feat(desktop): send minted agent cards to recipients via normal DM share path

Closes the v1 scope gap Wren flagged: the mint dialog only offered Save.
Card preview now includes PersonaShareRecipients + a Send action that
routes through useSnapshotSendController — the exact guarded
encode → upload (uploadMediaBytes) → send pipeline agent snapshots use,
with the same eligibility checkpoints and DM-safety gating. No
card-special relay path, per the kickoff contract.

Co-authored-by: Tyler Longwell <tlongwell@block.xyz>
Signed-off-by: Tyler Longwell <tlongwell@block.xyz>

desktop/src/features/agents/ui/AgentCardMintDialog.tsx

@@ -1,14 +1,19 @@
 import * as React from "react";
-import { Download, RefreshCw, Sparkles } from "lucide-react";
+import { Download, RefreshCw, Send, Sparkles } from "lucide-react";
 import { useMutation } from "@tanstack/react-query";
 import { toast } from "sonner";
 
+import {
+  useOpenDmMutation,
+  useUpsertCachedChannel,
+} from "@/features/channels/hooks";
 import {
   mintAgentCard,
   NO_OPENAI_KEY_PREFIX,
   saveAgentCard,
   type MintedAgentCard,
 } from "@/shared/api/tauriPersonas";
+import type { UserSearchResult } from "@/shared/api/types";
 import { Button } from "@/shared/ui/button";
 import {
   Dialog,
@@ -19,6 +24,14 @@ import {
 } from "@/shared/ui/dialog";
 import { Textarea } from "@/shared/ui/textarea";
 
+import { PersonaShareRecipients } from "./PersonaShareRecipients";
+import { useSnapshotSendController } from "./useSnapshotSendController";
+
+/** Decode base64 card bytes into the number[] shape the upload path expects. */
+function cardBytesFromBase64(b64: string): number[] {
+  return Array.from(atob(b64), (char) => char.charCodeAt(0));
+}
+
 /**
  * Mint-a-trading-card dialog: optional style notes → one long Rust-side
  * Responses API call → preview with reroll → save as `.agent.png`.
@@ -39,6 +52,11 @@ export function AgentCardMintDialog({
 }) {
   const [styleNotes, setStyleNotes] = React.useState("");
   const [card, setCard] = React.useState<MintedAgentCard | null>(null);
+  const [recipients, setRecipients] = React.useState<UserSearchResult[]>([]);
+
+  const sendController = useSnapshotSendController(card !== null);
+  const openDmMutation = useOpenDmMutation();
+  const upsertCachedChannel = useUpsertCachedChannel();
 
   const mintMutation = useMutation({
     mutationFn: () => mintAgentCard(agentId, styleNotes.trim() || undefined),
@@ -69,9 +87,38 @@ export function AgentCardMintDialog({
   });
 
   const isMinting = mintMutation.isPending;
+  const isSending =
+    sendController.state.phase !== "idle" &&
+    sendController.state.phase !== "done" &&
+    sendController.state.phase !== "error";
+  const isBusy = isMinting || saveMutation.isPending || isSending;
+
+  async function sendToRecipients(minted: MintedAgentCard) {
+    if (recipients.length === 0) return;
+    const sent = await sendController.beginSend(
+      async () => ({
+        fileBytes: cardBytesFromBase64(minted.cardPngBase64),
+        fileName: minted.fileName,
+      }),
+      async () => {
+        const directMessage = await openDmMutation.mutateAsync({
+          pubkeys: recipients.map((recipient) => recipient.pubkey),
+        });
+        await upsertCachedChannel(directMessage);
+        return directMessage.id;
+      },
+      agentName,
+    );
+    if (sent) {
+      toast.success(`Sent ${agentName}'s card.`);
+      onOpenChange(false);
+    } else if (sent === false) {
+      toast.error("Couldn’t send the card. Try again.");
+    }
+  }
 
   return (
-    <Dialog onOpenChange={(open) => !isMinting && onOpenChange(open)} open>
+    <Dialog onOpenChange={(open) => !isBusy && onOpenChange(open)} open>
       <DialogContent className="max-w-md" data-testid="agent-card-mint-dialog">
         <DialogHeader>
           <DialogTitle className="flex items-center gap-2">
@@ -93,9 +140,21 @@ export function AgentCardMintDialog({
               data-testid="agent-card-preview"
               src={`data:image/png;base64,${card.cardPngBase64}`}
             />
+            <PersonaShareRecipients
+              disabled={isBusy || !sendController.isDmSafetyReady}
+              excludedPubkeys={
+                sendController.relaySelfPubkey
+                  ? [sendController.relaySelfPubkey]
+                  : []
+              }
+              onSelectionChange={setRecipients}
+              open
+              selectedUsers={recipients}
+              testIdPrefix="agent-card-share"
+            />
             <div className="flex justify-end gap-2">
               <Button
-                disabled={isMinting || saveMutation.isPending}
+                disabled={isBusy}
                 onClick={() => mintMutation.mutate()}
                 variant="outline"
               >
@@ -103,13 +162,24 @@ export function AgentCardMintDialog({
                 {isMinting ? "Rerolling…" : "Reroll"}
               </Button>
               <Button
-                disabled={isMinting || saveMutation.isPending}
+                disabled={isBusy}
                 onClick={() => saveMutation.mutate(card)}
                 data-testid="agent-card-save"
+                variant={recipients.length > 0 ? "outline" : "default"}
               >
                 <Download className="mr-2 h-4 w-4" />
                 Save card
               </Button>
+              {recipients.length > 0 ? (
+                <Button
+                  disabled={isBusy}
+                  onClick={() => void sendToRecipients(card)}
+                  data-testid="agent-card-send"
+                >
+                  <Send className="mr-2 h-4 w-4" />
+                  {isSending ? "Sending…" : "Send"}
+                </Button>
+              ) : null}
             </div>
           </div>
         ) : (