feat: Add communikey blossom servers to upload dialog

Integrates communikey blossom servers into the file upload dialog,
allowing users to upload attachments to blossom servers specified in
the communikey's kind 10222 configuration.

Changes:
- Added communikeyServers prop to BlossomUploadDialog component
- Updated server loading logic to merge user servers with communikey
  servers, removing duplicates
- If user has no server list, communikey servers are used instead of
  falling back to public servers immediately
- Added communikeyServers option to useBlossomUpload hook
- ChatViewer extracts blossom servers from communikey metadata and
  passes them to the upload hook

Users can now upload to:
1. Their own servers (kind 10063)
2. Communikey blossom servers (from kind 10222)
3. Public fallback servers (if no other options)

The servers are merged and deduplicated, with all available servers
selected by default for redundancy.

src/components/BlossomUploadDialog.tsx

@@ -57,6 +57,8 @@ interface BlossomUploadDialogProps {
   onError?: (error: Error) => void;
   /** File types to accept (e.g., "image/*,video/*,audio/*") */
   accept?: string;
+  /** Additional blossom servers from communikey (NIP-CC) */
+  communikeyServers?: string[];
 }
 
 /**
@@ -75,6 +77,7 @@ export function BlossomUploadDialog({
   onCancel,
   onError,
   accept = "image/*,video/*,audio/*",
+  communikeyServers = [],
 }: BlossomUploadDialogProps) {
   const eventStore = useEventStore();
   const activeAccount = use$(accountManager.active$);
@@ -134,18 +137,34 @@ export function BlossomUploadDialog({
     let subscription: Subscription | null = null;
     let foundUserServers = false;
 
+    // Helper to merge user servers with communikey servers
+    const mergeServers = (userServers: string[]) => {
+      // Combine user servers + communikey servers, removing duplicates
+      const allServers = [...new Set([...userServers, ...communikeyServers])];
+      return allServers;
+    };
+
     // Check existing event first
     const event = eventStore.getReplaceable(USER_SERVER_LIST_KIND, pubkey, "");
     if (event) {
-      const s = getServersFromEvent(event);
-      if (s.length > 0) {
-        setServers(s);
-        setSelectedServers(new Set(s)); // Select all by default
+      const userServers = getServersFromEvent(event);
+      if (userServers.length > 0) {
+        const allServers = mergeServers(userServers);
+        setServers(allServers);
+        setSelectedServers(new Set(allServers)); // Select all by default
         setLoadingServers(false);
         foundUserServers = true;
       }
     }
 
+    // If we have communikey servers but no user servers yet, use them
+    if (!foundUserServers && communikeyServers.length > 0) {
+      setServers(communikeyServers);
+      setSelectedServers(new Set(communikeyServers));
+      setLoadingServers(false);
+      setUsingFallback(false);
+    }
+
     // Also fetch from network
     subscription = addressLoader({
       kind: USER_SERVER_LIST_KIND,
@@ -155,10 +174,13 @@ export function BlossomUploadDialog({
       next: () => {
         const e = eventStore.getReplaceable(USER_SERVER_LIST_KIND, pubkey, "");
         if (e) {
-          const s = getServersFromEvent(e);
-          if (s.length > 0) {
-            setServers(s);
-            setSelectedServers((prev) => (prev.size === 0 ? new Set(s) : prev));
+          const userServers = getServersFromEvent(e);
+          if (userServers.length > 0) {
+            const allServers = mergeServers(userServers);
+            setServers(allServers);
+            setSelectedServers((prev) =>
+              prev.size === 0 ? new Set(allServers) : prev,
+            );
             setUsingFallback(false);
             foundUserServers = true;
           }
@@ -171,7 +193,7 @@ export function BlossomUploadDialog({
     // After timeout, use fallbacks if no user servers found
     const timeout = setTimeout(() => {
       setLoadingServers(false);
-      if (!foundUserServers) {
+      if (!foundUserServers && communikeyServers.length === 0) {
         applyFallbackServers();
       }
     }, 3000);
@@ -180,7 +202,7 @@ export function BlossomUploadDialog({
       subscription?.unsubscribe();
       clearTimeout(timeout);
     };
-  }, [open, pubkey, eventStore, applyFallbackServers]);
+  }, [open, pubkey, eventStore, applyFallbackServers, communikeyServers]);
 
   // Create preview URL for selected file
   useEffect(() => {

src/components/ChatViewer.tsx

@@ -446,9 +446,24 @@ export function ChatViewer({
   // Ref to MentionEditor for programmatic submission
   const editorRef = useRef<MentionEditorHandle>(null);
 
+  // Extract communikey blossom servers if available
+  const communikeyServers = useMemo(() => {
+    if (
+      conversationResult.status === "success" &&
+      conversationResult.conversation.protocol === "communikeys"
+    ) {
+      return (
+        conversationResult.conversation.metadata?.communikeyConfig
+          ?.blossomServers || []
+      );
+    }
+    return [];
+  }, [conversationResult]);
+
   // Blossom upload hook for file attachments
   const { open: openUpload, dialog: uploadDialog } = useBlossomUpload({
     accept: "image/*,video/*,audio/*",
+    communikeyServers,
     onSuccess: (results) => {
       if (results.length > 0 && editorRef.current) {
         // Insert the first successful upload as a blob attachment with metadata

src/hooks/useBlossomUpload.tsx

@@ -11,6 +11,8 @@ export interface UseBlossomUploadOptions {
   onError?: (error: Error) => void;
   /** File types to accept (e.g., "image/*,video/*,audio/*") */
   accept?: string;
+  /** Additional blossom servers from communikey (NIP-CC) */
+  communikeyServers?: string[];
 }
 
 export interface UseBlossomUploadReturn {
@@ -84,9 +86,17 @@ export function useBlossomUpload(
         onCancel={handleCancel}
         onError={handleError}
         accept={options.accept}
+        communikeyServers={options.communikeyServers}
       />
     ),
-    [isOpen, handleSuccess, handleCancel, handleError, options.accept],
+    [
+      isOpen,
+      handleSuccess,
+      handleCancel,
+      handleError,
+      options.accept,
+      options.communikeyServers,
+    ],
   );
 
   return { open, close, isOpen, dialog };