragEvent<HTMLButtonElement>) => {
+    // dragleave also fires when moving onto a child; only reset on real exit.
+    if (e.currentTarget.contains(e.relatedTarget as Node | null)) return;
+    setIsDraggingLogo(false);
+  };
+
+  const handleLogoDrop = (e: React.DragEvent<HTMLButtonElement>) => {
+    e.preventDefault();
+    setIsDraggingLogo(false);
+    const file = e.dataTransfer.files[0];
+    if (file) acceptLogoFile(file);
+  };
+
   const clearLogo = () => {
     setLogoFile(null);
     setLogoPreview(logoPreviewFor(track));
@@ -124,52 +147,64 @@ function TrackForm({
     <form onSubmit={handleSubmit} className="space-y-4">
       <div className="space-y-2">
         <Label>Logo</Label>
-        <div className="flex items-center gap-3">
-          {logoPreview ? (
-            <img
-              src={logoPreview}
-              alt="Logo preview"
-              className="size-12 rounded object-contain border"
-            />
-          ) : (
-            <div className="size-12 rounded border border-dashed flex items-center justify-center text-muted-foreground">
-              <ImagePlus className="size-5" />
-            </div>
-          )}
-          <div className="flex items-center gap-2">
-            <input
-              ref={logoInputRef}
-              type="file"
-              accept={ALLOWED_LOGO_TYPES.join(",")}
-              className="hidden"
-              onChange={handleLogoChange}
-            />
+        <input
+          ref={logoInputRef}
+          type="file"
+          accept={ALLOWED_LOGO_TYPES.join(",")}
+          className="hidden"
+          onChange={handleLogoChange}
+        />
+        <div className="relative">
+          <button
+            type="button"
+            onClick={() => logoInputRef.current?.click()}
+            onDragOver={handleLogoDragOver}
+            onDragLeave={handleLogoDragLeave}
+            onDrop={handleLogoDrop}
+            className={`flex h-32 w-full cursor-pointer flex-col items-center justify-center gap-2 rounded-lg border-2 border-dashed px-4 text-center transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring ${
+              isDraggingLogo
+                ? "border-primary bg-primary/5"
+                : "border-muted-foreground/25 hover:border-muted-foreground/50 hover:bg-muted/50"
+            }`}
+          >
+            {logoPreview ? (
+              <>
+                <img
+                  src={logoPreview}
+                  alt="Logo preview"
+                  className="h-16 max-w-full object-contain"
+                />
+                <span className="text-xs text-muted-foreground">
+                  Drop or click to replace
+                </span>
+              </>
+            ) : (
+              <>
+                <ImagePlus className="size-4 text-muted-foreground" />
+                <span className="text-sm font-medium">
+                  {isDraggingLogo
+                    ? "Drop to upload"
+                    : "Drop logo here or click to browse"}
+                </span>
+                <span className="text-xs text-muted-foreground">
+                  PNG, JPEG, WebP, or GIF · max 10MB
+                </span>
+              </>
+            )}
+          </button>
+          {logoFile && (
             <Button
               type="button"
-              variant="outline"
-              size="sm"
-              onClick={() => logoInputRef.current?.click()}
-              className="cursor-pointer"
+              variant="ghost"
+              size="icon-sm"
+              onClick={clearLogo}
+              aria-label="Remove selected logo"
+              className="absolute right-1.5 top-1.5 cursor-pointer text-muted-foreground hover:text-foreground"
             >
-              <ImagePlus className="mr-1 size-3" />
-              {logoPreview ? "Replace" : "Choose file"}
+              <X className="size-4" />
             </Button>
-            {logoFile && (
-              <Button
-                type="button"
-                variant="ghost"
-                size="icon-sm"
-                onClick={clearLogo}
-                className="cursor-pointer text-muted-foreground hover:text-foreground"
-              >
-                <X className="size-4" />
-              </Button>
-            )}
-          </div>
+          )}
         </div>
-        <p className="text-xs text-muted-foreground">
-          PNG, JPEG, WebP, or GIF (max 750KB)
-        </p>
       </div>
 
       <div className="space-y-2">

client/portal/src/pages/admin/tracks/store.ts

@@ -111,7 +111,13 @@ export const useTracksStore = create<TracksState>((set) => ({
   },
 
   uploadLogo: async (trackId: string, file: File) => {
-    const logo = await prepareLogoForUpload(file);
+    let logo;
+    try {
+      logo = await prepareLogoForUpload(file);
+    } catch {
+      toast.error("Couldn't read that image. Try a different file.");
+      return null;
+    }
     if (logo.byteLength > MAX_LOGO_BYTES) {
       toast.error("Logo is still too large after compression.");
       return null;