name pasted image data

src/chat/components/MessageInput.svelte

@@ -38,7 +38,15 @@
           const buffer = await file.arrayBuffer();
           const data = new Uint8Array(buffer);
           const previewUrl = URL.createObjectURL(new Blob([data], { type: file.type }));
-          stagedImages.push({ data, mimeType: file.type, previewUrl, name: file.name });
+          
+          let fileName = file.name || "image.png";
+          if (fileName === "image.png" || fileName === "blob") {
+            const now = new Date();
+            const dateStr = now.toISOString().split(".")[0].replace(/[T:]/g, "-");
+            fileName = `pasted-image-${dateStr}.webp`;
+          }
+
+          stagedImages.push({ data, mimeType: file.type, previewUrl, name: fileName });
         }
       }
     }

src/chat/components/ThreadMessageInput.svelte

@@ -37,7 +37,15 @@
           const buffer = await file.arrayBuffer();
           const data = new Uint8Array(buffer);
           const previewUrl = URL.createObjectURL(new Blob([data], { type: file.type }));
-          stagedImages.push({ data, mimeType: file.type, previewUrl, name: file.name });
+          
+          let fileName = file.name || "image.png";
+          if (fileName === "image.png" || fileName === "blob") {
+            const now = new Date();
+            const dateStr = now.toISOString().split(".")[0].replace(/[T:]/g, "-");
+            fileName = `pasted-image-${dateStr}.webp`;
+          }
+
+          stagedImages.push({ data, mimeType: file.type, previewUrl, name: fileName });
         }
       }
     }

src/chat/utils.ts

@@ -59,10 +59,22 @@ export const optimizeImage = async (
               return;
             }
             const buffer = await blob.arrayBuffer();
+
+            let fileName = file.name || "image.png";
+            // If the name is generic (like from clipboard), use a timestamp
+            if (fileName === "image.png" || fileName === "blob") {
+              const now = new Date();
+              const dateStr = now.toISOString().split(".")[0].replace(/[T:]/g, "-");
+              fileName = `pasted-image-${dateStr}.webp`;
+            } else {
+              // Replace extension with .webp
+              fileName = fileName.replace(/\.[^/.]+$/, "") + ".webp";
+            }
+
             resolve({
               data: new Uint8Array(buffer),
               mimeType: "image/webp",
-              name: file.name,
+              name: fileName,
             });
           },
           "image/webp",