silence popups during automatic updates

add a timestamp item to the menu for last-synced timestamp

main.lua

···
 			},
 			{
 				text_func = function()
+					local doc_path = self:getCurrentDocumentPath()
+					if
+						doc_path
+						and self.document_mappings[doc_path]
+						and self.document_mappings[doc_path].last_sync_time
+					then
+						local mapping = self.document_mappings[doc_path]
+						local time_diff = os.time() - mapping.last_sync_time
+						local time_str
+						if time_diff < 60 then
+							time_str = _("Just now")
+						elseif time_diff < 3600 then
+							local mins = math.floor(time_diff / 60)
+							time_str = T(_("%1 min ago"), mins)
+						elseif time_diff < 86400 then
+							local hours = math.floor(time_diff / 3600)
+							time_str = T(_("%1 hr ago"), hours)
+						else
+							local days = math.floor(time_diff / 86400)
+							time_str = T(_("%1 days ago"), days)
+						end
+						return T(_("Last synced: %1% (%2)"), mapping.last_sync_percent, time_str)
+					else
+						return _("Last synced: Never")
+					end
+				end,
+				enabled = false,
+			},
+			{
+				text_func = function()
 					if self.auto_sync_enabled then
 						return _("Auto-sync: Enabled")
 					else
···
 	end
 end
 
-function Paperbnd:syncProgress()
+function Paperbnd:syncProgress(use_notification)
 	if not self:isAuthenticated() then
 		return
 	end
···
 		return
 	end
 
-	UIManager:show(InfoMessage:new({
-		text = T(_("Synced: %1% (%2/%3)"), percent, current_page, pages),
-		timeout = 2,
-	}))
+	-- Record last sync info for status display (per-document)
+	self.document_mappings[doc_path].last_sync_time = os.time()
+	self.document_mappings[doc_path].last_sync_percent = percent
+	self:saveSettings()
+
+	-- Show success notification (silent for auto-sync)
+	if not use_notification then
+		-- Use InfoMessage for manual sync and document close
+		UIManager:show(InfoMessage:new({
+			text = T(_("Synced: %1% (%2/%3)"), percent, current_page, pages),
+			timeout = 2,
+		}))
+	end
+	-- Auto-sync is completely silent (use_notification = true)
 end
 
 function Paperbnd:scheduleDebouncedSync(pageno)
···
 		return
 	end
 
-	-- Perform sync (reuses existing logic)
-	self:syncProgress()
+	-- Perform sync with notification (less intrusive for auto-sync)
+	self:syncProgress(true)
 
 	-- Track synced page
 	self.last_synced_page = pageno