feat: add clipboard paste file support (#65)

src/lib/components/InputBar.svelte

@@ -441,6 +441,44 @@ User: ${formattedMessage}`;
     }
   }
 
+  function handlePaste(event: ClipboardEvent) {
+    const items = event.clipboardData?.items;
+    if (!items) return;
+
+    for (const item of items) {
+      // Check if the item is a file (image or other)
+      if (item.kind === "file") {
+        const file = item.getAsFile();
+        if (!file) continue;
+
+        // Prevent default for file pastes so we handle it
+        event.preventDefault();
+
+        const filename = file.name || `pasted-${Date.now()}.${file.type.split("/")[1] || "png"}`;
+        const extension = filename.split(".").pop()?.toLowerCase() || "";
+        const fileType = getFileTypeFromExtension(extension);
+
+        // Create preview URL for images
+        let previewUrl: string | undefined;
+        if (fileType === "image" || file.type.startsWith("image/")) {
+          previewUrl = URL.createObjectURL(file);
+        }
+
+        const attachment: Attachment = {
+          id: `attachment-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`,
+          filename,
+          path: filename,
+          size: file.size,
+          type: file.type.startsWith("image/") ? "image" : fileType,
+          mimeType: file.type,
+          previewUrl,
+        };
+
+        claudeStore.addAttachment(attachment);
+      }
+    }
+  }
+
   function handleKeyDown(event: KeyboardEvent) {
     // Handle command menu navigation
     if (showCommandMenu && matchingCommands.length > 0) {
@@ -532,6 +570,7 @@ User: ${formattedMessage}`;
         bind:value={inputValue}
         onkeydown={handleKeyDown}
         oninput={handleInputChange}
+        onpaste={handlePaste}
         placeholder={isConnected
           ? "Ask Hikari anything... (type / for commands)"
           : "Connect to Claude first..."}