fix: bot send confirmation, preview picker dialog nesting, upload button

- Bot: wait for updateMessageSendSucceeded/Failed before marking send
  complete (was returning on temp message, actual send was async)
- Preview picker: move ArchivePreviewPicker outside parent Dialog to
  fix Radix nested dialog focus trap conflict
- Upload: add explicit "Upload Preview" button always visible in the
  action bar alongside "Pick Preview"

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

bot/src/tdlib/client.ts

@@ -73,6 +73,11 @@ export async function closeBotClient(): Promise<void> {
  *
  * The fromChatId is the Telegram chat ID from the DB (e.g. -1003767441152).
  * The messageId is the TDLib message ID stored in the DB.
+ *
+ * IMPORTANT: forwardMessages with send_copy returns a *temporary* message
+ * synchronously. The actual file copy/send is asynchronous inside TDLib.
+ * We must listen for updateMessageSendSucceeded / updateMessageSendFailed
+ * to know whether the message actually reached the user.
  */
 export async function copyMessageToUser(
   fromChatId: bigint,
@@ -94,7 +99,73 @@ export async function copyMessageToUser(
     log.warn({ err, chatId: fromChatId.toString() }, "getChat failed for source channel");
   }
 
-  const result = await withFloodWait(
+  // Wait for the actual send to complete, not just the temporary message.
+  // Pattern mirrors worker/src/upload/channel.ts sendAndWaitForUpload.
+  await new Promise<void>((resolve, reject) => {
+    let settled = false;
+    let tempMsgId: number | null = null;
+
+    // Timeout: 5 minutes for the copy to complete
+    const TIMEOUT_MS = 5 * 60_000;
+    const timer = setTimeout(() => {
+      if (!settled) {
+        settled = true;
+        cleanup();
+        reject(
+          new Error(
+            `copyMessageToUser timed out after ${TIMEOUT_MS / 60_000}min ` +
+            `(from=${fromChatId}, msg=${messageId}, to=${toUserId})`
+          )
+        );
+      }
+    }, TIMEOUT_MS);
+
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    const handleUpdate = (update: any) => {
+      if (update?._ === "updateMessageSendSucceeded") {
+        const oldMsgId = update.old_message_id;
+        if (tempMsgId !== null && oldMsgId === tempMsgId) {
+          if (!settled) {
+            settled = true;
+            cleanup();
+            const finalId = update.message?.id;
+            log.info(
+              { tempMsgId, finalMsgId: finalId, toUserId: toUserId.toString() },
+              "Message copy confirmed by Telegram"
+            );
+            resolve();
+          }
+        }
+      }
+
+      if (update?._ === "updateMessageSendFailed") {
+        const oldMsgId = update.old_message_id;
+        if (tempMsgId !== null && oldMsgId === tempMsgId) {
+          if (!settled) {
+            settled = true;
+            cleanup();
+            const errorMsg = update.error?.message ?? "Unknown send error";
+            const errorCode = update.error?.code ?? 0;
+            log.error(
+              { tempMsgId, errorCode, errorMsg, toUserId: toUserId.toString() },
+              "Message copy failed"
+            );
+            reject(new Error(`copyMessageToUser failed: [${errorCode}] ${errorMsg}`));
+          }
+        }
+      }
+    };
+
+    const cleanup = () => {
+      clearTimeout(timer);
+      c.off("update", handleUpdate);
+    };
+
+    // Attach listener BEFORE sending to avoid missing fast completions
+    c.on("update", handleUpdate);
+
+    // Send the copy — returns a temporary message immediately
+    withFloodWait(
       () =>
         c.invoke({
           _: "forwardMessages",
@@ -105,14 +176,37 @@ export async function copyMessageToUser(
           remove_caption: false,
         }),
       "copyMessageToUser"
+    )
+      .then((result) => {
+        // forwardMessages returns { messages: [tempMsg, ...] }
+        const messages = (result as { messages?: Array<{ id: number }> })?.messages;
+        if (messages && messages.length > 0 && messages[0]) {
+          tempMsgId = messages[0].id;
+          log.debug(
+            { tempMsgId, toUserId: toUserId.toString() },
+            "forwardMessages returned temp message, waiting for send confirmation"
           );
-
-  // forwardMessages returns immediately with temp messages — check result
-  const messages = (result as { messages?: unknown[] })?.messages;
-  log.info(
-    { messageCount: messages?.length ?? 0, result: JSON.stringify(result).slice(0, 500) },
-    "forwardMessages result"
+        } else {
+          // No temp message returned — likely an error in the API call itself
+          if (!settled) {
+            settled = true;
+            cleanup();
+            reject(
+              new Error(
+                `forwardMessages returned no messages (result: ${JSON.stringify(result).slice(0, 300)})`
+              )
             );
+          }
+        }
+      })
+      .catch((err) => {
+        if (!settled) {
+          settled = true;
+          cleanup();
+          reject(err);
+        }
+      });
+  });
 }
 
 /**

src/app/(app)/stls/_components/package-files-drawer.tsx

@@ -335,6 +335,7 @@ export function PackageFilesDrawer({ pkg, open, onOpenChange }: PackageFilesDraw
   }, [filtered]);
 
   return (
+    <>
     <Dialog open={open} onOpenChange={onOpenChange}>
       <DialogContent className="sm:max-w-2xl max-h-[80vh] flex flex-col gap-0 p-0">
         <DialogHeader className="px-6 pt-6 pb-4 border-b border-border space-y-3">
@@ -408,6 +409,20 @@ export function PackageFilesDrawer({ pkg, open, onOpenChange }: PackageFilesDraw
                       Pick Preview
                     </Button>
                   )}
+                  <Button
+                    variant="outline"
+                    size="sm"
+                    className="h-8 gap-1.5 text-xs"
+                    onClick={() => fileInputRef.current?.click()}
+                    disabled={uploading}
+                  >
+                    {uploading ? (
+                      <Loader2 className="h-3.5 w-3.5 animate-spin" />
+                    ) : (
+                      <Upload className="h-3.5 w-3.5" />
+                    )}
+                    Upload Preview
+                  </Button>
                 </div>
               )}
             </div>
@@ -512,7 +527,9 @@ export function PackageFilesDrawer({ pkg, open, onOpenChange }: PackageFilesDraw
         </ScrollArea>
       </DialogContent>
 
-      {/* Archive preview picker modal */}
+    </Dialog>
+
+    {/* Archive preview picker modal — rendered as sibling to avoid nested Dialog issues */}
     {pkg && pkg.archiveType !== "DOCUMENT" && !pkg.isMultipart && (
       <ArchivePreviewPicker
         packageId={pkg.id}
@@ -525,6 +542,6 @@ export function PackageFilesDrawer({ pkg, open, onOpenChange }: PackageFilesDraw
         }}
       />
     )}
-    </Dialog>
+    </>
   );
 }